Lavatory Smoke Detection Failed

TASK 26-17-00-810-824-A
Lavatory Smoke Detection Failed

1. Possible Causes

DIR-CIDS, 1 [101RH]
DIR-CIDS, 2 [102RH]
wiring

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
ASM 237301
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 26-17-00-710-094-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 26-17-00-810-130-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 26-17-00-810-131-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message
CIDS(102RH)-SDF2 BUS / CIDS(101RH)-SDF1
or
CIDS(101RH)-SDF1 BUS / CIDS(102RH)-SDF2
or
NO LAV DATA/CIDS(101RH)-SDF1 BUS/CIDS(102RH)-SDF2
or
NO LAV DATA/CIDS(102RH)-SDF2 BUS/CIDS(101RH)-SDF1:
(1) Replace the DIR-CIDS, 1 [101RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.
(2) If the fault continues:

Replace the DIR-CIDS, 2 [102RH] AMM 23-73-34-000-001 and AMM 23-73-34-400-001.

(3) If the fault continues:

Do a check and repair the wiring between the CIDS-SDF1 (AA15C and AA15H) and CIDS-SDF2 (AA11J and AA11K) ASM 237301.

(4) If the fault continues:

Do a check and repair the wiring between the CIDS-DIR1 (AA13A and AA13B) and CIDS-DIR2 (AA13E and AA13F) ASM 237301.

Subtask 26-17-00-710-095-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 26-17-00-860-071-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