W DOC AIRBUS | TSM A320F

Loss of the ADIRU Buses that Supply the BSCU

TASK 32-51-00-810-832-A
Loss of the ADIRU Buses that Supply the BSCU

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-32-00-860-009
Procedure to Get Access to the SYSTEM REPORT/TEST/L/G Page
ASM 324202
AMM 32-42-34-000-001
Removal of the Braking/Steering Control Unit (BSCU)
AMM 32-42-34-400-001
Installation of the Braking/Steering Control Unit (BSCU)
AMM 32-46-00-740-001
BITE Test of the BSCU
AMM 32-46-00-740-002
BITE Test of the BSCU - Ground Scanning
AMM 34-12-34-000-001
Removal of the ADIRU
AMM 34-12-34-400-001
Installation of the ADIRU
AMM 34-14-00-740-004
SYSTEM TEST of the Inertial Reference (IR)
3. Fault Confirmation
Subtask 32-51-00-740-113-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do a check of the Post Flight Report (PFR) and make sure that the fault is shown.
   (2) Get access to the SYSTEM REPORT/TEST/L/G page for BSCU1 and BSCU2 AMM 31-32-00-860-009.
ACTION
RESULT
  • Push the line key adjacent to the BSCU1 or BSCU2 indication.
  • The BSCU1 or BSCU2 page comes into view.
  • Push the line key adjacent to the TROUBLE SHOOT DATA indication.
  • The TROUBLE SHOOTING DATA page comes into view.
   (3) Make sure that the TROUBLE SHOOTING DATA (TSD) gives fault code 7C.
     (a) If the fault occurred during flight phase 1, do the BITE test of the BSCU AMM 32-46-00-740-001.
       1 If the fault continues, do the Para. Fault Isolation.
     (b) If the fault occurred during flight phases 2 to 9, do the Para. Fault Isolation.
Subtask 32-51-00-740-113-B ** ON A/C NOT FOR ALL
A. Test
   (1) Do a check of the Post Flight Report (PFR) and make sure that the fault is shown.
   (2) Get access to the SYSTEM REPORT/TEST/L/G page for BSCU1 and BSCU2 AMM 31-32-00-860-009.
ACTION
RESULT
  • Push the line key adjacent to the BSCU1 or BSCU2 indication.
  • The BSCU1 or BSCU2 page comes into view.
  • Push the line key adjacent to the TROUBLE SHOOT DATA indication.
  • The TROUBLE SHOOTING DATA page comes into view.
   (3) Make sure that the TROUBLE SHOOTING DATA (TSD) gives fault code 968, 972, 976, 980 or 984.
     (a) If the fault occurred during flight phase 1, do the BITE test of the BSCU (GROUND SCANNING) AMM 32-46-00-740-002.
       1 If the fault continues, do the Para. Fault Isolation.
     (b) If the fault occurred during flight phases 2 to 9, do the Para. Fault Isolation.
4. Fault Isolation
Subtask 32-51-00-810-090-A ** ON A/C NOT FOR ALL
A. If there is the fault message BSCU: ADIRU 1, 2, 3:
   (1) Do the BITE test (System Test) of IR1, IR2 and IR3 AMM 34-14-00-740-004.
     (a) If the test gives a fault message related to ADIRU-1 [1FP1] , ADIRU-2 [1FP2] or ADIRU-3 [1FP3] :
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check and repair the wiring ASM 324202 if necessary between:
    * Pins AA/11J, 11H of the BSCU (10GG) and the first terminal block
    * Pins AA/10J, 10H of the BSCU (10GG) and the first terminal block
    * Pins AA/12J, 12H of the BSCU (10GG) and the first terminal block
    * Pins AA/12B, 12C of the BSCU (10GG) and the first terminal block.
Subtask 32-51-00-810-090-B ** ON A/C NOT FOR ALL
A. If there is the fault message ADIRU 1+2+3(1FP1+2+3)/BSCU(10GG):
   (1) Do the BITE test (System Test) of IR1, IR2 and IR3 AMM 34-14-00-740-004.
     (a) If the test gives a fault message related to ADIRU-1 [1FP1] , ADIRU-2 [1FP2] or ADIRU-3 [1FP3] :
   (2) If the fault continues:
   (3) If the fault continues:
  • Do a check and repair the wiring ASM 324202 if necessary between:
    * Pins AA/11J, 11H of the BSCU (10GG) and the first terminal block
    * Pins AA/10J, 10H of the BSCU (10GG) and the first terminal block
    * Pins AA/12J, 12H of the BSCU (10GG) and the first terminal block
    * Pins AA/12B, 12C of the BSCU (10GG) and the first terminal block.
[Rev.8 from Aug 2018] 2026.04.04 04:31:50 UTC
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