OBRM failure caused by FAP

TASK 23-73-00-810-941-A
OBRM failure caused by FAP

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 23-73-00-740-005	BITE-Test of the Cabin Intercommunication Data System (CIDS) through the CFDS
AMM 23-73-12-000-007	Removal of the Flight Attendant Panel
AMM 23-73-12-400-007	Installation of the Flight Attendant Panel
AMM 23-73-21-000-001	Removal of the On-Board Replaceable Module
AMM 23-73-21-400-001	Installation of the On-Board Replaceable Module
AMM 23-73-34-000-001	Removal of the CIDS Director
AMM 23-73-34-400-001	Installation of the CIDS Director

3. Fault Confirmation
Subtask 23-73-00-710-371-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the CIDS Interface and Power-Up Test via the CFDS AMM 23-73-00-740-005.

4. Fault Isolation
Subtask 23-73-00-810-706-A ** ON A/C NOT FOR ALL

A. If the test gives a different maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 23-73-00-810-707-A ** ON A/C NOT FOR ALL

B. If the test confirms the fault:

(1) If the fault continues:

Subtask 23-73-00-810-708-A ** ON A/C NOT FOR ALL

C. If the test gives the maintenance message OBRM/ FAP <NAME> (120RH) and OBRM/ DIR1 (101RH):

(1) If the fault continues:
replace the FAP [120RH] AMM 23-73-12-000-007 and AMM 23-73-12-400-007.
(a) If the fault continues:

5. Close-up
Subtask 23-73-00-710-372-A ** ON A/C NOT FOR ALL

A. Do the test given in para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:25:59 UTC