W DOC AIRBUS | TSM A320F

Avionics Smoke Warnings Inoperative

TASK 26-15-00-810-801-A
Avionics Smoke Warnings Inoperative

1. Possible Causes
  • DET-SMOKE, AVNCS COMPT [1WA]
  • wiring of the 28VDC signal from the pin AA of the avionics compartment smoke detector (1WA) to the first terminal block
  • wiring of the ground signal at the avionics compartment smoke detector (1WA)
  • RELAY - SMOKE WARNING, AVNCS COMPT (2WA)
  • wiring of this relay
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-26-00-710-001
Operational Check of the Avionics Equipment Ventilation-System via MCDU
ASM 261501
AMM 26-15-15-000-001
Removal of the Smoke Detector - Avionics Compartment
AMM 26-15-15-400-001
Installation of the Smoke Detector - Avionics Compartment
3. Fault Confirmation
Subtask 26-15-00-710-050-A
A. Test
Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) AMM 21-26-00-710-001.
4. Fault Isolation
Subtask 26-15-00-810-050-A
A. If during the test, the SMOKE legend of the EMER ELEC PWR/GEN 1 LINE pushbutton switch and the FAULT legends of the VENTILATION/BLOWER and VENTILATION/EXTRACT pushbutton switches do not come on:
   (1) If the fault continues:
  • do a check of the wiring of the 28VDC signal from the pin AA of the avionics compartment smoke detector (1WA) to the first terminal block
  • do a check of the wiring of the ground signal at the avionics compartment smoke detector (1WA), pin A/B
    ASM 261501.
     (a) If there is no continuity:
  • repair the above wiring.
     (b) If there is continuity:
  • replace the RELAY - SMOKE WARNING, AVNCS COMPT (2WA).
       1 If the fault continues:
  • do a check and repair the wiring of this relay :
    from pin A/A2 to the ground point
    from pin A/X2 to the ground point
    from pin A/A1 to the first terminal block
    from pin A/X1 to the pin A/D of the avionics compartment smoke detector (1WA)
    ASM 261501.
Subtask 26-15-00-710-051-A
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:27:18 UTC
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