No AIDS Indication on MCDU1 or MCDU2

TASK 31-36-00-810-921-A
No AIDS Indication on MCDU1 or MCDU2

1. Possible Causes

DMU [1TV]
MCDU-1 [3CA1]
MCDU-2 [3CA2]
AIDS-software
DMU/FDIU (FDIMU) [10TV]
FDIMU (10TV) AIDS-software

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 31-36-00-810-801-A	DMU Inoperative
TSM TASK 31-36-00-810-865-A	DMU Receives No Data from MCDU 1 or MCDU 2
TSM TASK 31-36-00-810-898-A	FDIMU Inoperative
TSM TASK 31-36-00-810-918-A	FDIMU Receives No Data from MCDU 1 or MCDU 2
AMM 31-36-00-710-001	Test of the DMU
AMM 31-36-00-710-004	AIDS Software Load Procedure
AMM 31-36-00-710-013	FDIMU AIDS Software Load Procedure with the PDL
AMM 31-36-00-740-012	Test of the Flight Data Interface and Management Unit (FDIMU)

3. Fault Confirmation
Subtask 31-36-00-740-213-A ** ON A/C NOT FOR ALL

A. Test
(1) Reset the DMU:
(a) Open this(these) circuit breaker(s):

4TV.

(b) Wait for one minute.
(c) Close this(these) circuit breaker(s):

4TV.

(2) If the AIDS indication shows on the MCDU, no maintenance action is necessary.
(3) If the AIDS indication not shows on the MCDU, do the DMU fault monitoring test AMM 31-36-00-710-001.

Subtask 31-36-00-740-213-B ** ON A/C NOT FOR ALL

A. Test
(1) Reset the DMU:
(a) Open this(these) circuit breaker(s):

5TV.

(b) Wait for one minutes.
(c) Close this(these) circuit breaker(s):

5TV.

(2) If the AIDS indication shows on the MCDU, no maintenance action is necessary.
(3) If the AIDS indication not shows on the MCDU, do the FDIMU fault monitoring test (AIDS part) AMM 31-36-00-740-012.

4. Fault Isolation
Subtask 31-36-00-810-135-B ** ON A/C NOT FOR ALL

A. Procedure
(1) If the test gives a message related to a DMU failure:

Do the troubleshooting procedure of the DMU [1TV] (Ref. TSM TASK 31-36-00-810-801).

(2) If the test gives the message MCDU1 (3CA1)/DMU (1TV) and/or MCDU2 (3CA2)/DMU (1TV):

Do the troubleshooting procedure of the connection between the MCDU-1 [3CA1] and/or MCDU-2 [3CA2] and the DMU (Ref. TSM TASK 31-36-00-810-865).

(3) If the fault continues:

Do the AIDS-software load procedure AMM 31-36-00-710-004.

Subtask 31-36-00-810-135-C ** ON A/C NOT FOR ALL

A. Procedure
(1) If the test gives a message related to a FDIMU failure:

Do the troubleshooting procedure of the DMU/FDIU (FDIMU) [10TV] (Ref. TSM TASK 31-36-00-810-898).

(2) If the test gives the message MCDU1 (3CA1)/FDIMU (10TV) and/or MCDU2 (3CA2)/FDIMU (10TV):

Do the troubleshooting procedure of the connection between the MCDU-1 [3CA1] and/or MCDU-2 [3CA2] and the FDIMU (Ref. TSM TASK 31-36-00-810-918).

(3) If the fault continues:

Do the FDIMU (10TV) AIDS-software load procedure AMM 31-36-00-710-013.

Subtask 31-36-00-740-214-A

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

[Rev.8 from Aug 2018] 2026.04.04 04:30:07 UTC