(1) If the status of the microswitch between the pin A/J and the pin A/G is equivalent to the status of the microswitch between the pin A/M and the pin A/K:

 - replace the VALVE-COND AIR INLET, AVNCS VENT (21HQ) (Ref. AMM TASK 21-26-54-000-001) and (Ref. AMM TASK 21-26-54-400-001).

 (2) If the status of the microswitch between the pin A/J and the pin A/G is not equivalent to the status of the microswitch between the pin A/M and the pin A/K:

 - do a check for a ground signal at pin A/U, pin A/G, pin A/K of the conditionned air-inlet valve (21HQ) (Ref. ASM 21-26/03).
 (a) If there is no ground signal:

 - repair the related wiring.

 (b) If there is a ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the conditioned air-inlet valve (21HQ) , pin AB/7A and pin A/J and/or pin AB/7B and pin A/M.
 1 If the fault continues:
_
 - do a check and repair the wiring between the AEVC (10HQ) and the conditioned air-inlet valve (21HQ), pin AA/7A and pin A/A and/or pin AA/7B and pin A/C.
 a If the fault continues:
_
 - replace the VALVE-COND AIR INLET, AVNCS VENT (21HQ) (Ref. AMM TASK 21-26-54-000-001) and (Ref. AMM TASK 21-26-54-400-001). . If the fault continues:
 * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
R **ON A/C 001-049, 101-149, 151-199, 201-299,
R Post SB 21-1087 For A/C 001-049,101-105,
 A. If the test gives the maintenance message COND AIR INLET V 21HQ:
 - make sure that the avionics ventilation filter is not clogged. If necessary, replace the CARTRIDGE-AVNCS VENT FILTER (2082HM) (Ref. AMM TASK 21-26-43-920-001).

 - do a check of the status of the conditioned air-inlet valve (21HQ) microswitches, between pin A/J and pin A/G and between pin A/M and pin A/K (Ref. ASM 21-26/03).

 (1) If the status of the microswitch between the pin A/J and the pin A/G is equivalent to the status of the microswitch between the pin A/M and the pin A/K:
 - replace the VALVE-COND AIR INLET, AVNCS VENT (21HQ) (Ref. AMM TASK 21-26-54-000-001) and (Ref. AMM TASK 21-26-54-400-001).
 「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 216
 May 01/05 CES

 (2) If the status of the microswitch between the pin A/J and the pin A/G is not equivalent to the status of the microswitch between the pin A/M and the pin A/K:
 - do a check for a ground signal at pin A/U, pin A/G, pin A/K of the conditionned air-inlet valve (21HQ) (Ref. ASM 21-26/03).
 (a) If there is no ground signal:

 - repair the related wiring.

 (b) If there is a ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the conditioned air-inlet valve (21HQ) , pin AB/7A and pin A/J and/or pin AB/7B and pin A/M.
 1_ If the fault continues:
 - do a check and repair the wiring between the AEVC (10HQ) and
 the conditioned air-inlet valve (21HQ), pin AA/7A and pin
 A/A and/or pin AA/7B and pin A/C.

 a If the fault continues:
_
 - replace the VALVE-COND AIR INLET, AVNCS VENT (21HQ) (Ref. AMM TASK 21-26-54-000-001) and (Ref. AMM TASK 21-26-54-400-001). . If the fault continues:
 * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
 **ON A/C ALL
 B. 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 217
 May 01/05R
 CES

 TASK 21-26-00-810-806

 Failure of the Skin Exchanger-Inlet Bypass Valve
 1. Possible Causes
_______________
 - AEVC (10HQ)

 - CARTRIDGE-AVNCS VENT FILTER (2082HM)

 - VALVE-SKIN EXCHANGER INLET BYPASS AVNCS VENT (16HQ)

 - wiring between the AEVC (10HQ) and the skin exchanger-inlet bypass valve (16HQ)

 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 21-26-43-920-001 Replacement of the Filter Cartridge AMM 21-26-55-000-001 Removal of the Avionics Ventilation Skin Exchanger
　
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