W DOC AIRBUS | TSM A320F

LDCC BTL 1 Low Pressure

TASK 26-23-00-810-803-A
LDCC BTL 1 Low Pressure

1. Possible Causes
  • BOTTLE-FIRE EXTING [4005WX]
  • P/BSW-CARGO SMOKE/TEST [13WH]
  • SDCU [10WQ]
  • wiring
  • FIRE EXTINGUISHER [4015WX]
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 26-23-00-200-005
Restoration of the Fire Extinguishing System (FES) after Activation
AMM 26-23-00-710-001
Operational Test of the Cargo-Compartment Fire-Extinguishing System
ASM 262301
AMM 26-23-41-000-004
Removal of the Cargo Fire-Extinguisher Bottle
AMM 26-23-41-400-004
Installation of the Cargo Fire-Extinguisher Bottle
3. Fault Confirmation
Subtask 26-23-00-710-052-A ** ON A/C NOT FOR ALL
A. Do the operational test of the cargo-compartment fire-extinguish system AMM 26-23-00-710-001.
4. Fault Isolation
Subtask 26-23-00-810-052-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 26-23-00-810-058-A ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message CRG FIRE BTL 1 LO PR:
   (1) Replace the BOTTLE-FIRE EXTING [4005WX] AMM 26-23-41-000-004 and AMM 26-23-41-400-004.
     (a) If the bottle released thru the diaphragm, do the restoration of the fire extinguishing system AMM 26-23-00-200-005.
     (b) If the bottle did not release thru the diaphragm, replace the bottle only.
   (2) If the fault continues:
  • Do a check of the P/BSW-CARGO SMOKE/TEST [13WH] and replace it if necessary ASM 262301.
   (3) If the fault continues:
   (4) If the fault continues:
     (a) Do a check and repair the wiring between:
  • The BOTTLE 1 (4005WX) connector B/C and the SW (13WH) pin 1
  • The SW (13WH) pin 2 and the SDCU (10WQ) connector AA/13A
  • The BOTTLE 1 (4005WX) connector B/A and the GND ASM 262301.
Subtask 26-23-00-810-058-E ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message CRG FIRE BTL 1 LO PR:
   (1) Replace the FIRE EXTINGUISHER [4015WX] AMM 26-23-41-000-004 and AMM 26-23-41-400-004.
     (a) If the bottle released thru the diaphragm, do the restoration of the fire extinguishing system AMM 26-23-00-200-005.
     (b) If the bottle did not release thru the diaphragm, replace the bottle only.
   (2) If the fault continues:
  • Do a check of the P/BSW-CARGO SMOKE/TEST [13WH] and replace it if necessary ASM 262301.
   (3) If the fault continues:
   (4) If the fault continues:
     (a) Do a check and repair the wiring between:
  • The BOTTLE 1 (4015WX) connector B/C and the SW (13WH) pin 1
  • The SW (13WH) pin 2 and the SDCU (10WQ) connector AA/13A
  • The BOTTLE 1 (4015WX) connector B/A and the GND ASM 262301.
Subtask 26-23-00-710-058-A ** ON A/C NOT FOR ALL
C. Do the test given in Para. 3.
5. Close-up
Subtask 26-23-00-860-052-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
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