** If there is a short to ground:
 *** repair the related wiring.

 ** If there is no short to ground:
 *** replace the C/B-AIR COND AVNCS VENT/MONG (6HQ).

 . If there is 28VDC, make sure that the warning light of
 the extract fan (18HQ)is off.

 * If the warning light is on, push the RESET pushbutton switch on the extract fan (18HQ).
 NOTE : The fan can operate immediately.
____ The warning light goes off.
 ** If the fault continues, replace the FAN-EXTRACT, AVNCS VENT (18HQ).
 * If the fault continues, do a check for 28VDC at pin AA/9A of the AEVC (10HQ).
 ** If there is 28VDC:
 *** replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).

 ** If there is no 28VDC:
 *** do a check and repair the wiring between the AEVC
 (10HQ), pin AA/9A and the extract fan control-contactor
 (7HQ), pin Z and between the extract fan control-contactor
 (7HQ), pin X and the extract fan (18HQ), pin A/D (Ref. ASM
 21-26/02).

 *** If the fault continues:
 **** replace the CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ).

 ***** If the fault continues:
 ****** replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM
 TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).

 b If the circuit breaker (6HQ) is open:
_ - close the circuit breaker.
 . If the circuit breaker trips:
 * do a check for a short to ground at the wiring between the extract fan (18HQ), pin A/E and the circuit breaker (6HQ) (Ref. ASM 21-26/02).
 ** If there is a short to ground:
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 240
 201-299, May 01/05 CES

 *** repair the related wiring.

 ** If there is no short to ground:
 *** replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM
 TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).

 *** If the fault continues:
 **** replace the C/B-AIR COND AVNCS VENT/MONG (6HQ).

 . If the circuit breaker stays closed and the fault
 continues:

 * replace the FAN-EXTRACT, AVNCS VENT (18HQ) (Ref. AMM TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).
 (6) If the circuit breaker (2HQ) is open:
 - close the circuit breaker.
 (a) If the circuit breaker trips:
 - do a check for a short to ground at the wiring between the extract fan (18HQ), pins A/J, A/K, A/L and the extract fan control-contactor (7HQ), pins L1, L2, L3 and the circuit breaker (2HQ) pins A2, B2, C2 (Ref. ASM 21-26/02).
 1 If there is a short to ground:
_ - repair the related wiring.
 2 If there is no short to ground:
_ - replace the CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ).
 (b) If the fault continues:
 - replace the C/B-AVNCS EXTRACT FAN (2HQ).
 (7) If the fault continues:
 - replace the PRESS SW-EXTRACT FAN, AVNCS VENT (30HQ) (Ref. AMM TASK 21-26-11-000-001) AND (Ref. AMM TASK 21-26-11-400-001).
 **ON A/C ALL
 C. Do the operational test given in Para. 3.
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 241
 May 01/05R CES

 TASK 21-26-00-810-811
 Failure of the Smoke Detector
 1. Possible Causes
_______________
 - AEVC (10HQ)

 - DET-SMOKE, AVNCS COMPT (1WA)

 - RELAY-SMOKE WARNING, AVNCS COMPT (2WA)

 - C/B-AIR COND AVNCS VENT/CTL (5HQ)

 - wiring between pin A/A of the smoke detector (1WA) and the circuit breaker (5HQ

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 21-26-00-710-001 Operational Check of System via MCDU AMM 21-26-34-000-001 Removal of the Avionics Equipment Ventilation Computer (AEVC) (10HQ) AMM 21-26-34-400-001 Installation of the Avionics Equipment Ventilation Computer (AEVC) (10HQ) AMM 26-15-15-000-001 Removal of the Smoke Detector (1WA) - Avionics Compartment AMM 26-15-15-400-001 Installation of the Smoke Detector (1WA) - Avionics
　
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