- disconnect the harness J7 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 J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or
(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 J7 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 J7 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).
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- disconnect the harness J7 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 J7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040) or
(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 J7 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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TASK 73-10-00-810-807
Feedback Disagree between the Signals of the Two Channels of the BSV on Engine
1. Possible Causes
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- burner staging valve (BSV)
- harness J11
- harness J12
- harness CJ11L
- harness CJ12L
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-11-70-000-002 Removal of the Burner Staging Valve (BSV)
AMM 73-11-70-400-002 Installation of the Burner Staging Valve (BSV)
AMM 73-21-50-000-025 Removal of the CJ11L Harness
AMM 73-21-50-000-027 Removal of the CJ12L Harness
AMM 73-21-50-000-044 Removal of the HJ11 Harness
AMM 73-21-50-000-045 Removal of the HJ12 Harness
AMM 73-21-50-400-025 Installation of the CJ11L Harness
AMM 73-21-50-400-027 Installation of the CJ12L Harness
AMM 73-21-50-400-044 Installation of the HJ11 Harness
AMM 73-21-50-400-045 Installation of the HJ12 Harness
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
AWM 71-51-08
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 1A 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, J11/J12, ECU:
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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(41)
