- 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 J7 from the HMU and do a check of the HMU resistance between: . pins 6 and 7 (26 to 36 ohms).
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- replace the defective 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 73-10-00-810-806
Failure of the BSV Valve on Engine 2
1. Possible Causes
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- burner staging valve (BSV)
- harness J7
- Hydromechanical Unit (HMU)
- ECU (4000KS)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 72-41-00-290-001 Borescope Inspection of the Combustion Chamber Liners, Dome Areas,High Pressure Turbine Nozzle Vanes and Shrouds (as far as visible through two opposite ports)
AMM 72-51-00-290-004 Borescope Inspection of High-Pressure Turbine Nozzle
Assembly
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 73-21-10-000-002 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 73-21-50-400-040 Installation of the HJ7 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
3. Fault Confirmation
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A. Do the operational test of the FADEC 2A on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
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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.
- 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).
(2) If the resistance values are out of the specified limits: 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(40)
