W DOC AIRBUS | TSM A320F

Failure of the BSV Closed on Engine 1

TASK 73-10-00-810-847-A
Failure of the BSV Closed on Engine 1

1. Possible Causes
  • J14 Identification Connector
  • burner staging valve
  • harness HJ7
  • harness HJ8
  • HMU
  • ECU [4000KS]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 72-41-00-290-001
Borescope Inspection of the Combustion Chamber Liners, Dome Areas, HPT 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 Selection Valve (BSV) for SAC Engines
AMM 73-11-70-400-002
Installation of the Burner Selection Valve (BSV) for SAC Engines
AMM 73-21-10-000-001
Removal of the Hydromechanical Unit (HMU)
AMM 73-21-10-400-001
Installation of the Hydromechanical Unit (HMU)
AMM 73-21-50-000-040
Removal of the HJ7 Harness for SAC Engines
AMM 73-21-50-000-041
Removal of the HJ8 Harness for SAC Engines
AMM 73-21-50-400-040
Installation of the HJ7 Harness for SAC Engines
AMM 73-21-50-400-041
Installation of the HJ8 Harness for SAC Engines
AMM 73-21-60-000-001
Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001
Installation of the Electronic Control Unit (ECU)
AMM 73-21-90-000-002
Removal of the Engine Identification Connector
AMM 73-21-90-400-002
Installation of the Engine Identification Connector
AMM 73-21-90-860-001
Programming of the Identification Plug (Push-Pull Design) for SAC engines
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
3. Fault Confirmation
Subtask 73-10-00-710-136-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the FADEC on the ground (with engine motoring) AMM 73-29-00-710-040.
4. Fault Isolation
Subtask 73-10-00-810-108-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message BSV(CL), J14(WRONG):
  • Verify the nameplate of the engine:
   (1) If the nameplate is for a DAC engine:
  • verify that a DAC ID plug is installed
NOTE: The ID plug can be checked on the MCDU screen. Access reporting functions, then select the LRU Idenfication screen.
Line 4 of the LRU Identification screen will display:
  • "EGT MON" or "SAC CONFIG" for a SAC ID plug
  • "DAC CONFIG" for a DAC ID plug
     (a) Replace the J14 Identification Connector AMM 73-21-90-000-002 AMM 73-21-90-400-002 or Do a Re-programming of the Identification Connector (Push-pull Design only) AMM 73-21-90-860-001.
   (2) If the nameplate is for a SAC engine:
     (a) Do a borescope inspection of the combustion chamber AMM 72-41-00-290-001 and the high pressure turbine nozzle assembly AMM 72-51-00-290-004.
     (b) Disconnect the cables HJ7 and HJ8 from the ECU and do a check of the cable resistance between:
. pins 6 and 7 (26 to 36 ohms)
       1 If the resistance value is in specified limits:
         a If the burner staging valve has been deleted:
  • No more action is necessary.
         b If the burner staging valve is installed:
       2 If the resistance value are out of specified limits:
  • Disconnect the cables HJ7 and HJ8 from the HMU and do a check of the HMU resistance between:
    . pins 6 and 7 (26 to 36 ohms)
         a If the resistance value are in specified limits:
         b If the resistance value are out of specified limits:
   (3) if the fault continues, replace the ECU [4000KS] AMM 73-21-60-000-001 AMM 73-21-60-400-001.
Subtask 73-10-00-710-137-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.A.
[Rev.8 from Aug 2018] 2026.04.04 04:35:17 UTC
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