Installation Instructions

190-01007-A3 GTN 6XX/7XX AML STC Installation Manual
Rev. 4 Page 2-17
2.4.2.8 Multiple 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 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
2.4.2.9 Multiple 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 GDU Format 1
3. ARINC 429 label 213 from EFIS Format 2
4. ARINC 429 label 213 from Data Concentrator
2.4.3 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 Figure E-40 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 and the GDL 88 Part 23 AML STC Installation Manual,
P/N 190-01310-00.
2.4.4 Antenna Considerations
This section contains mounting location considerations for the antennas required for the GTN units.
General installation guidance is provided to ensure the installed antennas meet the GTN requirements;
however, the approval of antenna installations is beyond the scope of the GTN AML STC. For mounting
the GPS/WAAS antennas, refer to Garmin Antenna STC SA02018SE-D. The installer may use other
FAA approved data to gain a separate antenna installation approval from this STC.
Figure 2-6 shows the recommended placement of GPS/SBAS and COM antennas.