*** If the fault continues:
 **** replace the C/B-AIR COND AVNCS VENT/MONG (3HQ).

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

 * replace the FAN-BLOWER, AVNCS VENT (20HQ) (Ref. AMM TASK 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).
 (7) If the circuit breaker (1HQ) 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 blower fan (20HQ), pins A/J, A/K, A/L and the blower fan control-contactor (8HQ), pins T1, T2, T3 (Ref. ASM 21-26/03).
 1 If there is a short to ground:
_ - repair the related wiring.
 2 If there is no short to ground:
_
 - do a check for a short to ground at the wiring between the blower fan control-contactor (8HQ), pins L1, L2, L3, and the circuit breaker (1HQ) pins A2, B2, C2 (Ref. ASM 21-26/03).
 a If there is a short to ground:
_ - repair the related wiring.
 「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, 101-149, 151-199, 201-299, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 230
 May 01/05 CES c If the fault continues:

 b_ If there is no short to ground:
 - replace the FAN-BLOWER, AVNCS VENT (20HQ) (Ref. AMM TASK
 21-26-51-000-001) and (Ref. AMM TASK 21-26-51-400-001).

_
 - replace the CNTOR-BLOWER FAN CTL, AVNCS VENT (8HQ).
 (b) If the fault continues:
 - replace the C/B-AVNCS BLOWER FAN (1HQ).
 (8) If the fault continues:
 - replace the PRESS SW-BLOWER FAN, AVNCS VENT (17HQ) (Ref. AMM TASK 21-26-11-000-001) and (Ref. AMM TASK 21-26-11-400-001).
 (a) If the fault continues:
 - replace the PRESS SW-BLOWER FAN, AVNCS VENT (19HQ) (Ref. AMM TASK 21-26-11-000-001) and (Ref. AMM TASK 21-26-11-400-001).
 1 If the fault continues:
_
 - replace the filter assembly (Ref. AMM TASK 21-26-43-000-003) and (Ref. AMM TASK 21-26-43-400-003).
 **ON A/C ALL
 C. Do the operational test given in Para. 3.

 TASK 21-26-00-810-810
 Failure of the Extract Fan
 1. Possible Causes
_______________
 - FAN-EXTRACT, AVNCS VENT (18HQ)

 - AEVC (10HQ)

 - C/B-AVNCS EXTRACT FAN (2HQ)

 - CNTOR-EXTRACT FAN CTL, AVNCS VENT (7HQ)

 - FAN-EXTRACT, AVNCS VENT (18HQ)

 - C/B-AIR COND AVNCS VENT/MONG (6HQ)

 - PRESS SW-EXTRACT FAN, AVNCS VENT (30HQ)

 - VALVE-SKIN AIR OUTLET, AVNCS VENT (22HQ)

 - VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
21-26-00-810-816 Warning of the Extract-Fan Pressure Switch
 Inoperative AMM 21-26-00-710-001 Operational Check of System via MCDU AMM 21-26-00-710-008 Operational Test to Read the CFDS for CLASS 3 Faults
 of the AEVC AMM 21-26-00-710-009 Operational Test to Read the CFDS for LAST LEG REPORT of the AEVC AMM 21-26-11-000-001 Removal of the Blower and Extract Fan Pressure Switches (17HQ, 19HQ, 30HQ) AMM 21-26-11-400-001 Installation of the Blower and Extract Fan Pressure Switches (17HQ, 19HQ, 30HQ) 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 21-26-42-200-006 Check for Blockage of the Demister Filter with the Pressure Ports AMM 21-26-42-200-007 Check for Blockage of the Filter Cartridge with the
 Pressure Ports AMM 21-26-43-600-016 Discard Demister Filter AMM 21-26-43-600-017 Discard Filter Cartridge AMM 21-26-51-000-001 Removal of the Blower and Extract Fans (18HQ,20HQ) AMM 21-26-51-400-001 Installation of the Blower and Extract Fans (18HQ,
 20HQ) AMM 21-26-53-000-001 Removal of the Skin Air Outlet-Valve (22HQ) AMM 21-26-53-400-001 Installation of the Skin Air Outlet-Valve (22HQ) AMM 21-26-55-000-001 Removal of the Avionics Ventilation Skin Exchanger
 Inlet Bypass Valve (16HQ)
 「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 : ALL ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 232
 May 01/05 CES

 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
　
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