Transponder Control Check - Garmin GI 275 Installation Manual

6.3.8

Transponder Control Check

This check is required for units configured as an MFD or an MFD/Standby ADI (with the Transponder
page configured on) that is interfaced to a GTX 345R remote transponder or a GTX 345 configured as a
remote transponder.
1. Power on the GI 275 in Normal mode.
2. Navigate to the Transponder page (it must be configured as the last page per Section 5.5.3).
3. With the GTX 345 transponder powered on, verify that there is not a yellow "X" over the XPDR
field.
4. Enter a code into the XPDR field using the keypad and press Enter.
CAUTION
When entering a code to check the transponder, do not enter a code that begins with a "7"
to avoid accidentally triggering an alarm at an ATC facility.
5. Verify that the code that was entered is now displayed in the XPDR field.
6. If dual transponders are installed, select XPDR 2 as the active transponder and repeat steps 3
through 5.
7. If dual transponders are installed, with XPDR 1 set as the active transponder, pull the #1
transponder circuit breaker and verify that XPDR 1 shows a yellow "X". Select XPDR 2 as the
active transponder and verify that it does not show a yellow "X". If the behavior above does not
occur, verify that the wiring is correct.
190-02246-10
Rev. 11
GI 275 Part 23 AML STC Installation Manual
Page 6-15