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Loss of the HPTC Torque Motor Control through the two Channels on Engine 2
1. Possible Causes_______________
- ECU (4000KS)
- harness J7
- harness J8
- Hydromechanical Unit (HMU)
2. Job Set-up Information______________________
A. Referenced Information
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REFERENCE DESIGNATION
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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 73-21-50-000-041 Removal of the HJ8 Harness
AMM 73-21-50-400-040 Installation of the HJ7 Harness
AMM 73-21-50-400-041 Installation of the HJ8 Harness
AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS)
AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)(4000KS)
AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
ASM 73-25/18
3. Fault Confirmation__________________
A. Test
(1) Do the operational test of the FADEC 2A and 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation_______________
A. If the test gives the maintenance messages J7, HMU (HPTCTM), ECU + J8, HMU (HPTCTM), ECU:
- do a check for open or short to ground at pins J7/10, 23, 24 and J8/10, 23, 24 of the harnesses J7 and J8 between the ECU (4000KS) and the HPT torque-motor current in the HMU, (Ref. ASM 73-25/18).
(1) If one of these wirings is not correct:
- repair the defective harness J7 or J8.
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ECES E 56 E E E (2) If these wirings are correct:
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- disconnect the harnesses J7 and J8 from the ECU and do a check of the ECU cable resistance between: . pins 23 and 24 (17 to 23 Ohms) . pins 23 and 10 (> 10 Megohms) . pin 23 and the ground (> 10 Megohms).
(a) 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).
(b) If the resistance values are out of the specified limits:
- disconnect the harnesses J7 and J8 from the HMU and do a check of the HMU receptacle resistance between: . pins 23 and 24 (17 to 23 Ohms) . pins 23 and 10 (> 10 Megohms) . pin 23 and the ground (> 10 Megohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or the defective harness J8, (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
2 If the resistance values are out of the specified limits:
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- replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
B. Do the test given in Para. 3.A.(1).
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ECES TASK 73-29-00-810-852
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Loss of the BSV Solenoid Control through the two Channels on Engine 1
1. Possible Causes_______________
- ECU (4000KS)
- harness J7
- harness J8 中國航空網 m.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(104)
