Incorrect Radio-Altimeter Height Indication (RA1)

TASK 34-42-00-810-848-A
Incorrect Radio-Altimeter Height Indication (RA1)

1. Possible Causes

coaxial cables between the RA antennas (5SA1, 6SA1) and RA transceiver 1 (2SA1)
XCVR-RA, 1 [2SA1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052230
ESPM 2053230
AWM 344201
AMM 34-42-11-920-001	Radio Altimeter Antennas and Coaxial Cables Replacement
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 Isolation
Subtask 34-42-00-810-117-A

A. If the fault continues:
(1) Do the test of the coaxial cables between the RA antennas (5SA1, 6SA1) and RA transceiver 1 (2SA1), refer to ESPM 2052230 and AWM 344201.
(a) If the test of the coaxial cables is not satisfactory:

Replace coaxial cables 4602VB AMM 34-42-11-920-001 ESPM 2053230.

(b) If the test of the coaxial cables is satisfactory:

Replace XCVR-RA, 1 [2SA1] AMM 34-42-33-000-001 AMM 34-42-33-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:33:11 UTC