air data test set mps-24 digital portable user manual
Contents
1. D MARCHIORI SRL AIR DATA TEST SET MPS 24 DIGITAL PORTABLE USER MANUAL ADDRESS VIA PONTINA KM 43 856 04011 APRILIA LT ITALY TEL 39 06 928 2733 FAX 39 06 927 5401 E mail dma grisnet it Internet http www ilink it DMA MPS 24 User s Manual INDEX 1 0 INTRODUCTION 2 0 GENERAL INFORMATION 3 0 MAIN PARTS 4 0 TECHNICAL DATA 4 1 AIR DATA FUNCTIONS FIG 4 1 MPS 24 AIR DATA TEST SET WITH EXTERNAL MULTIPLE ISOLATOR 4 2 ADDITIONAL FEATURES 4 3 ACCURACY 4 4 POWER SUPPLY REQUIREMENT 160 W MAXIMUM 4 5 INTERFACES 4 6 DIMENSIONS 4 7 ENVIRONMENTAL 4 8 CALIBRATION 4 9 SELF TEST TIME AT STARTUP 4 10 OPTIONS 4 11 COMMAND AND CONTROL 4 12 CONTROL CAPABILITY WITH INTERNAL PUMPS 4 13 PROTECTION TO AVOID DAMAGE TO THE INSTRUMENT FIG 4 2 LAY OUT OF HHRCU 4 14 PROTECTION AGAINST ELECTRICAL POWER LOSS 5 0 EQUIPMENT DESCRIPTION 5 1 FRONT PANEL FIG 5 1 MPS 24 FRONT PANEL 6 0 DESCRIPTION OF THE HHRCU 6 1 DISPLAY 6 2 KEYBOARD FIG 6 1 HHRCU DISPLAY IN OPERATIONAL MODE 7 0 STARTUP 8 0 OPERATION 8 1 ENTERING ALTITUDE AND AIRSPEED VALUES 8 2 ENTERING PRESSURE VALUES 8 3 CHANGING PRESET LIMITS WITH THE LIMITS MENU FIG 8 1 HHRCUIN LIMIT MENU 8 4 AMBIENT MEASUREMENT PAUSE MODE PANIC BUTTON FIG 8 2 HHRCU IN MEASURE MODE 8 5 LEAK TEST FIG 8 3 HHRCU IN LEAK MODE 8 6 VENT FUNCTION 8 7 ENGINE PRESSURE RATIO EPR FIG 8 4 HRCU IN EPR INPUT MODE FIG 8 5 HHRCUIN EPR CONTROL2. 7 0 STARTUP NOTE For correct operation the MPS 24 must be placed with the front panel face up The internal vibrating cylinders are slightly sensitive to gravity Operation with the front panel face up is required for precision readings Before switching ON the MPS 24 and connecting it to altitude and airspeed ports it must be at ambient pressure If the altitude in static line is gt 8000 feet press VENT Connect instruments only after TEST BENCH CAN BE DISCONNECTED appears Remember also to close completely the needle _valves _before starting the test For normal operation perform the following steps Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 14 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 1 Connect the static 9 and pitot 10 pneumatic lines to the relevant aircraft or instruments ports 2 Connect the HHRCU cable to connector 7 on the front panel If necessary use the provided 50 ft extension cable 3 Switch the power switch 1 to ON 4 After the start up button is pressed the MPS 24 Air Data Test Set begins its startup and self check routine This routine will take approximately 1 minute During this period the following information is displayed e Serial number of the ADTS e Embedded software issue e Running time in hours e Last calibration date After the self check routine is complete the MPS 24 will measure the ambient conditions
3. If the sealing is good proceed to the step C of the profile corresponding to point A of TABLE 1 From this point onward no difference exists between tables 1 and 2 Issue Nov 1998 CAUTION Both the Static and Pitot ports of the MPS24 must be connected to the aircraft If only the Airspeed Indicator has to be tested connect to it only the Pitot Port leaving the Static port of the MPS24 and the one of the Altimeter in ambient In this case set to ZERO the Altitude Rate to force the MPS24 to not control the Static Pressure NOTE 1 The waiting time to pass automatically to the next step is set to 90 sec This is done because the FAR establishes a stabilisation time for the altitude bigger than 60 sec and less than 10 min This allows 30 sec to the operator to read the datum D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced 31 lt xE lt ci vmOVvOZEZErF AC ToOmmMIDOo gt SB Issue Nov 1998 MPS 24 User s Manual NOTE 2 The Airspeed is set up to 100 Kts for every test point because the test is related to the static system Also ZERO Kts could be set up for the Airspeed with the exception of points A and B of TABLE 2 If the Airspeed indicator has to be checked different Airspeed data can be commanded The airspeed instrument is tested in a better way leaving the aircraft or the instrument static port in ambient thus leaving in ambient also the MPS24 static port
4. To return to the manual test press the F7 key again 13 4 Test Reporting From either test mode manual or automatic to memorize a particular value press F8 and insert the instrument under test reading the program will prompt the same values of the MPS 24 pressures The test result can be printed on a printer connected to the parallel port of the PC To print the memorized data when in the general MENU select the REVIEW function A new menu will appear where each memorized point can be reviewed and a print command can be sent These points can also be saved on the computer s hard disk or on a floppy disk The program automatically assigns the extension RPR to each test operation These files i e TEST1 RPR can be reviewed and printed when requested but only by using the program REPORT EXE This program may also be installed in another PC used to review and print the test reports After data is recorded and the Initial Setting of the General Menu is accessed collected data will be cleared and the test point counter reset to zero Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 40 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 14 0 CALIBRATION As delivered the MPS 24 has been calibrated with a very precise pressure standard and its precision is guaranteed within 4 ft s l for 1 year The following calibration procedure achieves the target accuracy if the f
5. pressing the Backspace key and retyping the letter number symbol To store the new name and profile use the F6 function When the name has been entered a gt will flash in front of the Alt value insert the first step of altitude or confirm the existing one using the GO ENTER key al The gt symbol will now flash in front of Asp value insert the Airspeed that must be simulated at that point or confirm it by pressing GO Continue inserting the Altitude rate and Airspeed Rate values At this point the gt symbol flashes in front of Wait The value to be entered corresponds to the period of time in seconds that the MPS 24 will wait before passing automatically to the next step If 0 zero value is entered the MPS 24 will not pass to the next step unless the A up arrow is pressed note that also if a value is inserted it is always possible to pass to the next step by pressing A or to the previous by pressing the W key After the wait time has been set up the gt flashes in front of LO this corresponds to the stabilization time for the leak check i e the time in seconds to stabilize the pressure before the leak is measured If zero value is inserted the MPS 24 will not perform the stabilization time for the leak check When the stabilization time has been set up the gt flashes in front of L1 this is the measuring time for the leak check i e the time in seconds to measure the leakage If Zero valu
6. kt m p h and km h Center line correction To input the altitude difference between the test set and unit under test UUT Programmability of the test The tests can be made manually by typing the desired altitude airspeed and vertical speed values with the keyboard or in two other ways with pre defined steps or with 25 complete preset test profiles Vacuum generation May be used to fasten special adapters with suckers to the aircraft Limit values at startup The ADTS is easily programmable for limit not to exceed values of the altitude speed vertical speed Mach number and speed ratio The MPS 24 is delivered with the following preset values from the factory Minimum altitude 1 500 ft Maximum altitude 50 000 ft Maximum airspeed 450 kt Maximum vertical speed 6 000 ft min V t IAS ratio 300 kt min Max Mach no 1 The user can change these values The test set can be furnished upon request with different default values Units of measurement at startup feet knots inHg Automatic Protection Against excessive leakage in Pitot line running also with large Pitot volumes 4 3 Accuracy Altitude Range 2 000 to 85 000 ft with the internal compressor vacuum pump Measuring accuracy 3 ft sea level with reference to the primary standard Resolution 1 ft Generated signal stability 3 ft 20 000 ft without leakage Vertical speed Range 0 to 30 000 ft min the
7. suitable for laboratory operation and to record the test connecting cable P N 24 S PC3 supplied Two versions for DOS and Windows95 are available JEEE 488 interface 4 11 Command and Control The lightweight 12 oz HHRCU has 32 low profile keys and a backlit LCD display with three menus as shown in Figure 4 1 The first menu is the operational one which shows the target values and the actual ones plus the units of measurement The second menu is used to set the maximum and minimum parameters according to the system under test to set the speed indicated air speed IAS variation and to define the steps AL AS and AR to be used during the test Another menu is used to insert the values of the preset test profiles The beep notifies the operator of the achievement of the target values 4 12 Control Capability with Internal Pumps The control capability is optimized for the following loads for special requirements the MPS 24 can be easily modified for larger volumes Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 7 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A e Static line With 500 cu in 8 2 liters the vertical speed can be controlled at 6 000 ft min up to 50 000 ft e Pitot line The maximum limit speed can be stabilized with a volume of 200 cu in 3 28 liters 4 13 Protection to Avoid Damage to the Instrument e Hardware Intrinsically safe
8. 0 Q 22000 100 3000 300 90 0 0 R 25000 100 3000 300 90 0 0 S 30000 100 3000 300 90 0 0 T 35000 100 3000 300 90 0 0 U 40000 100 3000 300 90 0 0 V 45000 100 3000 300 90 0 0 W 50000 100 3000 300 90 0 0 TABLE 1 To run a correct test profile the Unit Under Test UUT must be tested before for leakage both for the static and for the Pitot lines Leakage check can be programmed also from inside the above programmed test profile If the leak check must be performed within the same test profile TABLE 1 changes in TABLE 2 at next page to_exclude the static pressure control it is necessary to enter the Altitude rate zero In this table the two steps A amp B are related to the leakage of the static and the pitot line As described at previous pages of this manual the measured leakage is shown on the HHRCU as RA for the static and RS for the Pitot Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 30 This material not to be disclosed or reproduced The end of the first point gives the RS value the value of RA does not have significance if it is bigger than the allowed value the test must be stopped and the system must be troubleshot MPS 24 User s Manual DMM 0722 CP Rev A If there is a good sealing proceed to the step 2 of the profile In this case too the value of RS does not have significance If the leakage is bigger than the allowed value the test must be stopped and the system must be troubleshot
9. HHRCU splash and rain sealed Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 6 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 4 8 Calibration Completely performed via internal software through the HHRCU keyboard first level calibration Recoverable error for static and pitot pressure Without any limitation it is advisable to send the test set to the manufacturer for an error bigger than 2 mbar Self reconditioning of the control valves is accomplished via internal software when required to regulate the control parameters of the flow regulators This operation may be required after long running periods of the test set to re adapt the software control parameters to the aging of the pressure control valves 4 9 Self Test Time at Startup Automatic self test is initiated at power on The MPS 24 is ready for operation in about 60 seconds after power on 4 10 Options Low voltage power supply section 22 30 V dc Multiple isolator External separation box pneumatically sealed to directly perform from the control unit leakage tests on four separate static and four separate pitot lines without repositioning the pipes or hoses or Internal box with similar functions Readout of the binary code generated by the encoding altimeters Software package to connect the ADTS to a PC AT compatible computer to perform special test profiles and to record and print the test results
10. Press the GO RETURN key until the operative menu re appears Now the pressures indicated by the static and the pitot transducers have to be equal To save the new calibration data in memory press the MEM key twice At the next startup the MPS 24 shows the new calibration date after its serial number and the software issue After the MPS 24 has been calibrated it is convenient to make a quick check at some points for example 0 25 000 50 000 ft inputting AS 0 zero The difference between the Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 42 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A static and pitot pressures at static conditions inputting AR 0 should never exceed 0 004 inHg 15 0 USE OF AN EXTERNAL VACUUM PUMP If the altitude slew rates or the maximum altitude that can be obtained with the internal pumps are insufficient an external vacuum pump can be used Connect the external pump trough the vacuum port Fig 2 No 5 16 0 429 BUS DATA DISPLAY ARINC OPTION Starting from 5 24 software version it s possible to have the 429 Bus Data Display ARINC Option in the MPS 24 This option consists of a dedicated electronic card inserted into apparatus and two BNC plugs placed on front panel To activate the ARINC Option connect the MPS 24 to the aircraft through the BNC connector High and Low After connection push the Fe key 5 on the HHRCU On f
11. do it leaving the pumps installed on the MPS 24 Sometimes it happens that foreign particles obstructs or cause the valves not to perfectly close thus bringing to a bad efficiency of the pumps Gain access to the pumps by removing the crate as described at para 16 1 Carefully remove the nuts of the valves with a 2 5 mm Allen Wrench taking care to not miss the little internal spring and plastic valve The red valve body has a spring with a teflon mobile part the grey valve body does not have a spring and has a polyurethane mobile part Use a commercial ear cleaner cotton bud wetted in alcohol to clean up the valve hole and the mobile parts Carefully reassemble the valves in the reverse order they have been disassembled Reassemble the teflon valve and its spring inside the red body the same way it was installed taking care to the direction of the internal mobile part reassemble the polyurethane mobile part inside the grey valve inserting the smooth part facing the pump If the membrane and the valves parts are damaged DMA supplies an inexpensive pumps overhaul kit part No Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 45 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A In any case it is suggested to attend the maintenance and calibration training course that DMA always offers free of charge with every purchase of the MPS 24 Issue Nov 1998 D Marchiori PROPRIE
12. most aircraft instrumentation The operator should use extreme care and caution in setting limits outside of normal operation ranges and when operating the MPS 24 under these limits Damage to the units under test could occur if caution is not observed The preset limits will be set as follows e ALMx is the maximum allowed altitude e ALM1 is the minimum allowed altitude e ASMx is the maximum allowed airspeed e MaMx is the maximum allowed Mach number e ARMx is the maximum allowed altitude rate e AS m is the imposed variation of the airspeed e DA is the default step interval in feet used for the stepping function e DS is the default step interval in knots used for the stepping function e DR is the default step interval in ft min used for the altitude rate function To exit from the Limits Menu and to return to the Operation Menu press the MENU key again Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 17 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 8 3 1 Access to the Limits Menu To gain access to the Limits menu press the MENU key once The LCD will display the preset limits in the display as shown in Figure 8 1 8 3 2 Changing Values in the Limits Menu Once in the Limits Menu to change the limits and the step values press the SET key A gt symbol will appear in front of the value to indicate the limit to be changed ALMx To change its value insert with t
13. or reproduced MPS 24 User s Manual DMM 0722 CP Rev A Press the GO RETURN key repeatedly until the operative menu appears At about 50 000 ft the two transducer values must be equal to the calibrator value If this does not ce 99 happen repeat the zero correction taking particular attention to the or values of the differences 14 2 Gain Correction Return to the ambient pressure and vent the static line the pitot line and the pressure calibrator at the ambient pressure When the readings are stable take note of the three values calibrator pressure MPS 24 static pressure Ps MPS 24 pitot pressure Pt Assume the calibrator pressure as the true pressure Re enter the Fine Tuning Function by pressing the Fz key Insert the code word 0099 and pressing the GO RETURN key adjust the various parameters until GAINS Static Gain appears Divide the pressure value of the calibrator by the MPS 24 static pressure and multiply the number obtained by the GAINS value indicated by the MPS 24 Insert the result of this operation as the new static gain New GAINS True Pressure Read Ps x Old GAINS Press the GO RETURN key twice until the script GAINP appears Divide the pressure value of the calibrator by the MPS 24 pitot pressure and multiply the number obtained by the GAINP value indicated by the MPS 24 Insert the result of this operation as the new pitot gain New GAINP True Pressure Read Pt x Old GAINP
14. s Manual DMM 0722 CP Rev A MPS 24 PORTABLE DIGITAL AIR DATA TEST SET USER S MANUAL 1 0 INTRODUCTION The procedures for using and calibrating the MPS 24 Portable Digital Air Data Test Set ADTS manufactured by D Marchiori s r l Italy are contained in this manual 2 0 GENERAL INFORMATION The MPS 24 is a portable test set ideal for measuring and controlling the pressures related to altitude and airspeed and their rates of change These values may be displayed in air data units or engineering units The MPS 24 is remotely controlled with a lightweight sealed shockproof control unit with a 20 m extension cable The control unit to be carried aboard the aircraft is resistant to shocks received during a free fall of 2 m and is shielded against electromagnetic interference EMI according to FCC Class A Part 15 3 0 MAIN PARTS The MPS 24 shown in Figure 3 1 can be logically divided into six operating subsystems e Static pneumatic circuitry e Pitot pneumatic circuitry e Internal compressor vacuum generators e Microprocessor and electronics to read and control the pressures e Vibrating cylinders and very accurate pressure transducers to measure pressures e Hand held remote control unit HHRCU to control functions and display the parameters 4 0 TECHNICAL DATA 4 1 Air Data Functions The MPS 24 generates the following air data test outputs e Altitude in various units e Static pressure in various units Issue N
15. static one To perform this function follow this procedure vent the MPS 24 at ambient pressure when vented leave the airspeed at zero kts and put the altitude rate AR to zero ft min use a quick disconnect fitting open to ambient to put an maintain the static pressure port at ambient pressure operate the F5 function key this will fully equalize the total pressure as the static one thus permitting the generation and measurement of very low airspeed after some seconds the total pressure will be exactly equal to the static one the pressures readings will have a resolution of four decimal points when in in Hg and it will be possible to read airspeed from 2 two kt The readings have no decimal points from 2 to 20 kt i e 4 kt from 20 kt to the Max allowed AS the readings have one decimal point i e 22 4 kt When very low airspeed must be generated it is suggested to leave the static port open to ambient with altitude rate AR regulated at zero and connect only pitot port at pitot UUT unit under test port To exit this function operate the Fg key 8 12 Control Loss Function The Control Loss function has been added from the software version 5 13 This function shuts off the pressure control when the volume is too high to be emptied or filled up at the desired rate this fact usually happens when the ADTS is not connected to any closed volume and its hosed are left opened in am
16. value using the keypad After entering the desired value press the RETURN GO key The desired altitude is now entered in the MPS 24 but it will not be reached until an altitude rate greater than 0 is entered To add an altitude rate value press the AR key then enter the numbers of the desired altitude rate with the keypad followed by pressing the RETURN GO key To enter an exact airspeed press the AS key followed by the desired airspeed in knots then press the RETURN GO key When the airspeed value is entered the MPS 24 will set off toward the target values 8 1 2 Stepping by Using Arrow Keys This method is a quick method for setting altitude and rate parameters using pre determined altitude steps and the UP ARROW or the DOWN ARROW keys The step can be programmed with custom step values or factory preset default values can be used To step the target altitude press the UP DOWN ARROW AL key followed by the UP ARROW key if the altitude must be increased or by the DOWN ARROW key if the altitude value must be decreased To change the altitude rate by stepping press the UP DOWN ARROW AR key followed by the UP ARROW or the DOWN ARROW to increase or decrease the desired setting To change the airspeed by stepping press the UP DOWN ARROW AS key followed by the UP ARROW or the DOWN ARROW to increase or decrease the desired setting For all functions holding the UP ARROW or the DOWN ARROW key will result in a continuous increase
17. Connector Fig 12 3 MPS 24 Front Panel with internal multiple isolator It doesn t need any connector for the Electric Insulation Box All four static lines and four pitot lines are positioned on front panel Use the HHRCU keyboard as in the previous configuration remembering that during normal function the valves are normally open Connect the required static and pitot output to the static and pitot lines of the aircraft and leave the unused lines closed The functioning is similar FI activates the multiple isolator in Leak Mode FH activates the in MEAS Mode Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 35 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A Pressing the numbers 1 4 close and open the static valves pressing numbers 5 8 close and open the pitot valves 6699 In the lower line of the display indicates valve open x indicates valve closed 66__99 The position starting from the left of the or the x shows the condition of the relevant valve Alternatively pressing the same number opens and closes the same valve Pressing 0 will open all the valves Pressing 9 will close all the valves Pressing the RETURN GO key to resume normal mode all valves open 13 0 CONTROLLING MPS 24 WITH A PC OPTION The MPS 24PC software package permits controlling the MPS 24 with a personal computer A PC with this software can be used in lieu of t
18. LEAK RESUME key again to reset the clock after transition numbers have stabilized for aclean start of the leak test NOTE It may take up to 30 seconds for the measured value to stabilize To return to the prior menu press the RED SHIFT key on the lower right of the keyboard followed by the LEAK RESUME key this resumes the prior condition with action of the red RESUME function of the LEAK RESUME key ALTITUDE AIRSPEED sec ALTRate ASPRate 10 STS 0 6 1543 769 3 1 021 0 174 Ft Kt hP Pt Ps MACH UNITS HHRCU in LEAK mode Figure 8 3 HHRCU in Leak Mode 8 6 VENT Function The VENT function is used to restore the test circuit to ambient pressure for safe disconnection of the adapters from the aircraft or from the unit under test Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 21 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A After the VENT key is pressed from an altitude higher than 10 000 ft the MPS 24 automatically initiates a dive rate of 3 000 ft min imposes an altitude of 10 000 ft and sets the airspeed to zero When an altitude of 10 000 ft is reached or if VENT is pressed from an altitude lower than 10 000 ft the MPS 24 measures the ambient pressure and puts the target value of the static line at the ambient pressure When the proper conditions to disconnect the hoses are reached the legend TEST SET CAN BE DISCONNECTED is displayed To start a new t
19. MODE 8 8 MACH NUMBER 8 9 CENTER LINE CORRECTION 8 10 TRUE AIRSPEED 8 11 VERY LOW AIRSPEED CONTROL 8 12 CONTROL LOSS FUNCTION Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced DMM 0722 CP Rev A w w ODOC NN NNN AAADCDUA RAU W a p PRR WN rR j mn 9 PROGRAMMING MPS 24 MPS 24 User s Manual FIG 9 1 HHRCU IN PROGRAM INPUT MODE FIG 9 2 HHRCU RUNNING IN PROGRAM MODE 9 1 EXAMPLE PROGRAMMING THE MPS 24 ACCORDING THE FAR 43 APPENDIX E 30 10 0 VALVE CONTROL ADJUSTMENT DMM 0722 CP Rev A 25 29 33 11 0 HELPFUL SUGGESTION FOR THE GROUND PROXIMITY WARNING SYSTEM TEST 33 12 0 MULTIPLE ISOLATOR CONTROL OPTION 12 1 EXTERNAL MULTIPLE ISOLATOR 12 2 INTERNAL MULTIPLE ISOLATOR FIG 12 1 MPS 24 FRONT PANEL WITH INTERNAL MULTIPLE ISOLATOR 13 0 CONTROLLING MPS 24 WITH A PC OPTION 13 1 SOFTWARE INSTALLATION 13 2 RUNNING THE PROGRAM 13 2 1 GENERAL MENU 13 2 2 OPERATION MENU 13 3 AUTOMATIC TEST 13 4 TEST REPORTING 14 0 CALIBRATION 14 1 ZERO CORRECTION 14 2 GAIN CORRECTION 15 0 USE OF AN EXTERNAL VACUUM PUMP 16 0 ARINC OPTION 17 0 TROUBLE SHOOTING AND MAINTENANCE SUGGESTIONS 17 1 TEST FOR PNEUMATIC LEAKAGE AND REPAIR 17 2 CLEANING OF THE PUMP S VALVES Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced 44 43 44 45 MPS 24 User
20. RIETARY INFORMATION 38 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 13 2 2 Operation Menu The Operation menu is similar to the HHRCU terminal display There are three numeric rows of five columns The upper row is for the measured values the second row is for the target values and the third row is for the pressures in inHg The columns are first left for altitude in feet or meters and static pressure Ps in inHg second for altitude rate in feet min or meters min third for airspeed in knots kmph or mph and dynamic pressure Pd in inHg fourth for airspeed rate in kt min kmph min or mph min and fifth for Mach number and total pressure in inHg The measuring units in use are shown in the lower left The bottom of the display is for the commands information Commands There are two rows of commands for which F keys are to be used First Row AF1 dAL To increase the altitude in little steps After the function is selected operate with up and down cursors to increase or decrease the values AF2 dAS To increase the airspeed in little steps AF3 dALR To increase the altitude rate in little steps AF4 ALR To input the desired value of altitude rate with numbers AF6 To vent the system to the ambient pressure AF7 SET To pass from the direct input of feet F4 and knots F5 to the input of Ps static pressure and Pd dynamic pressure AF8 MEM To memo
21. TARY INFORMATION 46 This material not to be disclosed or reproduced
22. User s Manual DMM 0722 CP Rev A To execute the programmed profiles push the Red Shift key followed by DEFAULT that means EXECution a will precede the first target value shown in the SET AL Line of the display If the A key is pressed a capital letter will precede the SET AL advising the operator that the MPS 24 is in Program Mode in the step defined by the alphabet letter preceding the Set AL The No of the program in execution appears for some seconds in place of the units of measure To choose another test profile just push the DEFAULT key operate the PROG key and insert the program No that is needed press again the DEFAULT then EXEC the defined program will be executed Each test point corresponds to a letter the letter corresponding to a particular test point is displayed in the SET line of the display before the Set Altitude this advises the operator that the MPS 24 is in Program Mode To pass to the second step push the A key or wait the programmed time Every programmed step can be reached in this way to go back to the previous step press the V key the MPS 24 will immediately control the pressures to reach the requested parameters To memorize the programmed test profiles press the F6 key the ADTS retains in its memory the profiles also when switched off To use the MPS 24 in the normal way press DEFAULT Also when in the PROG mode it is possible to insert whichever parameter usi
23. alid only for the Operation mode The first line starting from the upper position is the line of the measured values The second line is the line of the target set values The third line is for the pressures static pitot and total The bottom line shows the Pt Ps ratio for the Mach number and for the unit of measure in use The columns of the first three lines are for the altitude airspeed and altitude rate respectively Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 11 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A The four row 20 column alphanumeric LCD is back lighted and supports no light plus four levels of back light intensity Figure 6 1 shows the HHRCU display in the operational mode 6 2 Keyboard Starting from the upper line the keys are laid out in the following arrangement see diagram or the HHRCU The LCD UP ARROW key M upper left first row is used to increase the LCD backlighting intensity level The LCD DOWN ARROW key W upper right first row is used to decrease the LCD backlighting intensity level AL AS and AR respectively are for altitude airspeed and altitude rate These keys are used before the numeric keys to set the desired values The SET key is used to change the unit of measurement of pressure The VENT key is used to reset the ambient pressure in the static and pitot circuits for the safe disconnection of test lines
24. and setting its AR 0 this removes the control of the static pressure Alt Asp Rate Rate Wait LO L1 500 100 0 300 0 60 30 5000 100 3000 300 0 60 30 1000 100 3000 300 90 0 0 0 100 3000 300 90 0 0 500 100 3000 300 90 0 0 1000 100 3000 300 90 0 0 1500 100 3000 300 90 0 0 2000 100 3000 300 90 0 0 3000 100 3000 300 90 0 0 4000 100 3000 300 90 0 0 6000 100 3000 300 90 0 0 8000 100 3000 300 90 0 0 10000 100 3000 300 90 0 0 12000 100 3000 300 90 0 0 14000 100 3000 300 90 0 0 16000 100 3000 300 90 0 0 18000 100 3000 300 90 0 0 20000 100 3000 300 90 0 0 22000 100 3000 300 90 0 0 25000 100 3000 300 90 0 0 30000 100 3000 300 90 0 0 35000 100 3000 300 90 0 0 40000 100 3000 300 90 0 0 45000 100 3000 300 90 0 0 50000 100 3000 300 90 0 0 TABLE 2 D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced DMM 0722 CP Rev A 32 MPS 24 User s Manual DMM 0722 CP Rev A 10 0 VALVE CONTROL ADJUSTMENT If after long running periods the MPS 24 does not stabilize well or works with excessive overrun use these functions to re adapt the control capability of the valves It requires approximately 20 minutes for each circuit to be re adjusted This procedure must be run with the MPS 24 disconnected from the UUT because over pressure generated may damage the instrument To run it be sure that no leakage is present in the MPS 24 pneumatic circuitry since small leakage may cause the program to run long
25. bient Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 24 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A The function avoids the running of the flow valves if the operator does not connect the pneumatic hoses to the instrumentation and at the same time commands the ADTS to reach an altitude different from barometric one and or an airspeed different from zero The function starts to operate if the volume becomes too big for the commanded rate leaving the pneumatic hose open in ambient is like connecting the ADTS to a very big volume The intervention of the protection is commanded by DcSMx and DcDMx parameter in the fine tuning list accessible with the function Fz DcSMx sets up the intervention point to protect the static line DcDMx sets up the intervention point to protec the Pitot line the intervention depends by the set up values If the parameter s value is greater then 300 the function will not work 9 PROGRAMMING MPS 24 If particular test profiles must be often executed the MPS 24 can be easily programmed with the desired values of Altitude Airspeed Altitude Rate and Airspeed Rate To do it press the Blue Shift key followed by the DEFAULT key that means PROGram A new menu appears prompting the operator to insert or choose the profile No It is convenient to prepare the requested test profile seating at
26. ctric power comes back the ADTS senses the pressure in the lines and forces the control system to equalize the measured ones if altitude are gt 8000 feet Pitot and static lines can be manually discharged using two flow control regulators placed in the front of the test set The manual discharge operation does not generate pitot negative pressure or airspeed exceeding 450 kt 5 0 EQUIPMENT DESCRIPTION 5 1 Front Panel Two regulated pressure ports on the front panel as shown in Figure 5 1 provide connections to the aircraft pressure ports No 9 is for the static and no 10 is for the pitot port The diameters of the two quick disconnect couplers are different sizes to preclude incorrect connection Manual regulators 3 and 4 are used to vent the system in case of electrical power interruption In case of not recovered electrical power after the removal of the protection caps manually open slowly counter clockwise regulators 3 and 4 together making sure that the V No 3 does not cause an excessive airspeed and the E No 4 does not cause an excessive altitude rate If the ADTS was manually vented before the startup close the needle valves prior to power on Connections to external pressure vacuum generators must be tightly closed fittings 5 and 6 of Figure 5 1 Fitting 5 is the positive pressure port and may be used to apply a positive pressure of not more than 2 000 hPa relative This may be used if the int
27. desired Mach number press RETURN GO The airspeed corresponding to this Mach number at the previously set altitude is now shown in the SET line of the airspeed If another Mach Number at a different altitude has to be entered the same procedure must be followed since the Mach number is only calculated and placed as target AS Again this must start from a condition where AR is not equal to 0 8 9 Center Line Correction If an altitude difference between the ADTS and the UUT is required the BLUE SHIFT F3 function key can be used for this purpose If the altitude value of the UUT is above the ADTS the correction value must be a positive integer An before the READ Altitude indicates to the operator that the corrected altitude is being displayed 8 10 True Airspeed Use the BLUE SHIFT F4 function key to input the temperature for the true airspeed TAS A T before the Read Airspeed signals the operator that the TAS is indicated and not the IAS To restore the IAS reading press the RED SHIFT Fd key Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 23 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 8 11 Very Low Airspeed control This function is useful when working with helicopters where very low airspeed below 30 kts must be generated and measured The special function F5 must be used this function calibrates accurately the total pressure equalizing it to the
28. e from the Control mode press the MEAS CTRL key When the MEAS CTRL key is pressed the HHRCU will show the display shown in Figure 8 2 To resume the previous control condition when the measuring action is over press the BLUE SHIFT key in the lower left followed by the MEAS CTRL KEY CTRL Control This will restore the MPS 24 to Control mode After using the MEAS CTRL function it is not necessary to restore the MPS 24 to the previous control state Press MEAS CTRL followed by the BLUE SHIFT followed by the MEAS CTRL key again The test set will stop the MEAS CTRL control function and it will be possible to input new target values ALTITUDE AIRSPEED 8001 100 0 8000 MEAS MEAS TOL ct L643 768 9 1 022 0 179 Ft Kt HP Pt Ps MACH UNITS HHRCU in MEAS mode Figure 8 2 HHRCU in Measure Mode Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 20 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 8 5 Leak Test This function performs the leak test of the static and pitot lines using a built in timing function generated by the internal computer quartz clock Leak rates are calculated every second and are automatically reported in ft min and kt min on the Leak menu Select the leak test function by pressing the LEAK RESUME key The HHRCU display in the Leak Test mode is shown in Figure 8 2 For the best measurement wait until the HHRCU display has become stable Then press the
29. e is entered the MPS 24 will not perform the leakage measurement When the MPS 24 is performing the leak check the following menu appears Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 26 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A oma ALTITUDE AIRSPEED t72 000 500 100 0 LEAK WAIT 72 sec 0 160 FAR43 amp LK MACH UNITS Where LEAK WAIT means that there is still to wait 72 sec to end the leak check this depends from the Leak set up time Usually 60 sec are imposed to stabilize the reading plus 60 sec to perform the leak check in total 120 sec When the MPS 24 has finished to perform the leak check the following menu appears showing the leakage of the static RA and of the pitot lines RS AIRSPEED 172 100 0 0 500 100 0 0 WAIT 999 RSO 4 0 160 FAR43 amp LK Pt Ps MACH UNITS In this menu RA 2 means that the leakage of static is 2 ft min RS 0 4 shows a pitot leakage of 0 4ft min and WAIT 999 means that to pass to the next step there is to push the A up arrow key Note that if at a certain step a leak check has been programmed it is suggested to set up a wait time that leaves the operator enough time to control the leak or better if a wait time zero is entered the next step will be reached only if A up arrow is pushed Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced MPS 24
30. ed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 13 2 Running the Program From the directory where the MPS 24PC software has been placed type MPS 24PC then ENTER First enter the selection of the RS232 port number Then choose the instrument to be tested Information about the instruments to test and the operator are displayed To skip this information just press ESCAPE and the Operation menu will appear It is possible also to start the control software with the computer not connected to the MPS 24 If so you will be prompted to check the connection or to wait If the MPS 24 is not sending any data to the PC initialization phase or switched off the program will not show its operation window As soon as the MPS 24 has terminated its startup and if it is properly connected the operation window is displayed 13 2 1 General Menu Pressing F8 key the following menu will appear 1 Operational Test 2 Leak Test 3 Automatic Test Select 4 Reporting of Test 5 Save Test 6 Initial Setting 7 EXIT To execute the desired operation press the relevant number e Pressing 1 causes the program to start the test e Pressing 2 will start the manual leak test the automatic one can be accessed from inside the automatic test e To choose the profile for automatic test press 3 The following menu will appear 1 Test Profile Review 2 Test Profile List 3 Previous Menu Pressing No 2 the prof
31. ed to set the desired values of the controlled parameters when used with RED or BLUE SHIFT functions FO F9 Note Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 13 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A Some of the F legends on the upper position of the numeric keys are not used and can be programmed for custom requirements e The UP triangle key A is used to increase by a pre programmed step the different parameters AL AS and AR e The DOWN triangle key V is used to decrease by a pre programmed step the different parameters AL AS and AR e The PROG EXEC DEFAULT key is used for programming functions PROGram is used for entering the programming mode EXECute to initiate the program and DEFAULT for returning to the operational mode The AL AS AR UP DOWN ARROW key is used before the previous key to establish the parameter that must be changed The BLUE SHIFT key F is used to activate the upper left functions on the keys marked in blue The RED SHIFT key 9 is used to activate the upper right functions on the keys marked in red e The GO ENTER key 4 is used to input the desired data to the MPS 24 e The EPR NOR key is used to generate a total pressure static pressure ratio starting from the desired altitude The blue upper left NOR on this key is used to reestablish the NORmal air data operation when used with BLUE SHIFT
32. er For the static line the Function Key F8 must be used with the code word of 0099 When the valve s parameter adjustment is in progress instead of the units of measure the script ADJ STA appears in the lower right corner Ignore the beeps generated in this phase since they only indicate that the set points imposed by software have been reached For the pitot line the Function Key F9 must be used When the valve s parameter adjustment is in progress instead of the units of measure the script ADJ PIT appears in the lower right corner After F8 or F9 has been used wait until the valves restoring program is ended This is shown by the disappearing of the a m scripts and the units of measure are again displayed in the lower right display Before memorizing the new control parameters check stabilization of altitude and speed If stabilization is good memorize the new control valves parameters by pressing the MEM key 11 0 HELPFUL SUGGESTION FOR THE GROUND PROXIMITY WARNING SYSTEM TEST When large volumes are involved i e B 727 and B 747 a special technique must be used To maintain a constant descent rate of 5 000 ft min for the Excessive Sink Rate test it is suggested to first achieve an altitude of 11 000 ft with a speed of 360 kt After 11 000 ft and 360 kt have been reached the following new target must be entered into the MPS 24 AL 4 000 ft AR 5 500 ft min AS 0 kt Operate the MPS 24 w
33. ernal pressure generator of the MPS 24 is not adequate for the pitot load Fitting 6 is the vacuum port It may also be used as a vacuum source or to fasten special adapters with suckers to the aircraft sometimes used for the static port This port may be used to connect an external vacuum pump to the MPS 24 to substitute for the internal one Electrical connectors switches and warning lights Connection to the electrical power No 2 Connection to the HHRCU No 7 Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 10 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A Connection for the multiple isolator optional No 8 This connector may be used to activate directly from the HHRCU the electrovalves of four static and four pitot lines Manual Vent Ext Press O O O 6m D MARCHIORI Air Data Test Set MPS24 Static Pitot Remote VIZ Multiple Isolator 1 On Off Switch 8 Multiple isolation Connector 2 Power Connector 9 Static Port 3 Pitot Vent needle Valve 10 Pitot Port 4 Cross bleed needle Valve 11 Labyrinth pressure equalizer 5 External Pressure Port 12 Water extraction button 6 External Vacuum Port 13 4A Fuse 7 HHRCU Connector 14 Power On LED Figure 5 1 MPS 24 Front Panel 6 0 DESCRIPTION OF THE HHRCU The HHRCU is composed of two parts the keyboard and the LCD 6 1 Display The scripts written on the frame surrounding the LCD are v
34. est sequence press the RETURN GO key to return to the Operations menu 8 7 Engine Pressure Ratio EPR The engine pressure ratio i e Pt Ps measurement is made starting from the desired static pressure value in inHg Start from a condition where AR is any value that is not equal to zero Connect test connections per the aircraft maintenance manual and press the EPR key The HHRCU display shown in Figures 8 4 and 8 5 will prompt the operator to input the desired values of starting pressure and the desired ratio Enter the relevant values to input the static pressure in Inches Hg then the EPR The MPS 24 will reach and maintain the desired Pt Ps value To return to the normal mode press the BLUE SHIFT followed by EPR This returns the test set to the normal mode using the BLUE SHIFT NORmal function M ALTITUDE AIRSPEED ENG PRESS RATIO UNITS HHRCU in EPR input mode Figure 8 4 HHRCU in EPR Input Mode Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 22 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A M ALTITUDE AIRSPEED 26275 321 8 0 26274 EPR 6000 10 500 5 250 154750 1 500 0 784 Ft Kt in Pt Ps MACH UNITS Figure 8 5 HHRCU in EPR Control Mode 8 8 Mach Number Instead of an airspeed value the Mach Number can be entered as a control parameter The procedure is as follows press BLUE SHIFT then the FO also the 0 or zero key After input of the
35. from the aircraft at the end of the test The LEFT ARROW key is used to delete the last digit entered if it is incorrect The MEM key is used to store data inside the MPS 24 memory The LEAK key is used to automatically perform the leak test without a stopwatch RESUME written in red at the upper right of the key is used to restore the previous condition and must be used after the RED SHIFT The MENU key is used to switch from the Operative display to the Limits display The MEAS key is used to stop the control of the pressure for measuring the parameters without the interference of the pressure control system This key may be considered the panic button to quickly stop the operation of the unit The minus key is used to set negative altitudes static pressure larger than the ambient The point key is used to input decimal points for speed and EPR Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 12 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A A N mt ALTITUDE AIRSPEED RATE pecs 9235 160 9 6025 11000 160 0 6000 RSS Saale 42 6 760 3 PRESS 1 059 0 286 Ft Kt hP PyPs MACH UNITS F2 Fb F5 Fe F8 Fh PROG EXEC DEFAULT as F Fa 1 2 F7 Fg 7 8 en rg D 3 Te o w E m a1 i T o 7 7 7 Q Figure 6 1 HHRCU Display in Operational Mode e The numeric keys 0 9 F0 9 are us
36. he HHRCU In addition it has other functions such as printing out the results direct input of pressures and measuring the pressures in inches Hg with four digit decimal points The interconnecting cable P N 24 S PC2 and software issue 2 66 or higher embedded in MPS 24 are required The MPS 24 communicates through the serial port of an AT compatible PC Hardware required includes an IBM PC AT compatible computer with FPU co processor a video graphics adapter VGA monitor and serial port COM 1 13 1 Software Installation Note that the software package is in DOS format A new Windows 95 issue will be supplied before summer 1999 Copy the contents of the diskette in a directory of your computer In this software package a demo program PROFILI is included with preset test points for the automatic test The PROFILI program has to be put in the same directory where MPS 24PC software is placed to avoid problems when passing from the manual test procedure to the automatic one If the supplied test points are not necessary for your needs they can be easily changed or deleted by running the program PROFILI A Default file is included required by the MPS24PC program If this file is not found the program will prompt the operator to define a test profile The program REPORT is also included It is used to review old test reports and to print them Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 36 This material not to be disclos
37. he numeric keys the new value followed by the RETURN GO key The new altitude limit will be displayed and the gt symbol will shift to the next limit ALMi If this parameter has to be changed proceed as described above If the value is to be retained press the RETURN GO key again to cycle to the next parameter ALMx 51000 ALMi 1500 ASMx 450 MaMAx 1 00 ARMx 6000 AS m 300 DA 500 DS 10 DR 500 Pt Ps MACH UNITS HHRCU in limits mode Figure 8 1 HHRCU in Limit Menu Proceed this way to change or retain the limits and the step values until all the parameters have been cycled through and the gt is no longer displayed At this point press the MENU key again and the MPS 24 will return to the Operations Menu The new limits will automatically be utilized by MPS 24 for all future operations at startup It is possible to have new limits stored as default in the MPS 24 memory If the new limits are not to be set up as default just change the limits using the MENU key when in the limits menu press SET and start changing the limits as required If the new limits have been selected and it is required to maintain them as default without switching the MPS 24 Off when in normal control mode press Fz enter the CODE that is 0099 Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 18 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A Be careful if wrong numbers are stored in thi
38. ile list will appear Here it is possible to select the desired one Pressing No 1 the selected profile will appear no changes are allowed here the changes are possible only within the Profile program Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 37 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A e Pressing 4 will select the report of the test if data has been memorized See next paragraph for memorization F8 e Pressing 5 will save the performed test e Pressing 6 calls the Initial setting The following mask will appear Instrument 1 Altimeter 2 Anemometer 3 Machmeter Choose the type of instrument that has to be tested After this the following limit menu appears Min Altitude feet 1500 Max Altitude feet 60000 Max Airspeed knots 800 0 Max Mach Number 2 500 Max Altitude Rate ft min 6000 Airspeed Rate Kt min 150 Delta Altitude feet 100 Delta Airspeed Knots 50 0 Delta Altitude Rate Ft min 500 Check for acceptability validate each value pressing ENTER or insert the number that You need To skip this Menu press ESC After this the instrument s data are asked 1 Instrument Code XXXXXX Description YYYYYYYYYYY 2 Instrument Code XXXXXX Description YYYYYYYYYYY Operator ZZ2Z2ZZ ZZZZZ To skip this menu press ESC Issue Nov 1998 D Marchiori PROP
39. in the pitot and static ports or test lines if connected If the altitude sensed in the static line is less than 8 000 ft the MPS 24 will automatically impose the VENT function When the normal start up process is complete the legend TEST SET CAN BE DISCONNECTED will appear When this occurs press RETURN GO 4 to enter the Operational mode If the ambient altitude measured in the static line is greater than 8 000 ft the following conditions will be automatically imposed the set Airspeed will be adjusted to the value measured in the pitot line the Set Altitude will be adjusted to the value measured in the static line and the Set AL Rate will be changed to 3 000 ft min and VENT function will be not imposed A repetitive beep beep is used to signal that the target condition has been achieved Use the BLUE SHIFT F2 function keys to turn the beep feature on or off If a power loss condition is experienced and manual venting is required due to pressure in the test lines this can be accomplished by opening the two needle valves X and Y Figure 5 1 Be sure the valves are closed after venting is completed Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 15 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 8 0 OPERATION 8 1 Entering Altitude and Airspeed Values 8 1 1 Direct Entry To enter an altitude press the AL key on the upper row and enter the desired altitude
40. irst time the operation program requires to set the Transmission Rate RATE LOW or HIGH Use UP key A or DOWN key A to select the correct Rate then push the GO key The following Data Labels will be displayed Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 43 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 203 STANDARD ALT Ft 204 BARO CORRECTED ALT Ft 205 MACH NUMBER M 206 COMPUTED AIRSPEED Kt 210 TRUE AIR SPEED Kt 212 ALT RATE Ft min 215 DIFFERENTIAL PRESSURE hPa 217 STAT PRESSURE hPa 234 BARO CORRECTION hPa On the HHRCU display Data turn up three at a time under the notice ARINC SERVICE It is possible to run over Data Index trough UP key A or DOWN key A During Data display the pressure control mode continues on MPS 24 Pushing alternatively on the GO and Fe keys it s possible to pass from operational menu to ARINC Data display starting from the last selected one 17 0 TROUBLE SHOOTING AND MAINTENANCE SUGGESTIONS If the max altitude or the airspeed cannot be reached there are two possible causes pumps wearing or dirty parts inside their valves or pneumatic leakage 17 1 Test for pneumatic leakage and repair A good way to check for leakage is the following remove the crate from the box Remove also the front panel shut with taps the hoses that eventually remain open Pay attention to not touch the parts under tension 115 V AC
41. ith the radio altimeter simulator as suggested in the Aircraft Maintenance Manual Sufficient time is left to make the relevant test at the required descent rate At the end of the test change these special set values back to normal parameters Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 33 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 12 0 MULTIPLE ISOLATOR CONTROL OPTION MPS 24 can be equipped with multiple isolator There are two options external and internal 12 1 External multiple isolator When external multiple isolator P N MPS 24EMI is furnished for MPS 24 it looks as in Figure 3 1 It can be controlled with the HHRCU The connector for the Electric Insulation Box MPS 24 EMI is installed only when it is sold together with the MPS 24 But it is possible to install it later in this case the MPS 24 must be returned to DMA there is to install additional software and cables Four static lines and four pitot lines can be controlled using the HHRCU keyboard Connect the multiple isolator plug connector to the socket of the MPS 24 Number 7 in Figure 5 1 connect the quick disconnect static socket to the MPS 24 static line and the multiple isolator pitot plug to the MPS 24 pitot port Connect the required static and pitot output to the static and pitot lines of the aircraft and leave the unused lines closed During normal function the valves are normally
42. maximum value can be lowered with keyboard Accuracy of the vertical speed generation 50 ft min or 2 of the set value whichever is greater Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 5 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A e Airspeed Range 10 to 800 kt with internal pumps Reading accuracy 0 4 kt 150 kt Resolution 0 1 kt over 50 kt 1 kt from 20 to 50 kt Stability 0 2 kt 500 kt 0 01 in Hg Generated airspeed rate Default is 150 kt min can be set with keyboard up to 500 kt min e EPR generation The engine pressure ratio values are generated referenced to static pressure in inHg In this function the default limit Mach Number and Airspeed are not considered Range 0 to 4 0 s l Accuracy 0 002 s l Resolution 0 001 s l e Mach number e Range 0 200 to 4 000 e Accuracy 0 002 Mach s l e Resolution 0 001 Mach e Repeatability 0 001 Mach 4 4 Power Supply Requirement It is possible to connect the ADTS to power supply sources ranging from 115 to 220 V ac from 50 to 400 Hz 160 W 4 5 Interfaces Standard RS 232C IEEE 488 interface can be supplied as option ARINC 429 can be supplied as option MIL 1553 can be supplied as option 4 6 Dimensions e Size 20 in x 16 in x 12 in e Weight 60 LB 4 7 Environmental e Storage temperature 20 to 70 C e Operating temperature 10 to 50 C e Sealing Case and
43. ng the first line AX keys followed by the numeric keys plus the GO ENTER key Gay Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 28 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A oma ALTITUDE AIRSPEED Asp 450 15 00 6000 Rate 300 15 LO 0 Ls O AAAAAAAA Stp a Pt Ps MACH UNITS Figure 9 1 HHRCU in PROGram Input Mode AIRSPEED 120 0 0 120 0 6000 0 695 22 920 O2 LO EE RE LT Figure 9 2 HHRCU Running in PROGRAM Mode 9 1 Example programming the MPS 24 according the FAR 43 appendix E The parameters of document FAR 43 Appendix E July 29 1965 for the altimeters test may be stored in the following way The data of the table 1 must be stored into the MPS 24 memory following the method of previous pages at the paragraph PROGRAMMING MPS 24 D Marchiori PROPRIETARY INFORMATION 29 Issue Nov 1998 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A step Alt Asp Rate Rate Wait LO L1 A 1500 100 3000 300 90 0 0 B 0 100 3000 300 90 0 0 C 500 100 3000 300 90 0 0 D 1000 100 3000 300 90 0 0 E 1500 100 3000 300 90 0 0 F 2000 100 3000 300 90 0 0 G 3000 100 3000 300 90 0 0 H 4000 100 3000 300 90 0 0 6000 100 3000 300 90 0 0 J 8000 100 3000 300 90 0 0 K 10000 100 3000 300 90 0 0 L 12000 100 3000 300 90 0 0 M 14000 100 3000 300 90 0 0 N 16000 100 3000 300 90 0 0 O 18000 100 3000 300 90 0 0 P 20000 100 3000 300 90 0
44. ollowing conditions exist e Minimum uncertainty of the primary standard value at the measurement points e Pressure transducer undamaged The calibration is made by changing the zero and the gain values 14 1 Zero Correction The engineering unit for the zero correction must be inHg The pressure calibrator or the transfer standard must be connected to the Static Port The altitude of over 50 000 ft must be reached with AS 0 As soon as the altitude has been reached insert AR 0 and wait until the readings stabilize When the readings are stable take note of the three values calibrator pressure MPS 24 static pressure Ps and MPS 24 pitot pressure Pt Assume the calibrator pressure as the true pressure Operate the Fz key entering the Fine Tuning Mode Insert the code word 0099 and the MPS 24 variable parameters appear Ignore the initial parameters used for the fine tuning of the pressure control system Adjust them up or down and press the GO RETURN key repeatedly until the NULLS zero static script appears Enter the result of the operation as the new NULLS according to the following formula New NULLS True Pressure Read Ps Old NULLS Press the GO RETURN key twice the script NULLP zero Pitot appears Apply the similar formula to the pitot zero correction New NULLP True Pressure Read Pt Old NULLP Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 41 This material not to be disclosed
45. open To use them press FI This function activates the multiple isolator in Leak Mode FH permits the control of multiple isolator but in MEAS Mode Pressing the numbers 1 4 close and open the static valves pressing numbers 5 8 close and open the pitot valves 6699 indicates valve open x indicates valve closed 66__99 In the lower line of the display The position starting from the left of the or the x shows the condition of the relevant valve Alternatively pressing the same number opens and closes the same valve Pressing 0 will open all the valves Pressing 9 will close all the valves Pressing the RETURN GO key to resume normal mode all valves open 12 2 Internal multiple isolator When internal multiple isolator P N MPS 24EMI is furnished for MPS 24 the apparatus has different configuration as defined in the following Figure Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 34 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A aaa ANUAL A fa D MARCHIORI A AIR DATA TEST SET MPS24 E m B o aak O 7 e Q V A 12 9 b 1 On Off Switch 9 Static Ports 2 Power Connector 10 Pitot Ports 3 Pitot Vent needle Valve 11 Labyrinth Pressure 4 Cross bleed needle Valve 12 Water extraction button 5 External pressure Port 13 4A Fuse 6 External Vacuum Port 14 Power On led 7 HHRCU
46. or 220 VAC depending if in USA or in Europe switch on the MPS 24 and wait for the initialization procedure If the leakage is on the total pressure line command an airspeed eventually leaving the static at ambient with Altitude Rate at zero for not controlling the static valves Put the MPS24 in MEAS mode Use pliers with rounded jaws like the ones used to remove external tab washers to close one plastic hose at a time Check watching at the indication on the HHRCU when the leakage stops Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 44 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A When the leakage stops it means that the leakage is downstream Go on throttling the plastic hoses until the leakage reappears this means you have insulated the leaking element If you damage the plastic hoses don t worry they are standard polyethilene 4 OD 0 04 thick Usually DMA purchases Imperial Eastman Poly Flo 44P but whichever other standard polyethilene 1 4 OD hose is OK The elements that have a bigger possibility of leaking are e fittings of the hoses blue and red coming from the regulated static and total pressures to the quick disconnect fittings of the front panel e Internal closing valve of the quick disconnect fitting of the front panel 17 2 Cleaning of the pump s valves It is easy to disassemble the valves of the pumps since it is possible to
47. or decrease by the defined step until the key is released Note that the last UP DOWN ARROW key function selected is always valid for the UP ARROW or DOWN ARROW function For example if a step of 500 has been entered and an altitude of 4 500 ft has been reached using this method to pass to the altitude of 5 000 ft the UP ARROW key has only to be pressed once to generate another 500 ft step Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 16 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A 8 2 Entering pressure Values Pressure values can be entered for static and pitot lines in the required engineering units The total pressure must always be higher than the static one To enter a static pressure in the displayed unit of measure press the Blue Shift key left shift followed by AL key then insert the numeric values of the requested pressure To enter a differential pressure in the displayed unit of measure press the Blue Shift key left shift followed by AS key then insert the numeric values of the requested pressure To enter a total pressure in the displayed unit of measure press the Red Shift key right shift followed by AS key then insert the numeric values of the requested pressure 8 3 Changing Preset Limits with the Limits Menu CAUTION Limits are preset at the factory to handle most test standard conditions and to protect
48. ov 1998 D Marchiori PROPRIETARY INFORMATION 3 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A e Air speed in various units e Total pressure in various units e Simultaneous altitude and airspeed e Vertical speed ft s e Mach number e True airspeed calculation e Engine pressure ratio EPR or Ptot Pstat Figure 4 1 MPS 24 Air Data Test Set with external multiple isolator 4 2 Additional Features The following functions and features are provided e Leakage test Using the LEAK key of the HHRCU leakage is automatically measured in the desired engineering units per minute The condition before the leakage test is restored by pushing the Resume key This function also running with the multiple Isolator part number MPS 24EMI Optional can separately control up to four Static and four Pitot lines in various combinations e Vent function At the end of the instruments test this function automatically brings the static and pitot lines back quickly but safely to the atmospheric Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 4 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A pressure When the safe condition is reached the control unit LCD reads Test Set and can be disconnected Selectable units with the SET key of the Control Unit For altitude feet and meters For pressure in Hg hPa mmHg and psi For speed
49. rize the measured data for the calibration report Second Row Fl dAL To increase the altitude of preset step after the function is selected operate with the up and down cursor keys to increase or decrease the values F2 dAS To increase the airspeed of preset step F3 dALR To increase the altitude rate of preset step F4 AL To input the desired altitude or Ps static pressure F5 AS To input the desired airspeed or Pd dynamic pressure F6 MEAS To stop the control and pass in the Measuring Mode F7 PROG To pass from the manual input of the target points to the ones that have been preset and registered in a file with program PROFILI F8 MENU To pass to the Chooser menu Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 39 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A e F 10 is not shown and can be used to change the units of measure For display refresh if required press the HOME key 13 3 Automatic Test If a particular test sequence has to be used often it is easy to pre program this sequence give it a name and use it in automatic mode To program a new test sequence or to change an old one run the PROFILI program When the required test profile is entered named and saved it may be selected from the MPS 24PC program Chooser menu From the Operation menu press the F7 key and pass from one step to another with the F1 increase and F2 decrease
50. s phase the MPS 24 will not run in this memory the control parameters and the calibration numbers are stored After the first parameter comes out press GO ENTER many times about 35 times until LSAVE is displayed The indicated number will be 0 zero enter 1 one and continue pressing GO ENTER When out of the Fine Tuning file press twice MEM The new limits are now stored in the non volatile memory of the MPS 24 You can see this by switching Off and On the MPS 24 and check the limits after the new switching On CAUTION If a unique value has been entered for a particular test remember to reset the limits after testing to factory or maintenance shop default values to avoid damage to the MPS 24 or aircraft instrumentation 8 3 3 Changing Units of Measurement While in the Operations Menu press the SET key A gt symbol will appear before Ft feet To change to mt meters press the UP ARROW key followed by the RETURN GO key and the gt will now move before the kt knots legend To change to kilometers per hour press the UP ARROW key the gt will now move before the Kh legend To change to miles per hour press the UP ARROW key again the gt will now move before the Mh legend When the desired engineering unit for the speed is achieved press the RETURN GO key At this point the gt symbol will move in front of the In inches of mercury or inHg this is
51. the desk with a notebook and the proper aircraft maintenance manual It is possible to enter 30 test profiles each one containing 25 control points each one composed of the following parameters Altitude Airspeed Altitude Rate Airspeed Rate wait time before passing to the following point LO stabilization time for the leak test LI measuring time for the leak test When the Prog key is pressed the following menu appears The programming phase starts from the symbol m Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 25 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A To set a new name of the program enter in the program mode pressing the Blue shift followed by the DEFAULT key a little m will blink at the right side of a series of letters Press the Backspace key 8 times to reach the initial letter At this point it is possible to write the required letter pressing many times the A or the W key until the wanted letter has been reached at this point press GO ENTER the position of the next letter is now occupied by the little m Repeat the previous steps until the last possible letter has been reached Remember that it is possible to use every ASCII character passing from the capital letters to the small ones pressing the Blue shift key and to the numbers symbols pressing again the Blue shift key Also if a mistake has been made in this phase it is possible to correct it
52. the electrovalves normally closed without electrical power prevent airflow and do not generate Ps gt Pt Also the manual regulators do not generate Ps gt Pt e Software In any case the above condition is not allowed e Software limitations Issue Nov 1998 Max altitude Max airspeed Max vertical speed Airspeed rate Max Mach number Note Airspeed and Mach number always interact It is therefore impossible to overcome the maximum value of one or the other Software protections If data entered are larger than software imposed limitations the ADTS continues and controls the pressures according to the imposed limitations D Marchiori PROPRIETARY INFORMATION 8 This material not to be disclosed or reproduced MPS 24 User s Manual r mt ALTITUDE AIRSPEED RATE ee 9235 160 9 6025 11000 160 0 6000 Pee Gene 42 6 760 3 PRESS 1 059 0 286 Ft Kt hP PyPs MACH UNITS PROG EXEC DEFAULT m a o F2 Fb F5 Fe F8 Fh lt gt gt o oe ol N oO as a o o o E T a T H 7 7 a 2 m 0 A Issue Nov 1998 Figure 4 2 Layout of the HHRCU D Marchiori PROPRIETARY INFORMATION This material not to be disclosed or reproduced DMM 0722 CP Rev A MPS 24 User s Manual DMM 0722 CP Rev A 4 14 Protection Against Electrical Power Loss In case of electrical power surge nothing happens to the lines under test When the ele
53. the engineering unit for the altitude airspeed and for total pressure Ptot To change this parameter press the UP ARROW key The possible engineering units options are hp for hectoPascal in for inches of mercury mm for millimeters of mercury and pi for pounds per square inch After selecting the required engineering units press RETURN GO key and the gt symbol will disappear This indicates that all parameters have been selected 8 4 Ambient Measurement Pause Mode Panic Button The MEAS CTRL function is also used as a pause or the panic button Issue Nov 1998 D Marchiori PROPRIETARY INFORMATION 19 This material not to be disclosed or reproduced MPS 24 User s Manual DMM 0722 CP Rev A The MEAS CTRL key toggles between measurement and control modes When the MEAS CTRL key is pressed the MPS 24 stops controlling pressure and only the pressure measuring system is activated The circuit under test is now completely isolated from the pressure generator and a precision measurement can be obtained when the line pressures in the system under test and the MPS 24 are stabilized Whenever a precision measurement is required especially if large volumes are involved the MEAS CTRL function should be used The MEAS CTRL can also be used as a panic button or pause control to halt operation of the MPS 24 and to give the operator time to investigate a situation To select the Measurement mod
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