Multiple Baro-Corrected Altitude Sources; Multiple Heading Sources - Garmin GTN 635 Installation Manual

3.3.2

Multiple Baro-Corrected Altitude Sources

The GTN unit can accept baro-corrected altitude from multiple ARINC 429 and RS-232 sources.
If multiple sources of baro-corrected altitude 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. Priorities of the baro-corrected altitude sources are as follows from highest
to lowest:
1. ARINC 429 label 204 from Airdata
2. ARINC 429 label 204 from GDU Format 1
3. ARINC 429 label 204 from EFIS Format 1, 2, 3, or 4
4. ARINC 429 label 204 from Data Concentrator
5. RS-232 FADC Format 1 or Airdata Format 1
3.3.3

Multiple Heading Sources

The GTN unit can accept heading data from multiple ARINC 429 and RS-232 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.
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
GTN 625/635/650 TSO Installation Manual
190-01004-02
Page 3-3
Rev. C