B. Do the operational test given in Para. 3.
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CES
TASK 21-26-00-810-820
Failure of the Skin Exchanger-Outlet Bypass Valve
1. Possible Causes_______________
- AEVC (10HQ)
- CARTRIDGE-AVNCS VENT FILTER (2082HM)
- VALVE-SKIN EXCHANGER OUTLET BYPASS, AVNCS VENT (23HQ)
- wiring between the AEVC (10HQ) and the skin exchanger-outlet bypass valve (23HQ)
- wiring from the AEVC (10HQ) to the skin exchanger-outlet bypass valve (23HQ)
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 21-26-43-920-001 Replacement of the Filter Cartridge
AMM 21-26-55-000-003 Removal of the Avionics Ventilation Skin Exchanger Outlet Bypass Valve (23HQ)
AMM 21-26-55-400-001 Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve (16HQ)
AMM 21-26-55-400-003 Installation of the Avionics Ventilation Skin Exchanger Outlet Bypass Valve (23HQ)
ASM 21-26/03
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).
「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 261
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CES 4. Fault Isolation
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R **ON A/C 001-049, 051-099, 101-105, 301-399, 401-499,
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 it.
- 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:
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