L/G - VHF Transceiver Does Not Get Data from the LGCIU

TASK 32-31-00-810-884-A
L/G - VHF Transceiver Does Not Get Data from the LGCIU

1. Possible Causes

LGCIU-1 [5GA1]
LGCIU-2 [5GA2]
aircraft wiring
XCVR-VHF, 1 [1RC1]
XCVR-VHF, 2 [1RC2]
XCVR-VHF, 3 [1RC3]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 231200
AMM 23-12-00-740-001	BITE Test of the VHF System
AMM 23-12-33-000-001	Removal of the VHF Transceiver
AMM 23-12-33-400-001	Installation of the VHF Transceiver
AMM 32-31-71-000-001	Removal of the LGCIU
AMM 32-31-71-400-001	Installation of the LGCIU
AMM 32-69-00-740-001	BITE Check of Landing-Gear Control Interface-Unit (LGCIU) With Use of MCDU to Ensure that Continuous BITE is Operative

3. Fault Confirmation
Subtask 32-31-00-740-086-A

A. Test
(1) Do a BITE test with the VHF transceiver that shows the fault message AMM 23-12-00-740-001.
(2) If the test gives the message LGCIUx(5GAx)/VHFy(1RCy), do the procedure in Para. 4. A.

NOTE: x = 1 with y = 1, x = 2 with y = 2, x = 2 with y = 3.

4. Fault Isolation
Subtask 32-31-00-810-142-A

A. Procedure
(1) Do a BITE test of the applicable LGCIU AMM 32-69-00-740-001.
(2) If the test gives a fault message that includes the LGCIU, replace the applicable LGCIU-1 [5GA1] or LGCIU-2 [5GA2] , AMM 32-31-71-000-001 and AMM 32-31-71-400-001.
(3) If the test gives the message TEST OK:

do a check of the aircraft wiring between the applicable transceiver and the applicable LGCIU, ASM 231200, ASM 231200 or ASM 231200
repair all the unserviceable wiring and connectors
do the test in Para. 3.A.

(4) If the fault continues:

replace the applicable XCVR-VHF, 1 [1RC1] , XCVR-VHF, 2 [1RC2] or XCVR-VHF, 3 [1RC3] , AMM 23-12-33-000-001 and AMM 23-12-33-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:31:26 UTC