190-01004-02
GTN 625/635/650 TSO Installation Manual
Rev. F
Page 3-3
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
3.3.4 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. 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
Summary of Contents for GTN 625
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