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(2) If the failure message HMU (OSG), J7 is not confirmed after re-start, but is repetitive:
(a) Disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment).
1 Visually examine the HMU receptacle and the HJ7 harness
_ connector for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or HMU receptacle is damaged:
_
- repair or replace as required.
b If no damage is found:
_ - reconnect the HJ7 harness.
R (b) If the HMU part number is 8061-512 (GE SPEC 1348M79P07):
- replace the main fuel pump (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
1 If the fault continues during the subsequent flights:
_
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
2 If the fault continues during the subsequent flights:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
3 If the fault continues during the subsequent flights:
_
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
R (c) If the HMU part number is 8061-526 (GE SPEC 1348M79P08) or R higher:
- remove the HMU (Ref. AMM TASK 73-21-10-000-002).
1 Inspect main fuel pump shaft.
_ a If damaged/broken or worn:
_
- replace the Main Fuel Pump (MFP) (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
b If not damaged/broken or worn:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
c If the fault continues during the subsequent flights:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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d If the fault continues during the subsequent flights:
_
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(3) If the failure message HMU (OSG), J7 is confirmed:
R (a) If the HMU part number is 8061-512 (GE SPEC 1348M79P07):
- remove the HMU (Ref. AMM TASK 73-21-10-000-002).
1 Inspect main fuel pump shaft.
_ a If damaged/broken or worn:
_
- replace the main fuel pump (Ref. AMM TASK 73-11-10-000-003) and (Ref. AMM TASK 73-11-10-400-003).
b If not damaged/broken or worn:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
2 If the fault continues during the subsequent flights:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
3 If the fault continues during the subsequent flights:
_
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
R (b) If the HMU part number is 8061-526 (GE SPEC 1348M79P08) or R higher:
- disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment)
- visually examine the HMU receptacle and the HJ7 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-001).
1 If harness connector or HMU receptacle is damaged:
_ - repair or replace as required.
2 If no damage is found:
_
- do an electrical resistance test through the HMU receptacle between: . pins 21 and 41 (< 5 ohms) . pins 21 and 8 (> 10 megohms) . pin 21 and the ground (> 10 megohms).
a If the resistance values are out of the specified limits:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
b If the resistance values are in the specified limits:
_ - reconnect the HJ7 harness
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本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(68)
