Unexpected Lavatory Smoke-Detector

TASK 26-17-00-810-821-A
Unexpected Lavatory Smoke-Detector

1. Possible Causes

smoke detectors
MODULE-CABIN ASSIGNMENT [115RH]

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 23-73-19-000-002	Removal of the Cabin Assignment Module
AMM 23-73-19-400-002	Installation of the Cabin Assignment Module
ASM 261701

3. Fault Confirmation
Subtask 26-17-00-710-088-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 26-17-00-810-121-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 26-17-00-810-157-A ** ON A/C NOT FOR ALL

B. If the test gives this maintenance message WRG: SMK DET ADDRESS:
(1) If the test additionally gives a maintenance message WRG: CAN BUS/ SMK DET LAV x, check the pin programming of the related smoke detector, pins F,G,H,J,K,S and T ASM 261701

NOTE: x is the location of the related smoke detector.

(2) If the fault continues:

Do a check of the pin programming for all lavatory smoke detectors , pins F,G,H,J,K,S and T ASM 261701.

Subtask 26-17-00-810-122-A ** ON A/C NOT FOR ALL

C. If the test confirms the fault:

Make sure that the cabin assignment module (CAM) is applicable to the cabin layout (number and location of the lavatories),
Replace the MODULE-CABIN ASSIGNMENT [115RH] AMM 23-73-19-000-002 and AMM 23-73-19-400-002.

Subtask 26-17-00-710-089-A ** ON A/C NOT FOR ALL

D. Do the test as given in the Para. 3.

5. Close-up
Subtask 26-17-00-860-068-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:27:22 UTC