Multiple True Airspeed Sources - Garmin GTN 625 Installation Manual

3.3.5

Multiple True Airspeed Sources

The GTN unit can accept true airspeed data from multiple ARINC 429 and RS-232 sources. If multiple
sources of true 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 true airspeed sources are as follows from highest to lowest:
1. ARINC 429 label 210 from Airdata
2. ARINC 429 label 210 from Airdata/AHRS
3. ARINC 429 label 210 from GDU Format 1
4. ARINC 429 label 210 from EFIS Format 2
5. ARINC 429 label 210 from GAD Format 1
6. ARINC 429 label 210 from Data Concentrator
7. RS-232 bus from FADC Format 1 or Airdata Format 1
3.3.6 Multiple VLOC Selected Course Sources
The GTN unit can accept VLOC selected course data from the sources list below. If multiple sources of
VLOC selected course 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 VLOC selected course sources are as follows from highest to lowest:
1. ARINC 429 label 100 from EFIS Format 4
2. ARINC 429 label 110 from GAD Format 1
3. TO/FROM course from an Omni-Bearing Selector (OBS) control
3.3.7 GPS Selected Course Sources
The GTN unit can accept GPS selected course data from multiple ARINC 429 sources. If multiple sources
of GPS selected course 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 GPS selected course sources are as follows from highest to lowest:
1. ARINC 429 label 100 from EFIS Format 1 or 3
2. ARINC 429 label 100 from GDU Format 1
3. ARINC 429 label 100 from EFIS Format 2
4. ARINC 429 label 100 from EFIS Format 4
5. ARINC 429 label 100 from GAD Format 1
6. ARINC 429 label 100 from Data Concentrator
7. TO/FROM course from an Omni-Bearing Selector (OBS) control
3.3.8 Total Air Temperature Sources
The GTN unit can accept total air temperature data from multiple ARINC 429 and RS-232 sources. If
multiple sources of total air temperature 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 total air temperature sources are as follows from highest to lowest:
1. ARINC 429 label 211 from Airdata
2. ARINC 429 label 211 from GDU Format 1
3. ARINC 429 label 211 from EFIS Format 2
4. ARINC 429 label 211 from Data Concentrator
5. RS-232 bus from FADC Format 1 or Airdata Format 1
GTN 625/635/650 TSO Installation Manual
Page 3-4
190-01004-02
Rev. F