Engine non Motoring)
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 2A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. This fault is generated if there is an open or short to ground in the VBV torque motor current loop on channel A.
(1) If the failure message J7, HMU(VBV TM), ECU is not confirmed:
- no maintenance action is required.
(2) If the failure message J7, HMU(VBV TM), ECU is not confirmed, but is repetitive:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(a) 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).
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- 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 J7, HMU(VBV TM), ECU is confirmed:
(a) Disconnect the HJ7 harness from the ECU (4000KS) receptacle.
1 Visually examine the ECU (4000KS) receptacle and the HJ7
_ harness connector for damaged pins and contamination (Ref. AMM TASK 73-21-50-210-001).
a If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
b If no damage is found:
_
- do an electrical resistance test through the HJ7 harness between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 and the ground (> 10 megohms).
c If the resistance values are in the specified limits:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
d If the resistance values are out of the specified limits:
_
- reconnect the HJ7 harness to the ECU (4000KS).
(b) Disconnect the HJ7 harness from the HMU receptacle (HMU-A) (located in the left core compartment).
1 Visually examine the HJ7 harness connector and the HMU
_ receptacle for damaged pins and contamination (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:
_
- do an electrical resistance test through the HMU receptacle between: . pins 29 and 30 (17 to 23 ohms) . pins 29 and 13 (> 10 megohms) . pin 29 and the ground (> 10 megohms).
c 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).
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_
- replace the HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 73-29-00-810-891
Loss of the VBV Torque Motor Control - Engine 2 - Channel B
1. Possible Causes
_______________
- ECU (4000KS)
- Hydromechanical Unit (HMU)
- HJ8 harness
2. Job Set-up Information
______________________
A. Referenced Information
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發動機燃油和控制 2(141)
