Gps Course Select Sources; Total Air Temperature Sources; Static Air Temperature Sources - Garmin GTN 725 Installation Manual

2.3.7

GPS Course Select Sources

The GTN unit can accept GPS course select data from multiple ARINC 429 sources. If multiple sources
of GPS course select 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 GPS course select sources are as follows from highest to lowest:
1. ARINC 429 label 100 from EFIS or Honeywell EFIS
2. ARINC 429 label 100 from Garmin GDU
3. ARINC 429 label 100 from EFIS/Airdata
4. ARINC 429 label 100 from Sandel EHSI
5. ARINC 429 label 100 from Garmin GAD 42
6. ARINC 429 label 100 from Data Concentrator
7. TO/FROM course from the appliance's Omni-Bearing Selector (OBS) control
2.3.8

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. The 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 Garmin GDU
3. ARINC 429 label 211 from EFIS/Airdata
4. ARINC 429 label 211 from Data Concentrator
5. RS-232 bus from Shadin Fuel and Air Data Computer
2.3.9

Static Air Temperature Sources

The GTN unit can accept static air temperature data from multiple ARINC 429 sources. If multiple
sources of static 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. The priorities of the static air temperature sources are as follows from highest to lowest:
1. ARINC 429 label 213 from Airdata
2. ARINC 429 label 213 from Garmin GDU
3. ARINC 429 label 213 from EFIS/Airdata
4. ARINC 429 label 213 from Data Concentrator
GTN 725/750 TSO Installation Manual
190-01007-02
Page 2-5
Rev. A