Garmin GTX 335 w GPS Installation Guidance page 110

C.1 Altitude Source
Air data computers not listed below can still be approved under this STC if all of the following conditions are met: The air data computer provides the following
labels:
• 203 - Pressure Altitude
• 204 - Barometric-Corrected Altitude
• 210 - True Airspeed
The interface check for the altitude encoder described in section 7 must be successfully completed. The installation of the air data computer was previously FAA-
approved. The air data computer is TSO approved. The connections to the GTX must utilize shielding wiring of the type specified in this manual. Shields must be
terminated on the GTX side to connector shield block ground and on the Air Data Computer side in accordance with the Air Data Computer installation data. If the
Air Data Computer installation data does not specify a shielding method then terminate the shield at the Air Data Computer using the guidelines provided in
section 4.
Manufacturer Model
GDC 74( )
Garmin GDU 620
GAE
ACK Tech A-30
B & D 90004-003
190-00734-17
Rev. 1
Interfacing
Config
Equipment
Parameter
Configuration
ARINC 429 N/A
GENERAL
PURPOSE 1
ARINC 429
(Speed:
HIGH)
Configuration
N/A
Module Port
RS-232 N/A
ARINC 429 N/A
GTX 335 Config
GTX 335 Wizard Tool Configuration
Summary Setting
ADC ADC
(Speed: Low) (Speed: Low)
EFIS AIR DATA EFIS Air Data
(Speed: HIGH) (Speed: Low)
Garmin Altitude
GAE-12 Installed: Yes
Encoder: Present
Device: Altitude/Air Data Device
Input: Sandia/Icarus/ACK
ALT FMT 1 25 ft
Compatible Altitude Encoder
Resolution: 25 foot
ADC ADC
(Speed: Low) (Speed: Low)
Notes
This interface also provides
heading data.
Mod 8 or higher.
GTX 335 w/GPS Installation Guidance
Page C-2