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190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 2-15
2.4.2.3 Multiple Heading Sources
NOTE
Heading is not required by the GTN; however, to take full advantage of the GTN unit
capabilities, an optional heading source is recommended to allow the map to be
oriented to heading up, to provide autopilot roll steering on ARINC 424 heading legs,
to display TAS traffic and WX-500 Stormscope data on the moving map, and to
calculate winds if airspeed is also available.
The GTN unit can accept heading data from multiple ARINC 429, RS-232, and Synchro sources. If
multiple sources of heading data are supplied to the GTN, only valid data from the highest priority source
is used. If the highest priority source becomes unavailable, data is taken from the next-highest priority
source. The priorities of the heading sources are as follows from highest to lowest:
1. ARINC 429 label 314 from EFIS Format 1 or Format 3
2. ARINC 429 label 320 from EFIS Format 1 or Format 3
3. ARINC 429 label 320 from EFIS Format 2
4. ARINC 429 label 320 from GDU Format 1
5. ARINC 429 label 314 from INS/IRU
6. ARINC 429 label 314 from Data Concentrator
7. ARINC 429 label 320 from INS/IRU
8. ARINC 429 label 320 from Airdata/AHRS
9. ARINC 429 label 320 from GAD Format 1
10. ARINC 429 label 320 from EFIS Format 4
11. ARINC 429 label 314 from GAD Format 1
12. XYZ Synchro
13. ARINC 429 label 320 from Data Concentrator
14. ARINC 429 label 320 from Traffic Format 1, 2, 3, 4, 5, or 6
15. RS-232 FADC Format 1 or Airdata Format 1
16. RS-232 bus from Lightning Detector 1
2.4.2.4 Multiple Indicated Airspeed Sources
The GTN unit can accept indicated airspeed data from multiple ARINC 429 and RS-232 sources. If
multiple sources of indicated airspeed data are supplied to the GTN, only valid data from the highest
priority source is used. If the highest priority source becomes unavailable, data is taken from the next-
highest priority source. The priorities of the indicated airspeed sources are as follows from highest to
lowest:
1. ARINC 429 label 206 from GDU Format 1
2. ARINC 429 label 206 from Airdata/AHRS
3. ARINC 429 label 206 from Data Concentrator
4. RS-232 bus from FADC Format 1 or Airdata Format 1
57


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