
190-01499-02
GTX 3x5 TSO Installation Manual
Rev. 1
Page 6-3
6.4.5 RS-422
6.4.6 HSDB
6.4.7 Pressure Sensor Correspondence
The optional pressure sensor module requires a correspondence adjustment to match the aircraft primary
altitude display.
6.5 Remote Unit Configuration
6.6 Diagnostic Information
6.7 Ground Checks
6.7.1 Interface Checkout
6.7.2 GPS Reception
The GPS checks described in this section are applicable to GTX 335 and GTX 345 units with the internal
GPS receiver.
6.7.2.1 VHF COM Interference Check
1. Using the GPS status page, verify.
2. Select 121.150MHz on the com transceiver to be tested.
3. Transmit for a period of 35 seconds.
4. Verify.
5. Repeat steps 3 and 4 for the following frequencies.
121.15MHz
131.22MHz
121.17MHz
131.25MHz
121.20MHz
131.27MHz
121.22MHz
131.30MHz
121.25MHz
131.32MHz
131.20MHz
131.35MHz
6. For VHF radios that include 8.33 kHz channel spacing, include the following frequencies in
addition to those listed above.
Selection
Description