Failure of the RA Antennas 2

TASK 34-42-00-810-821-A
Failure of the RA Antennas 2

1. Possible Causes

XCVR-RA, 2 [2SA2]
wiring between the RA reception antenna 2 (5SA2) and the RA transceiver 2 (2SA2)
wiring between the RA transmission antenna 2 (6SA2) and the RA transceiver 2 (2SA2)
ANTENNA-RA RCPTN, 2 [5SA2]
ANTENNA-RA XMSN, 2 [6SA2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-42-00-740-002	BITE Test of the Radio Altimeter
ASM 344202
AMM 34-42-11-000-001	Removal of the Radio Altimeter Antenna
AMM 34-42-11-400-001	Installation of the Radio Altimeter Antenna
AMM 34-42-33-000-001	Removal of the Radio Altimeter Transceiver
AMM 34-42-33-400-001	Installation of the Radio Altimeter Transceiver

3. Fault Confirmation
Subtask 34-42-00-740-078-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the radio altimeter AMM 34-42-00-740-002.

4. Fault Isolation
Subtask 34-42-00-810-072-A ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message CHECK LRRA-2 ANTENNAE CIRCUITS:

(1) If the fault continues:

do a check of the wiring between the RA reception antenna 2 (5SA2) and the RA transceiver 2 (2SA2) ASM 344202.

(a) If there is no continuity:

(b) If there is continuity:

do a check of the wiring between the RA transmission antenna 2 (6SA2) and the RA transceiver 2 (2SA2) ASM 344202.

1 If there is no continuity:

2 If there is continuity:

a If the fault continues:

Subtask 34-42-00-740-079-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:09 UTC