- repair the related wiring.

 (b) If there is a ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the skin exchanger-outlet bypass valve (23HQ), pin AB/6A and pin A/J and/or pin AB/6B and pin A/M.
 1 If the fault continues:
_
 - do a check and repair the wiring from the AEVC (10HQ) to the skin exchanger-outlet bypass valve (23HQ), pin AA/6A to pin A/A and/or pin AA/6B to pin A/C.
 a If the fault continues:
_
 - replace the VALVE-SKIN EXCHANGER OUTLET BYPASS, AVNCS VENT (23HQ) (Ref. AMM TASK 21-26-55-000-003) and (Ref. AMM TASK 21-26-55-400-003).
 (3) If the fault continues:
 - replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-55-400-001).

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 OUTLET BYPASS V 23HQ:
 - 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 skin exchanger-outlet bypass valve (23HQ) microswitches, between pin A/J and pin A/G and between pin A/M and pin A/K.

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

 - replace the VALVE-SKIN EXCHANGER OUTLET BYPASS, AVNCS VENT (23HQ) (Ref. AMM TASK 21-26-55-000-003) and (Ref. AMM TASK 21-26-55-400-003).

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

 - do a check for a ground signal at pin A/U, pin A/G, and pin A/K of the skin exchanger-outlet bypass valve (23HQ) (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 skin exchanger-outlet bypass valve (23HQ), pin AB/6A and pin A/J and/or pin AB/6B and pin A/M.
 1 If the fault continues:
_
 - do a check and repair the wiring from the AEVC (10HQ) to the skin exchanger-outlet bypass valve (23HQ), pin AA/6A to pin A/A and/or pin AA/6B to pin A/C.
 a If the fault continues:
_
 - replace the VALVE-SKIN EXCHANGER OUTLET BYPASS, AVNCS VENT (23HQ) (Ref. AMM TASK 21-26-55-000-003) and (Ref. AMM TASK 21-26-55-400-003).
 (3) If the fault continues:
 - replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-55-400-001).
 **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 263
 May 01/05 CES

 TASK 21-26-00-810-821

 Loss of the Information from the LGCIUs
 1. Possible Causes
_______________
 - AEVC (10HQ)

 - LGCIU-1 (5GA1)

 - LGCIU-2 (5GA2)

 - wiring between the AEVC (10HQ) and the LGCIU-1 (5GA1)

 - wiring between the AEVC (10HQ) and the LGCIU-2 (5GA2)

 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 32-31-71-000-001 Removal of the LGCIU (5GA1, 5GA2)
 AMM 32-31-71-400-001 Installation of the LGCIU (5GA1, 5GA2)
 ASM 21-26/02

 3. Fault Confirmation
__________________
 A. Test
 (1) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 21-26-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message CHECK LGCIU - AEVC INTFC:
 - do a check for a ground signal at pin AB/9C and pin AB/10C of the AEVC (10HQ).
 (1) If there is a ground signal:

 - replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).

 (2) If there is no ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the LGCIU-1 (5GA1), pins AB/9C and pins AB/1D and/or do a check and repair the wiring between the AEVC (10HQ) and the LGCIU-2 (5GA2) , pins AB/10C and pins AB/1D (Ref. ASM 21-26/02).
　
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