Unexpected Smoke Detector

TASK 26-17-00-810-830-A
Unexpected Smoke Detector

1. Possible Causes

smoke detector
DIR-CIDS, 1 [101RH]
DIR-CIDS, 2 [102RH]
connector AB
MODULE-CABIN ASSIGNMENT [115RH]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 237303
AMM 23-73-19-000-002	Removal of the Cabin Assignment Module
AMM 23-73-19-400-002	Installation of the Cabin Assignment Module
AMM 26-10-00-740-802	Ground Scanning of the Cabin Intercommunication Data-System (CIDS) - Smoke Detection Function (SDF)
ASM 261602
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 26-17-00-865-063-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 26-17-00-740-050-A ** ON A/C NOT FOR ALL

B. Test
(1) Open the circuit breakers 14WH, 15WH, 17WH and 18WH.
(2) After 10 seconds, close the circuit breakers again.
(3) 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 26-17-00-810-149-A ** ON A/C NOT FOR ALL

A. If the test gives a maintenance message which is different from the maintenance message given in Para 4.B.:

Do the trouble shooting procedure related to the maintenance message.

Subtask 26-17-00-810-150-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 x/ SMK DET FWD LDCC (yWH) or WRG: CAN BUS x/ SMK DET AFT LDCC (yWH), check the pin programming of the smoke detector yWH, pins F,G,H,J,K,S and T ASM 261602.

NOTE: yWH is the FIN of the related smoke detector.

(2) Do a check of the pin programming of the DIR-CIDS, 1 [101RH] and DIR-CIDS, 2 [102RH] connector AB , pins 11H, 12H, 11K,9H and 10H to the ground/ to open contact ASM 237303.
(3) If the fault continues:

Do a check of the pin programming for all smoke detectors, pins F,G,H,J,K,S and T connected to CAN Bus A and B ASM 261602.

(4) Do the test given in Para. 3.

Subtask 26-17-00-810-155-A ** ON A/C NOT FOR ALL

C. If the fault continues:
(1) Make sure that the Cabin Assignment Module (CAM) is applicable to the cabin layout (number and location of the lavatories).
(2) Replace the MODULE-CABIN ASSIGNMENT [115RH] AMM 23-73-19-000-002 and AMM 23-73-19-400-002.
(3) Do the test given in Para. 3.

Subtask 26-17-00-810-156-A ** ON A/C NOT FOR ALL

D. If the fault continues:
(1) Replace the related cargo-compartment smoke detector AMM 26-16-15-000-001 and AMM 26-16-15-400-001.

5. Close-up
Subtask 26-17-00-860-078-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