Loss of the DLRB Signal to the FMGC1

TASK 31-38-00-810-802-A
Loss of the DLRB Signal to the FMGC1

1. Possible Causes

wiring
ROUTING BOX-DATA LOADING [102TD]
FMGC-1 [1CA1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 22-70-00-610-008	Uploading of the FM Data
ASM 313801
AMM 31-38-34-000-001	Removal of the Data Loading Routing Box (DLRB)
AMM 31-38-34-400-001	Installation of the Data Loading Routing Box (DLRB)

3. Fault Confirmation
Subtask 31-38-00-710-051-A

A. Do the loading of the correct data base of the FMGC AMM 22-70-00-610-008.

4. Fault Isolation
Subtask 31-38-00-810-051-A

A. If the fault is identified by the crew observation:

FMGC1 uploading is not possible.
(1) Do a check for of the aircraft wiring between the ROUTING BOX-DATA LOADING [102TD] and FMGC-1 [1CA1] ASM 313801:
(a) pin B/50, 49 (102TD) to pin AB/11F, 11G (1CA1).
(b) pin A/50, 17 (102TD) to pin AA/12F, 12G (1CA1).
(c) pin A/33 (102TD) to pin AA/5A (1CA1).
(2) if the fault continues:

replace the ROUTING BOX-DATA LOADING [102TD] AMM 31-38-34-000-001 and AMM 31-38-34-400-001.

Subtask 31-38-00-710-052-A

B. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:30:08 UTC