Static Air Temperature Sources; Gdl 88 Installation Considerations - Garmin GTN 625 Installation Manual

3.3.9

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. 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 GDU Format 1
3. ARINC 429 label 213 from EFIS Format 2
4. ARINC 429 label 213 from Data Concentrator

3.4 GDL 88 Installation Considerations

When a GDL 88 is installed with a GTN, altitude data can be forwarded from sources connected to the
GTN to the GDL 88. The GTN is also capable of forwarding Grey Code received from an altimeter
connected to a GTX transponder. All of these sources must meet the minimum performance requirements
of TSO-C10 or TSO-C106, or altitude digitizers/encoders must meet TSO-C88. (Reference AC 20-165,
Section 3-4(a)(1) and (2)).
If a compatible TAS system and the GDL 88 are installed in an aircraft, the compatible TAS system should
be directly connected to the GDL 88. The traffic data is then sent from the GDL 88 to the GTN over
HSDB. Refer to the GDL 88 interconnect diagrams for more information on the connection.
For more information on configuration of the GDL 88 and systems connected to the GDL 88, refer to the
GDL 88 Installation Manual (P/N 190-01122-00).
190-01004-02
Rev. F
GTN 625/635/650 TSO Installation Manual
Page 3-5