The 2 Meeting of the Future Air Navigation Systems
Contents
1. Downlink message All downlink message elements encapsulated between quotation marks with elements a space between each element if required e g DO Note Extracted from the decoded operational downlink Actual communication technical performance in seconds e g 35 Note Truncated to whole seconds Actual communications performance in seconds measured as the difference between time uplink sent 8 to operational response received 12 e g 80 19 PORT Pilot Operational Response Time ACP 18 ACTP 17 e g 45 Note Implementers should allow for negative values where the operational response is received before the MAS as per Error Reference source not found above When graphing PORT negative values should be counted as 0 20 COMTYP Data link communication type e g SAT Note The nine possible entries for COMTYP are SAT VHF HF SV SH VS VH HS HV Value is based on the MAS RGS field 6 and OPS RGS 7 See Table 2 Satellite SAT Very High Frequency VHF High Frequency HF 2 3 Field 20 COMTYP should have one of the nine values listed in column 3 of Table 2 GOLD Appendix D Table D 2 This information is based on the communication types associated with the MAS RGS and OPS RGS data fields Table 2 Possible values for media type in the CPDLC Data MAS RGS Communication Type OPS RGS Communication Type COMTYP SAT e g MAS RGS POR1 SAT e g OPS RGS POR1 SAT VHF e g2. Performance Analysis Tool G PAT User Manual E Gold Frame Application CPDLC file C Ocean21 GPAT Input Files RCP_Nov11_gold txt File Chart Filters Options Help CPDLC ACTP Cumulative Percentage 0 fee am ee am ejo am anj am 120 Time seconds Gad Frame Agpiicaian CPOLC ie RCP Navii_ gadt port Example Performance Measure CPDLC Performance Criteria RCP240 Filters e of Analysis Media Type Media Type Count of Msgs 120sec 150sec All 25 920 99 46 99 60 HF 158 80 63 85 44 SAT 24 473 99 61 99 70 VHF 1 189 100 00 100 00 v3 100 88 57 95 57 Figure 1 Figure 3 Filters Figure 11 Sample output chart and report References 1 International Civil Aviation Organization ICAO Global Operational Data Link Document GOLD Version 1 5 February 2013 Page 15 of 15 FIT Asia 2 WP11 Attachment 1 FANS INTEROPERABILITY TEAM ASIA FIT ASIA TERMS OF REFERENCE FIT Asia Objective and Scope The FANS Interoperability Team Asia FIT Asia shall be responsible for overseeing system configuration and the end to end monitoring process of datalink systems to ensure they are implemented and continue to meet performance safety and interoperability requirements within the Asian Region The FIT Asia shall Implementation a support the implementation and operational benefits of AIDC CPDLC and ADS Reporting and problem
3. a message alerting the user and requesting further action as explained in sections 2 4 and 2 5 4 4 Once the data has been loaded G PAT automatically generates a generic GOLD chart for the aggregate data and labels the tab Figure 1 5 Selecting the Performance Parameter and Criteria 5 1 Once the data is loaded the user will click on Chart in the main toolbar If the input data is ADS C there is only one option available ADS C and all other options will be grayed out 5 2 If the input data is CPDLC the user will select the performance parameter of interest ACP ACTP or PORT Similarly ADS C will be grayed out Page 7 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual 5 3 Once the performance parameter is selected another box will pop up displaying the available performance criteria For CPDLC parameters the options will be RCP 240 or RCP400 and for the ADS C parameter the options will be RSP180 or RSP 400 6 Filtering the Data 6 1 Ifthe user would like to apply any additional filters to the data the user will select Filters from the main toolbar The following types of filters are available Month FIR flight information region Media Type SAT VHF HF etc GES ground earth station Operator Aircraft Type 6 2 Within the Filters pull down Menu the number of options available for each filter type within the data set is shown ne
4. personal computers to analyse data that has been captured in csv format as prescribed in GOLD Appendix D 2 3 Version 3 of the G PAT software is now available to ATSP on the ICAO GOLD secure website G PAT Version 3 guidance material is appended to this paper at Attachment 1 FIT Asia 2 IP 08 ACTION BY THE MEETING 3 1 The meeting is invited to a note the information contained in this paper and b discuss any relevant matters as appropriate Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Version 3 0 dated March 2013 FIT Asia 2 IP 08 Attachment 1 GL Pac Al al User Manual Version 3 0 March 2013 US Federal Aviation Administration Technical Center Atlantic City New Jersey FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual 1 Introduction 1 1 The purpose of the GOLD Performance Analysis Tool G PAT is to perform the analysis prescribed in Appendix D of the Global Operational Data Link Document GOLD for monitoring performance of the operational data link system in a given airspace 1 2 The G PAT creates performance charts illustrating the cumulative distribution for both the CPDLC and ADS C performance measures in the format suggested in Appendix D of the GOLD The performance related to CPDLC messages is measured against the Required Communication Performance RCP specifications and the latency for ADS C reports is measured against the Required Surveill
5. resolution processes b establish a problem reporting system c review de identified problem reports identify trends and determine appropriate resolution d develop interim operational procedures to mitigate the effects of problems until resolution e monitor the progress of problem resolution f prepare summaries of problems encountered and their operational implications System performance and monitoring processes g determine and validate system performance requirements h establish a performance monitoring system 1 assess system performance based on information from the CRA j coordinate system testing and trials k identify accountability for each element of the end to end system 1 develop document and implement a quality assurance plan that will provide a stable system m identify end to end system configurations that provide acceptable data link performance n ensure that such configurations are maintained by all stakeholders New procedures o coordinate testing in support of implementation of enhanced operational procedures Reporting p report safety related issues to the appropriate State or regulatory authorities for action q provide reports to relevant ATM coordinating groups and r report to RASMAG Relevant Central Reporting Agencies CRA and States will report as required to the FIT Asia ICAO Secretariat will submit reports to appropriate sub groups of APANPIRG Composition of FIT Asia The FI
6. FIT Asia 2 IP 08 28 29 March 2013 International Civil Aviation Organization UNN sa The 2 Meeting of the Future Air Navigation Systems Interoperability Da Team Asia FIT Asia 2 n Bangkok Thailand 28 29 March 2013 3 Agenda Item 4 Data Link Guidance Material FAA DEVELOPED GOLD PERFORMANCE ANALYSIS TOOL GPAT VERSION 3 0 Presented by Airways New Zealand SUMMARY This paper presents information on the latest update to the GOLD Performance Analysis Tool G PAT that can be used for the analysis of data collected in accordance with GOLD guidelines for post implementation monitoring This tool has been developed by the United States Federal Aviation Administration to aid ANSPs in post implementation monitoring This paper relates to Strategic Objectives A Safety Enhance global civil aviation safety Global Plan Initiatives GPI 17 Data link applications GPI 22 Communication infrastructure 1 INTRODUCTION 1 1 The United States FAA has developed software to aid ATSP in the task of post implementation monitoring Version 3 of this software with its associated guidance material is now available 2 DISCUSSION 2 1 The G PAT tool has been developed by the FAA to help users perform graphical analysis to assess the performance of the data link system in their airspace with respect to the RCP RSP specifications 2 2 The tool is written in java script and can be run on MS Windows based
7. MAS RGS ADK VHF e g OPS RGS ADK VHF HF e g MAS RGS H02 HF e g OPS RGS H02 HF SAT e g MAS RGS POR1 VHF e g OPS RGS ADK SV SAT e g MAS RGS POR1 HF e g OPS RGS H02 SH VHF e g MAS RGS ADK SAT e g OPS RGS POR1 VS VHF e g MAS RGS ADK HF e g OPS RGS H02 VH HF e g MAS RGS H02 VHF e g OPS RGS ADK HV HF e g MAS RGS H02 SAT e g OPS RGS POR1 HS 2 4 G PAT Version 3 is distributed with the file Mediatypes2012FAA txt which can be used to populate the media type field if not contained in the input file As noted above G PAT will automatically detect whether or not this field is contained in the input file The user may also create and use a different file as long as it follows the same format Page 4 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual 2 5 The file Mediatypes2012FAA txt sets the default media type to be VHF and lists all known satellite SAT and high frequency HF RGS If the COMTYP field is not detected a window will pop up alerting the user Figure 1 shows the pop up window that will be displayed The user will either select Cancel to abort or select Media Type File to enable selection of the file to be used File C Documents and Settings theresa brewer Desktop GPAT Demo cp_test txt doesn t have Media Type Media Type File Cancel Figure 1 Media ty
8. T Asia will consist of representatives from States ANS Providers communication service providers CSP CRAs IATA CANSO IFALPA and IFATCA Aircraft and ancillary equipment manufacturers may also be requested to participate Approved by APANPIRG 22 September 2011
9. amp synchronized to within 1 second of UTC 12 ransit Time The transit time of the ADS C downlink in seconds calculated as the difference between 10 Aircraft Time and 11 Received Time e g 30 13 COMTYP Data link communication type e g SAT Note The three possible entries for COMTYP are SAT VHF HF Value is based on the RGS field 6 Satellite SAT Very High Frequency VHF High Frequency HF 3 Pre Filtering the Data 3 1 Prior to using G PAT the input data will require pre filtering to conform to the requirements specified in Appendix D of the GOLD 3 2 The CPDLC input data should be filtered according to the following 3 2 1 The raw CPDLC transaction data should contain only uplink CPDLC transactions that end with a WILCO response DM 0 Any transactions that end with any response other than WILCO should be filtered out 3 2 2 All uplink transactions with an uplink initiation message containing elements UM 79 84 UM91 92 UM 116 123 or UM169 should be filtered out Page 6 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual 3 2 3 All uplink transaction occurring during an outage as reported by one of the data link service providers DSP should be removed 3 2 4 G PAT will automatically filter out any records containing uplink transactions with a negative ACP ACTP or PORT The records removed from the analysis by G PAT will be written to a file wit
10. ance Performance RSP specifications described in the GOLD 1 3 The G PAT provides the ability to apply basic filtering to the input data such as removing messages from specific ground stations communication media operators etc In addition G PAT allows the data to be plotted from various perspectives such as performance shown by flight information region FIR operator aircraft type etc 1 4 This manual provides the format required for the CPDLC and ADS C input files and details how to use the various features 2 Input Files 2 1 The input files containing the CPDLC and ADS C operational data should be in the comma separated values CSV format specified in Appendix D of the GOLD The files should contain all of the fields prescribed in the GOLD as well as an additional field appended to the end of each record specifying the media type If the media type field is not included in the file G PAT will automatically detect this and refer to a separate file to populate this field based on the remote ground stations RGS listed for each record This is explained further in section 2 4 2 2 Table 1 describes the 20 fields required for the input data files containing the CPDLC data link transactions The first 19 fields contained in Table 1 are from the GOLD Appendix D Table D 1 Table 1 CPDLC data collection points Description and or remarks SS The four letter ICAO designator of the facility e g NZZO Aircraft The aircraf
11. ck mark will appear as shown in Figure 4 7 2 This option will remain selected for all subsequent charts produced for the current or new input files Note The user must un check the box shown in Figure 4 or restart the program to discontinue the plotting of the aggregate on the charts Page 9 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Aggregate on Chart x Are you sure you want to show Aggregate on Chart Show Aggregate on Chart Figure 4 Pop up window for Show Aggregate on Chart 8 Select Series to Display 8 1 Once the filtering is complete and the user is ready to create the chart and report the user will click on the icon This will trigger a pop up window that will allow the user to select how the analysis is to be performed and displayed For example if the intended analysis is focused on showing performance by FIR the user will select the FIR option 8 2 Figure 5 shows the available options for the series to be shown on the chart and in the report The default setting for this filter is the All data option Fa select series to display x All data Month FIR Oo ooo OO Media Type GES Operator Aircraft Type Airframe Sort by Name Sort by Count OK Cancel Figure 5 Example of pop up window to select series for analysis 8 3 Once the series is selected the options available for that series are dis
12. d in this filter with no additional filtering applied Note It is possible that some options will be grayed out completely unavailable due to previous filtering 6 5 By default the filter pop up window displays the options sorted by name in alphabetical order By selecting the Sort by Count button located on the bottom right side of the window the options can be sorted in descending order by the number of data points associated with each option The Select All and Deselect All buttons provide the named functionality which is available to aid in the selection of few or many of the available options To return to the default press the Sort by Name button E4 Filter by Operator x Select Filtering Operator WAAL 3375 3467 z y AAR 30 30 Vv ABW 51 51 Yi ACA 2872 2873 ViACX 9 9 y AEA 1508 3157 y AFL 927 934 V AFR 11972 14632 Select All Sort by Name DeSelect All Sort by Count OK Cancel Figure 3 Example of options for Operator filter type 7 Additional Options 7 1 In version 3 the only additional option available is to plot the aggregate performance for the filtered data set To show the aggregate performance on the chart the user will select Options gt Show Aggregate on Chart from the main toolbar Figure 4 shows the window that will be displayed The user will click the box and a che
13. erformance Analysis Tool G PAT User Manual Description and or remarks 7 Report Type The type of ADS C report extracted from the ADS C basic group report tag where tag value 7 PER 9 EMG 10 LDE 18 VRE 19 ARE 20 WCE As some aircraft concatenate more than one report in the same downlink extract the ADS C report tag from each ADS C basic group and identify them in the REP_TYPE column by using the first letter of the report type as an identifier e g for a concatenated report containing two ADS C basic groups for a periodic report and a waypoint event report the field will contain PW Where a downlink does not contain a ADS C basic group the REP_TYPE field will be left blank Latitude The current latitude decoded from the ADS C basic group The format is for North or for South followed by a decimal number of degrees e g 33 456732 Longitude The current longitude decoded from the ADS C basic group The format is for East or for West followed by a decimal number of degrees e g 173 276554 10 Aircraft Time The time the ADS C message was sent from the aircraft in HH MM SS e g 03 44 15 Note Decoded from the ADS C basic group timestamp extracted as seconds since the most recent hour See RTCA DO 258A EUROCAE ED 100A section 4 5 1 4 11 Received Time The ANSP timestamp on the receipt of the ADS C message in HH MM SS e g 03 44 45 Note Extracted from ANSP system data recording time st
14. h a filename that is the same as the input file with the addition of _R to the end 3 3 The ADS C input data should be filtered according to the following 3 3 1 All ADS C downlink messages occurring during an outage as reported by one of the data link service providers DSP should be removed 3 3 2 G PAT will automatically remove duplicate ADS C messages and messages with a negative estimate for latency In addition G PAT will remove any records with a media type that is not recognized e g S The records removed from the analysis by G PAT will be written to a file with filename that is the same as the input file with the addition of _R to the end 4 Loading the Data 4 1 Before using the tool the user should confirm that the files GPAT bat and GPATv3 jar are both contained in the working directory The user will double click on the batch file GPATv3 bat to start the tool 4 2 To load the CPDLC or ADS C input data the user can either select File gt Open from the pull down menu of the main toolbar or click on the icon in the top right corner of the application below the main toolbar The user then selects the directory and file containing the data to be analyzed The input data must be in a comma separated format following the data field structure described in Table 1 for CPDLC data or Table 3 for ADS C data 4 3 If the data does not contain the required COMTYP field G PAT will display
15. nchronized to within 1 second of UTC MAS LACK The ANSP timestamp on receipt of the MAS in HH MM SS format e g receipt time 03 43 35 Note Extracted from ANSP system data recording time stamp synchronized to within 1 second of UTC MAS LACK round In seconds 9 8 e g 10 trip time Aircraft FMS time In the operational response messages in HH MM SS e g 03 44 15 stamp Note 1 For FANS I A extracted from the ATCmessageHeader timestamp in the decoded operational response message See RTCA DO 258AEUROCAE ED 100A section 4 6 3 3 Note 2 For ATN B extracted from the AircraftCPDLCPDU timestamp in the decoded operational response message ANSP timestamp In HH MM SS e g 03 44 45 on the receipt of Note Extracted from ANSP system data recording time stamp the operational synchronized to within 1 second of UTC response Operational From sending uplink 8 to receipt of operational response 12 in seconds message round trip e g 80 time 14 Downlink response In seconds 12 11 e g 30 transit time 15 Uplink message All uplink message element identifier preceded by U encapsulated between elements quotation marks with a space between each element e g U118 U80 Note Extracted from the decoded operational uplink that initiated the transaction Page 3 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Description and or remarks
16. pe pop up window 2 6 Table 3 describes the 13 data fields required for the ADS C input file The first 12 fields contained in Table 3 are taken from the GOLD Appendix D Table D 3 The last row in Table 3 field 13 is the media type and is necessary to distinguish performance amongst the satellite SAT VHF and HF data link messages As explained in sections 2 4 and 2 5 the media type can be populated using a separate file if it is not contained in the input file Table 3 ADS C data collection points Description and or remarks The four letter ICAO designator for the facility e g NZZO 2 Aircraft The aircraft registration in ICAO Doc 4444 Format no hyphens packing Registration dots etc e g N104UA Note Extracted from ACARS header or application message 3 Aircraft Type The ICAO aircraft type designator e g B744 Designator Note Extracted from ANSP database using aircraft registration as key 4 Operator The IATA designator for the aircraft operating agency e g UAL Designator Note Extracted from ANSP database using aircraft registration as key 5 Date In YYYYMMDD format e g 20081114 Note Extracted from ANSP system data recording time stamp synchronized to within 1 second of UTC RGS Designator of the RGS that ADS C downlink was received from e g POR1 Note This is a 3 or 4 letter designator extracted from the ACARS header DT line Page 5 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD P
17. played Figure 6 shows an example of FIR selected and the corresponding options for FIR The default for this window is to have none of the options selected to prevent the user from selecting too many options to be reasonably displayed This is mainly attributable to the numerous options available for GES and Operator Page 10 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Select series to display x Alldata BIRD 10860 10860 Month CYQX 37087 37087 FIR EGGX 37936 37936 Media Type KZNY 25445 25445 GES LPPO 0 15236 Operator Aircraft Type Airframe Sort by Name Sort by Count OK Cancel Figure 6 Example with FIR selected 8 4 Once the options are chosen for the selected series and the user clicks on OK the chart and corresponding report will be generated and displayed 8 5 To refresh and overwrite the chart in the existing window or tab the user can click on the L icon under the main toolbar If the refresh icon is not selected prior to generating a new chart a new tab will be opened for the new chart 9 Special Report 9 1 The GPAT has an additional feature that will prepare a chart and report for all operators aircraft types or airframes not meeting the 95 criteria for the specified performance parameter The user can click on the A icon to
18. roperties of the chart title to be modified The chart title can be hidden by de selecting the check box displayed to the right of the chart title text box The text of the title can be changed in addition to the font size and color of the title Page 12 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Chart Properties Plot Other XY Plot Domain Axis Range Axis Appearance General Label Time seconds Font Paint Other Ticks Range Show tick labels ick label font Select Show tick marks Cancel Figure 8 Chart Properties window Plot tab 10 6 The Plot tab allows properties of the horizontal domain x axis and of the vertical range y axis to be independently modified As shown in Figure 8 the label as well as its font size and color can be changed Additional properties such as the showing or hiding of the tick labels and tick marks for the axes can be modified 10 7 The range displayed on the chart can be modified by selecting the Range tab shown in Figure 9 To adjust the range deselect the checkbox for Auto adjust range and then enter the desired minimum and maximum range values Other Auto adjust range Minimum range value Maximum range value Figure 9 Chart Properties windo
19. t registration in ICAO Doc 4444 Format no hyphens packing registration dots etc e g N104UA FANS 1 A Note Extracted from ACARS header or application message Aircraft address The 24 bit address in ICAO Doc4444 Format alphanumerical character in ATNB1 six hexadecimals Note Extracted from CM application message Aircraft type The ICAO aircraft type designator e g B744 designator Note Extracted from ANSP database using aircraft registration as key Page 2 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Description and or remarks 4 Operator The ICAO designator for the aircraft operating agency e g UAL designator Note Extracted from ANSP database using aircraft registration as key 5 Date In YYYYMMDD format e g 20081114 Note Extracted from ANSP system data recording time stamp synchronized to within I second of Universal Time Coordinated UTC MAS RGS Designator of the RGS that MAS downlink was received from e g POR1 Note This is a 3 or 4 letter designator extracted from the ACARS header DT line 7 OPS RGS Designator of the RGS that the operational response was received from e g AKL1 Note This is a 3 or 4 letter designator extracted from the ACARS header DT line Uplink time The timestamp on the uplink CPDLC message sent by the ANSP in HH MM SS format e g 03 43 25 Note Extracted from ANSP system data recording time stamp sy
20. utilize this function 9 2 When using this function it is important to first select Chart from the main toolbar to choose the performance parameter and criteria of interest 10 Modification of the Chart 10 1 Once a G PAT chart has been generated the properties of the chart can be changed to modify the view 10 2 The default view is a scale from 90 to 100 percent on the vertical range y axis with increments of 1 percent To change the view to a scale from 0 to 100 percent on the vertical Page 11 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual range axis right click and select Auto Range To return to the default setting press the Refresh Chart button 10 3 To zoom on a particular portion of the chart click and drag the mouse to draw a box enclosing the desired area This area will then be enlarged to fit the screen 10 4 Several other chart properties are accessible by right clicking on the chart and selecting Properties This action will open the Chart Properties window which contains the three tabs shown in Figure 7 Title Plot and Other Chart Properties Title Plot Other General Show Title Text CPDLC ACP Font Color eee Cancel Figure 7 Chart Properties window Title tab 10 5 The Title tab shown in Figure 7 allows p
21. w Plot tab Other section Page 13 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual Chart Properties General v Draw anti aliased Background paint Co Select Series Paint Series Stroke Series Outline Paint Series Outline Stroke Cancel Figure 10 Chart Properties window Plot tab 10 8 The remaining tab Other shown in Figure 10 allows the line colors in the chart to be modified 11 Save or Print a Copy of the Chart or Report 11 1 To save the chart as a jpeg file the user will click on the 3 icon This will display a window allowing the user to select where to save the file 11 2 To save the chart as a PNG file the user can right click the chart and select Save as 11 3 To save the report the user will click on the E icon This will display a window allowing the user to select where to save the file and whether to save in a comma separated csv format or a space delimited text txt format 11 4 Figure 11 shows a sample chart and report for the observed ACTP by media type The input file and corresponding directory is shown at the top of the application window The filename is also shown in the bottom right hand corner of the chart window 11 5 The details of the analysis are summarized at the top of the report Page 14 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD
22. xt to the name of each filter type For the example shown in Figure 2 there are 5 options for FIR 3 options for Media Type and so on The number of available options will vary depending on the data set loaded into the program F4cold Frame Application ADS C file C Documents and Settings File Chart Filters Options Help E E Month 4 A FIR 5 Media Type 3 GES 769 n0 Operator 285 Aircraft Type 52 99 5 99 0 98 5 eccaacaaccncoscocccooconaenanannpacccccoccccscnccccnanccocosoo z cAol i A aT 97 5 ie ee eee error Figure 2 Example of Filters pull down menu 6 3 Upon selection of a particular filter type in the Filters pull down Menu a new window is presented that contains further information about the selected filter Figure 3 illustrates a sample of a pop up window for an Operator filter type This window lists all of the existing options for the selected filter type and how many data points exist in the data set for each of those options Initially all options are selected Page 8 of 15 FIT Asia 2 IP 08 Attachment 1 GOLD Performance Analysis Tool G PAT User Manual 6 4 In Figure 3 there are 3 467 data points for AAL 30 data points for AAR and so on In this example it can be observed that another filter type was previously applied that reduced the number of available data points Thus for AAL only 3 375 out of 3 467 will be used in the proceeding analysis if AAL is selecte
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