Failure of the RA Transmission Antenna 1

TASK 34-42-00-810-834-A
Failure of the RA Transmission Antenna 1

1. Possible Causes

ANTENNA-RA XMSN, 1 [6SA1]
XCVR-RA, 1 [2SA1]
wiring between the RA transceiver 1 (2SA1) and the RA transmission antenna 1 (6SA1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-42-00-740-002	BITE Test of the Radio Altimeter
ASM 344201
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 34-42-00-740-096-A ** ON A/C NOT FOR ALL

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

4. Fault Isolation
Subtask 34-42-00-810-087-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message RA1 ANTENNA (6SA1):

remove the ANTENNA-RA XMSN, 1 [6SA1] AMM 34-42-11-000-001
remove the XCVR-RA, 1 [2SA1] AMM 34-42-33-000-001
do a check of the wiring between the RA transceiver 1 (2SA1) and the RA transmission antenna 1 (6SA1) ASM 344201.

(1) If there is continuity:

(2) If there is no continuity:

repair the wiring between the RA transceiver 1 (2SA1) and the RA transmission antenna 1 (6SA1): pin AB/C of the RA transceiver 1 (2SA1) ASM 344201.
install the RA transceiver 1 (2SA1) and the RA transmission antenna 1 (6SA1).

(a) If the fault continues:

Subtask 34-42-00-740-097-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:10 UTC