Garmin GMA 340 Pilot's Guide
Contents
1. GARMIN PILOT DME ADF MEST 50 LO 2 GMA 340 Audio Panel COM2 NAV DME ADF GMA 340 NAV1 NAV2 voL uc SENS 1 2 gt ICS ISOLATION vot PA om CREW pilot s guide Front Panel Controls GMA 340 me 3 43 A AA 19 48 16 O a LO COM 1 ore 2 COM3 MIC MIC MIC SENS PILOT coN ABIN AUDIO ICS ISOLATION wi 5 ammmCREW SARNIN a mn mn om MKR 1 COM2 1 2 DME ADF m 5 7 yI Y 1 00 Front Panel Controls 340 Dual ee A 17 a TNT A 0 1 2 ADF1 ADF2 TEST sa HI PILOT LO COM1 COM 3 COM2 MIC MIC MIC SENS SPKR IGS ISOLATION voL pa 5 OPILOT Front Panel Controls GMA 340H 44444 4 AA 2 47 00 9 49 9 48 06 12 GARMIN TeS aa Se A ENET A 0 M 1 2 NAV1 2 DME ADF TEST sa m PILOT 5 orp LO kj com BINAUDIO2. is active when neither PILOT nor CREW LED are lit To switch from PILOT to CREW mode press the CREW button from CREW to PILOT press the PILOT button An LED ON indicates the isolation mode is active PILOT mode isolates the pilot from everyone else and dedicates the aircraft radios to the pilot exclusively The copilot and passengers share communication between themselves but cannot communicate with the pilot or hear the aircraft radios CREW mode places the pilot and copilot a common ICS communication channel The passengers are on their own intercom channel and can communicate with each other but cannot communicate with the crew or hear the aircraft radios ALL mode allows full intercom communication between everyone plugged in to the GMA 340 Aircraft radios are heard by all MUSIC 1 and MUSIC 2 stereo entertainment inputs are affected by the intercom mode selected The following table summarizes the ICS operation for the different modes supported by the GMA 340 PILOT HEARS COPILOT HEARS PASSENGER MUSIC 1 MUTING HEARS TRIGGERED BY PILOT selected Radios Copilot Passengers Copilot or passenger LED Pilot Passengers Copilot ICS activity LIT USIC 1 USIC 1 CREW Selected Radios Selected Radios Passengers Aircraft radio activity Pilot Copilot Pilot USIC 2 MKR activity LED Copilot USIC 1 MUSIC 1 in Dual Pilot or Copilot ICS LIT USIC 1 ADF ac
3. 40H Intercom volume and squelch VOX are adjusted using the following front panel knobs LEFT SMALL KNOB Unit ON OFF power control and Pilot ICS volume Full CCW DETENT position is LEFT LARGE KNOB Pilot ICS mic VOX squelch level CW rotation increases the amount of mic audio VOX level required to break squelch Full CCW is the hot mic position RIGHT SMALL KNOB IN position Copilot ICS volume OUT position Passenger ICS volume RIGHT LARGE KNOB Copilot and passenger mic VOX squelch level CW rotation increases the amount of mic audio VOX level required to break squelch Fully CCW is the HOT MIC position Each of the six microphone inputs have dedicated VOX circuits ensuring that only the active microphone s is are heard when squelch is broken This represents a vast improvement over the party line systems and reduces the amount of background noise in the headphones during cockpit communica tions After the operator has stopped talking the intercom channel remains momentarily open to avoid closure between words or normal pauses The GMA 340 provides three intercom modes PILOT CREW and ALL The mode selection is accomplished using the PILOT and or CREW buttons Pressing a mode button activates the corresponding ICS mode Pressing again deactivates the mode The operator can switch directly from PILOT to CREW or from CREW to PILOT by pressing the other mode button The ALL mode
4. CIAL INDIRECT OR CONSEQUENTIAL DAMAGES WHETHER RESULTING FROM THE USE MISUSE OR INABILITY TO OTAPPLYTO YOU REMEDY FORANY BREACH OF WARRANTY USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSIONS OF INCIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATIONS MAY To obtain warranty service call the GARMIN Customer Service department 913 397 8200 fora returned merchandise tracking number The unit should be securely packaged with the tracking number clearly marked on the outside of the package and sent freight prepaid and insured toa GARMIN warranty service station A copy of the original sales receipt is required as the proof of purchase for warranty repairs GARMIN retains the exclusive right to repair or replace the unit or software or offer a full refund of the purchase price at its sole discretion SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE 10 GARMIN AOM MKR com1 2 Hi 10 COM2 COM3 MIC MIC MIC SENS GMA 340 COM3 COM1 2 COM3 MIC MIC MIC GMA 340 Dual ADF GARMIN AOM MKR COM1 2 50 amm LO COM1 2 COM3 MIC MIC MIC SENS COPILOT GMA 340H 340 f m f DME ADF TEST pm a SPKR PILOT CABIN AUDIO pm PA gt COPILOT
5. GMA 340 NAV2 ADF1 ADF2 TEST p DME Screw COPILOT 340 7 DME ADF TEST a PILOT CABIN AUDIO Crew 11 GARMIN 02001 GARMIN Corporation GARMIN International Inc 1200 East 151 Street Olathe Kansas 66062 U S A GARMIN Europe Ltd Unit 5 The Quadrangle Abbey Park Industrial Estate Romsey SO51 9AQ GARMIN Corporation No 68 Jangshu 2 Road Shijr Taipei County Taiwan wwwgarmin com Part Number 190 00149 10 Rev C
6. ICSISOLATION vot k For SENS ammCREW 7 5 2 17 40 5 6 Function Selection Switches The left small knob 5 7 on units controls ON OFF function MKR BCN ICS COM NAV 4 a 13 15 16 Lf 18 19 Marker Beacon Lamps Marker Beacon Receiver Audio Select Mute Button Marker Beacon Receiver Sensitivity Indicator LED s Marker Beacon Receiver Sensitivity Selection Button Pilot Intercom System ICS Volume Also Passenger Volume on 340H Pilot ICS Voice Activated VOX Intercom Squelch Level Copilot and Passenger ICS Volume Control Pull out for Passenger Volume Copilot and Passenger VOX Intercom Squelch Level Crew Isolation Intercom Mode Button Pilot Isolation Intercom Mode Button Passenger Address PA Function Button Speaker Function Button Transceiver Audio Selector Buttons COM 1 2 COM 3 Transmitter Audio Mic Selection Buttons Split COM Button Not Available in Dual ADF Aircraft Radio Audio Selection Buttons NAV 1 NAV 2 DME ADF 1 ADF 2 Annunciator Test Button Locking Screw Access Photocell Automatic Annunciator Dimming and Failsafe Operation The GMA 340 is powered off when the left small knob 5 7 is rotated fully CCW into the detent To tum the unit on rotate the knob clockwise past the click The left small knobs also functions as the pilot or copilot s ICS volume control on the appropri
7. RN Speaker Output Pressing the SPKR button 12 selects aircraft radios over the cabin speaker The speaker output is muted whena COM microphone is keyed The GMA 340 speaker output level can be adjusted by your installing agency PA Function The PA mode is activated by pressing the PA button 11 Then when either the pilot s or copilot s microphone is keyed the corresponding mic audio is heard over the cabin speaker Ifthe SPKR button is also active then any selected speaker audio is muted while the microphone is keyed The SPKR button does not have to be previously active in order to use the PA function Pilot and copilot PA microphone speaker levels are adjustable by your installing agency Auxiliary Entertainment Inputs The GMA 340 and 340H provide two stereo entertainment inputs MUSIC 1 and MUSIC 2 The 340 Dual ADF has only MUSIC 1 MUSIC 1 is soft muted during all aircraft radio activity and normally during ICS activity MUSIC 2 is a non muted input These inputs are compatible with popular portable entertainment devices such as cassette tape or CD players The headphone outputs of these devices are used and plugged into MUSIC 1 or MUSIC 2 Two 3 5 mm stereo phone jacks should be installed in a convenient location for this purpose MUSIC 1 and MUSIC 2 have characteristics that are affected by the active intercom mode Refer to the table on page 7 Intercom System ICS Pilot and Copilot functions are reversed on the 3
8. approach and in certain instances to identify an airway Inaddition to the normal marker beacon functions the GMA 340 provides an audio muting function The lamps illuminate and an associated keyed tone is heard when MKR audio is selected when the aircraft passes over a 75 MHz marker beacon transmitter Audio Audio Keying Lamp Actuated Frequency 400 Hz Blue Outer 1300 Hz E o m o mo m Amber Middle 3000 Hz White Airway Inner The lamp and audio keying for ILS approach operation are summarized below The marker beacon audio level is aligned at the factory to produce its rated audio output However the output level is adjustable by your avionics installing agency thr being lit Low sensitivity is used on ILS a The 3405 marker beacon receiver controls located on the left side of the front panel 1 gh 4 The SENS button selects either high or low sensitivity as indicated by the HI or LO LED pproaches while high sensitivity allows operation over airway markers or to get an earlier indication of nearing the outer marker during an approach signal is received then pressing again wi selecting any other audio source on the G The marker audio is selected initially by pressing the MKR mute button 2 Ifno marker beacon 1 deselect the marker audio This operation is similar to A 340 However ifthe second button press occu
9. ate unit A failsafe circuit connects the pilot s headset and microphone directly to COM 1 in case the power is interrupted or the unit is turned off Lighting LED Button annunciator and marker beacon lamp intensity are controlled automatically by a built in photocell on the front panel Nomenclature backlightingis controlled by the aircraft dimmer buss Transceivers Audio level is controlled by the selected radio volume control Selection of either COM 1 COM 2 or COM 3 13 for both MIC and audio source is accomplished by pressing either COM 1 MIC COM 2 MIC or COM 3 MIC 14 The active com audio is always heard onthe headphones Additionally each audio source be selected independently by pressing COM 1 2 or COM 13 When selected in this way they remain active as audio sources regardless of which transceiver has been selected for microphone use When a microphone is keyed the active transceivers MIC button LED blinks approximately once per second to indicate that the radio is transmitting Split COM Not Available on Dual ADF Pressing the COM 1 2 button 15 activates the Split COM function When this mode is active COM 1 is dedicated solely to the pilot for MIC audio while COM 2 is dedicated to the copilot for MIC audio The pilot and copilot can simultaneously transmit in this mode over separate radios Both pilots can still listen to 3 NAV 1 NAV 2 DME ADF as selec
10. rs while a marker beacon signal is received then the marker audio is muted but not deselected The button s LED will remain lit to indicate that the source The GMA 3405 SmartMute func the audio when the current marker signal is no longer being received Inall cases the marker beacon lamps is still selected ion then monitors the marker signal and automatically unmutes operate independently of any audio selection and cannot be turned off The GMA 340 can drive external marker lamps if required GARMIN Corporation warrants this product to be free fro Limited Warranty m defects in materials and workmanship for one year from the date of purchase GARMIN will at its sole option repair or replace any components which fail in normal use Such repairs or replacement will be made at no charge to the customer for parts or labor The customer is however responsible for any transportation costs This warranty does not cover failures due to abuse misuse accident or unauthorized OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDI alteration or repairs THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL GANY LIABILITY ARISING UNDER WARRANTY OF MERCHANTABILITY OR FITNESS FORA PARTICULAR PURPOSE STATUTORY OR OTHERWISE THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS WHICH MAY VARY FROM STATE TO STATE INNOEVENT SHALL GARMIN BE LIABLE FORANY INCIDENTAL SPE
11. ted The Split COM mode is cancelled by pressing the COM 1 2 button a second time When in the Split COM mode the copilot may make PA announcements while the pilot continues using COM 1 independently When the PA button is pressed after the Split COM mode is activated the copilot s mic is output over the cabin speaker when keyed A second press of the PA button returns the copilot to normal Split COM operation If the COM radios utilize a transmit interlock system the Split COM function may require that this feature is enabled Refer to the radio s installation manual guidance GARMIN makes expressed or implied guarantees regarding the suitability of the Split COM feature in a given installation Com Swap Function The GMA 340 allows the use ofa remote mounted switch typically on the yoke to alternately transfer the active microphone back and forth between 1 and COM 2 Pressing the remote switch will have no affect if COM 3 is the active transceiver Ask your installing agency for details Aircraft Radios amp Navigation a Audio level is controlled by the selected NAV radio volume control Pressing NAV 1 NAV 2 DME ADF 1 ADF 2 16 or MKR 2 see MKR Beacon Receiver page 8 selects each audio source A second button press deselects the audio Inaddition the GMA 340 provides inputs for an unswitched aircraft radio TEL RINGER and an unmuted unswitched aircraft radio ALT W
12. tivity ALL Selected Radios Selected Radios Selected Radios Aircraft radio activity LED s Pilot Pilot Pilot MKR activity Copilot Copilot Copilot ICS activity OFF Passengers Passengers Passengers USIC 1 USIC 1 USIC 1 MUSIC 1 is normally muted during ICS activity However an installation option is available to disable ICS MUTE Then muting of MUSIC 1 will not occur due to ICS activity A panel mounted switch may be installed for this function The MUSIC 1 mute trip level is adjustable by the installing agency Mono Stereo Headset The use of stereo headsets is highly recommended If monaural headsets are plugged into stereo jacks that do not switch installed the unit will not be damaged If the pilot uses a monaural headset in a stereo jack no audio will be heard during failsafe operation When using a monaural headset the pilot s jack must A be equipped with stereo mono switch and it must be set to the mono position for proper failsafe operation A person listening on a monaural headset will hear only the left channel from the GMA 340 in both ears If amonaural headset is used at one of the passenger positions any other passenger listening stereo headset will hear audio in their left ear only unless their headset has stereo mono switch and itis set for mono 7 Marker Beacon Receiver The marker beacon is used as part of an ILS
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