Both Smoke-Detectors of one AFT LDCC Cavity Inoperative

TASK 26-16-00-810-809-A
Both Smoke-Detectors of one AFT LDCC Cavity Inoperative

1. Possible Causes

AFT LDCC smoke-detectors

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 26-10-00-740-802	Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF)
AMM 26-16-15-000-001	Removal of the Cargo-Compartment Smoke Detectors
AMM 26-16-15-400-001	Installation of the Cargo-Compartment Smoke Detectors

3. Fault Confirmation
Subtask 26-16-00-865-055-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR COND/CIDS/SDF/DIR2 ESS	18WH	C06
49VU	AIR COND/CIDS/SDF/DIR1 ESS	15WH	C05
122VU	AIR COND/CIDS/SDF/DIR NORM/2	14WH	T18
122VU	AIR COND/CIDS/SDF/DIR NORM/1	17WH	T17

Subtask 26-16-00-710-066-A ** ON A/C NOT FOR ALL

B. Test
(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH, wait for approximately 10 seconds and close them again, wait for a minimum of 30 seconds before you start the test.
(2) After a minimum time of 30 seconds, do the Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF) AMM 26-10-00-740-802.

4. Fault Isolation
Subtask 26-16-00-810-069-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 26-16-00-810-079-A ** ON A/C NOT FOR ALL

B. If the test gives the maintenance message SMK DET AFT LDCC (XWH) and SMK DET AFT LDCC (YWH) (XWH,YWH = FINs of the two related smoke detectors of the same cavity):

replace the AFT LDCC smoke-detectors AMM 26-16-15-000-001 and AMM 26-16-15-400-001.

Subtask 26-16-00-710-075-A ** ON A/C NOT FOR ALL

C. Do the test given in Para. 3.

5. Close-up
Subtask 26-16-00-860-058-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.

[Rev.8 from Aug 2018] 2026.04.04 04:27:18 UTC