R 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 R (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
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A. Do the operational test of the FADEC 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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A. If the test gives the maintenance message BSV (VLV CLSD), HMU:
NOTE : If the ENG 2 CTL VALVE FAULT ECAM warning comes into view
____ simultaneously with this fault message, you must do a borescope inspection of the combustion chambers (Ref. AMM TASK 72-41-00-290-001) and the high-pressure turbine-nozzle assembly (Ref. AMM TASK 72-51-00-290-004) before the next flight.
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- disconnect the connector J8 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 6 and 7 (26 to 36 ohms) (Ref. ASM 73-25/18).
(1) If the resistance values are in the specified limits:
- replace the burner staging valve (BSV) (Ref. AMM TASK 73-11-70-000-002) and (Ref. AMM TASK 73-11-70-400-002).
(2) If the resistance values are out of the specified limits:
- disconnect the harness J8 from the HMU and do a check of the HMU resistance between: . pins 6 and 7 (26 to 36 ohms).
(a) If the resistance values are in the specified limits:
- replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
(b) If the resistance values are out of the specified limits:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues after the replacement of the BSV and the harness J8 and if the resistance checks are correct, the cause of the fault can be the hydraulic pressure control:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. If the test gives the maintenance message BSV (VLV OPEN), HMU: R
- disconnect the connector J8 from the ECU (4000KS) and do a check of the ECU cable resistance between: . pins 6 and 7 (26 to 36 ohms) (Ref. ASM 73-25/18).
(1) If the resistance values are in the specified limits:
- replace the burner staging valve (BSV) (Ref. AMM TASK 73-11-70-000-002) and (Ref. AMM TASK 73-11-70-400-002).
(2) If the resistance values are out of the specified limits:
- disconnect the harness J8 from the HMU and do a check of the HMU resistance between: . pins 6 and 7 (26 to 36 ohms).
(a) If the resistance values are in the specified limits:
- replace the harness J8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
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(b) If the resistance values are out of the specified limits:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues after the replacement of the BSV and the harness J8 and if the resistance checks are correct, the cause of the fault can be the hydraulic pressure control:
- replace the Hydromechanical Unit (HMU) (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(4) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
C. Do the test given in Para. 3.A.
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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(54)
