Loss of the CFDIU Input Bus on the RA1

TASK 34-42-00-810-829-A
Loss of the CFDIU Input Bus on the RA1

1. Possible Causes

XCVR-RA, 1 [2SA1]
wiring of the MAINTENANCE DATA INPUT bus from the RA transceiver 1 (2SA1) to the first terminal block

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 34-42-33-000-001	Removal of the Radio Altimeter Transceiver
AMM 34-42-33-400-001	Installation of the Radio Altimeter Transceiver

3. Fault Confirmation
Subtask 34-42-00-740-086-A

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

4. Fault Isolation
Subtask 34-42-00-810-080-A ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message RADIO ALTM 1 NO DATA FROM CFDIU:

(1) If the fault continues:

Do a check and repair the wiring of the MAINTENANCE DATA INPUT bus from the RA transceiver 1 (2SA1) to the first terminal block ASM 344201.

Subtask 34-42-00-740-087-A

B. Do the test given in Para. 3.

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