TASK 21-26-00-810-807
Failure of the Skin Exchanger Isolation-Valve
1. Possible Causes
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- AEVC (10HQ)
- VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ)
- wiring between the AEVC (10HQ) and the skin exchanger isolation-valve (24HQ)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 21-26-00-710-001 Operational Check of System via MCDU AMM 21-26-55-000-001 Removal of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve (16HQ) AMM 21-26-55-400-001 Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve (16HQ) ASM 21-26/02
3. Fault Confirmation
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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
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A. If the test gives the maintenance message ISOL V 24HQ:
- do a check of the status of the skin exchanger isolation-valve (24HQ) microswitches, between pin A/J and pin A/G and between pin A/M and pin A/K (Ref. ASM 21-26/02).
(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-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).
(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 skin exchanger isolation-valve (24HQ) (Ref. ASM 21-26/02).
「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 221
May 01/05R CES
(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 isolation-valve (24HQ), pin AB/5A and pin A/J and/or pin AB/5B and pin A/M (Ref. ASM 21-26/02).
1 If the fault continues:
_
- do a check and repair the wiring between the AEVC (10HQ) and R the skin exchanger isolation-valve (24HQ), pin AA/5A and pin R A/A and/or pin AA/5B and pin A/C (Ref. ASM 21-26/02).
a If the fault continues:
_
- replace the VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001). . If the fault continues:
* replace the AEVC (10HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).
B. Do the operational test given in Para. 3.
TASK 21-26-00-810-809
Failure of the Blower Fan
1. Possible Causes
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- FAN-BLOWER, AVNCS VENT (20HQ)
- AEVC (10HQ)
- PRESS SW-BLOWER FAN, AVNCS VENT (17HQ)
- CARTRIDGE-AVNCS VENT FILTER (2082HM)
- VALVE-SKIN AIR INLET, AVNCS VENT (15HQ)
- VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ)
- SENSOR-DUCT TEMP, AVNCS VENT (26HQ)
- wiring between the blower fan control-contactor (8HQ) and the circuit breaker (1HQ)
- C/B-AVNCS BLOWER FAN (1HQ)
- C/B-AIR COND AVNCS VENT/MONG (3HQ)
- CNTOR-BLOWER FAN CTL, AVNCS VENT (8HQ)
- PRESS SW-BLOWER FAN, AVNCS VENT (19HQ)
- DEMISTER-AVNCS VENT FILTER (2081HM)
- CARTRIDGE-AVNCS VENT FILTER (2082HM)
- HOUSING-AVNCS VENT FILTER (2083HM)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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21-26-00-810-814 Warning of the Blower-Fan Pressure Switch Inoperative 21-26-00-810-815 Warning of the Blower-Fan Pressure Switch Inoperative 21-26-00-810-818 Warning of the Duct Temperature Sensor 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
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