- ECU (4000KS)
- HJ7 harness
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-00-00-710-003 Engine Automatic Start AMM 73-11-10-000-003 Removal of the Fuel Pump and Filter Assembly AMM 73-11-10-400-003 Installation of the Fuel Pump and Filter Assembly AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-210-001 Visual Inspection of the Wiring Harness AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
3. Fault Confirmation
__________________
A. Perfom an engine start (Ref. AMM TASK 71-00-00-710-003).
4. Fault Isolation
_______________
A. This fault is generated if an Overspeed Governor (OSG) switch position
fault is detected during an engine start. This fault can be caused by a R failed switch in the HMU, an open or short circuit in the HJ7 harness, R low fuel pressure to the HMU, or a failed main fuel pump shaft.
(1) If the failure message HMU (OSG), J7 occurs during an engine start:
- restart the engine to confirm the fault (Ref. AMM TASK 71-00-00-710-003).
(a) If the fault does not repeat:
- no maintenance action is required.
F 『 EEFF : ALL E ∞∞73-20-00∞∞∞∞∞∞∞∞∞∞Page 201
E E Aug 01/99 E E ECES
E
F 『
E C F M E
E E
E 56 E
E E
(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).
F 『 EEFF : ALL E ∞∞73-20-00∞∞∞∞∞∞∞∞∞∞Page 202
E E May 01/00 E E ECES
E
F 『
E C F M E
E E
E 56 E
E E
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).
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机燃油和控制 1(66)
