Loss of the DLRB Signal to the DMU

TASK 31-38-00-810-806-A
Loss of the DLRB Signal to the DMU

1. Possible Causes

wiring
ROUTING BOX-DATA LOADING [102TD]
DMU [1TV]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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 31-38-00-710-059-A ** ON A/C NOT FOR ALL

A. Do the loading of the correct data base of the DMU (Ref. AMM 31-36-00, P. Block 201).

4. Fault Isolation
Subtask 31-38-00-810-055-A ** ON A/C NOT FOR ALL

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

DMU uploading is not possible.
(1) Do a check for of the aircraft wiring between the ROUTING BOX-DATA LOADING [102TD] and DMU [1TV] ASM 313801:

A/32 (102TD) to pin AA/14G (1TV).

(2) Do a check for of the aircraft wiring between the DMU [1TV] and the ROUTING BOX-DATA LOADING [102TD] :
(a) pin AB/11C, 11D (1TV) to the pin A/ 49, 16 (102TD).
(b) pin AA/11C, 11D (1TV) to the pin B/ 17, 33 (102TD).
(3) 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 31-38-00-710-060-A ** ON A/C NOT FOR ALL

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

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