W DOC AIRBUS | TSM A320F

LDCC BTL 1 AFT SQUIB Fault

TASK 26-23-00-810-801-A
LDCC BTL 1 AFT SQUIB Fault

1. Possible Causes
  • CARTRIDGE AFT, BOTTLE 1
  • P/BSW DISCH 4WX
  • SDCU [10WQ]
  • wiring
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 26-17-34-000-001
Removal of the Smoke-Detection Control Unit (SDCU)
AMM 26-17-34-400-001
Installation of the Smoke-Detection Control Unit (SDCU)
AMM 26-23-00-710-001
Operational Test of the Cargo-Compartment Fire-Extinguishing System
ASM 262301
AMM 26-23-41-000-005
Removal of the Cartridge of the Cargo Fire-Extinguisher Bottle
AMM 26-23-41-400-005
Installation of the Cartridge of the Cargo Fire-Extinguisher Bottle
3. Fault Confirmation
Subtask 26-23-00-710-050-A ** ON A/C NOT FOR ALL
A. Do the operational test of the cargo-compartment fire-extinguishing system AMM 26-23-00-710-001.
4. Fault Isolation
Subtask 26-23-00-810-050-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 26-23-00-810-056-A ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message CRG FIRE BTL 1 AFT SQUIB:
   (1) If the fault continues:
  • do check of the P/BSW DISCH 4WX and replace it if necessary ASM 262301.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring between the:
    BOTTLE 1 (4005WX) connector A/B and SDCU (10WQ) connector AA/12A.
    BOTTLE 1 (4005WX) connector A/A and GND ASM 262301.
Subtask 26-23-00-810-056-E ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message CRG FIRE BTL 1 AFT SQUIB:
   (1) If the fault continues:
  • do check of the P/BSW DISCH 4WX and replace it if necessary ASM 262301.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring between the:
    BOTTLE 1 (4015WX) connector A/B and SDCU (10WQ) connector AA/12A.
    BOTTLE 1 (4015WX) connector A/A and GND ASM 262301.
Subtask 26-23-00-710-056-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
5. Close-up
Subtask 26-23-00-860-050-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:27:25 UTC
"WTRUIB" 2025