W DOC AIRBUS | TSM A320F

Fault of the APU Bleed Supply

TASK 36-12-00-810-801-A
Fault of the APU Bleed Supply

1. Possible Causes
  • APU
  • P/BSW-AIR COND/APU BLEED [5HV]
  • wiring
  • ELECTRONIC CONTROL BOX [59KD]
  • BMC-1 [1HA1]
  • BMC-2 [1HA2]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
ESPM 205321
AMM 24-41-00-861-002
Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002
De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-32-00-860-804
Procedure to Get Access to the SYSTEM REPORT/TEST/APU Page
AMM 31-60-00-860-001
EIS Start Procedure
AMM 36-11-34-000-001
Removal of the BMC
AMM 36-11-34-400-001
Installation of the BMC
ASM 361201
AMM 49-00-00-710-005
Self-Test of the ECB
AMM 49-00-00-710-009
Self-Test of the ECB
AMM 49-00-00-860-005
APU Start by External Power
AMM 49-00-00-860-006
APU Shutdown by External Power
AMM 49-00-00-860-008
APU Start by External Power
AMM 49-00-00-860-009
APU Shutdown by External Power (131-9(A))
AWM 496102
AMM 49-61-34-000-002
Removal of the Electronic Control Box (ECB) (APS 3200)
AMM 49-61-34-000-003
Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-002
Installation of the Electronic Control Box (ECB) (APS 3200)
AMM 49-61-34-400-003
Installation of the Electronic Control Box (ECB) (131-9(A))
3. Fault Confirmation
Subtask 36-12-00-865-050-A ** ON A/C NOT FOR ALL
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUAIR BLEED/X FEED/VALVE/BAT2HVD13
49VUAIR BLEED/ENG 1/CTL3HA1D12
49VUAIR BLEED/ENG 1/MONG2HA1D11
121VUAPU/APU/CTL2KDL42
121VUAPU/ECB/SPLY1KDL41
122VUAIR BLEED/ENG 2/CTL3HA2Z23
122VUAIR BLEED/ENG 2/MONG2HA2Z22
122VUAIR BLEED/X FEED VALVE/NORM1HVZ20
Subtask 36-12-00-860-050-A ** ON A/C NOT FOR ALL
B. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
   (2) Do the EIS start procedure AMM 31-60-00-860-001.
   (3) On panel 30VU, make sure that the OFF legends on the PACK 1 and PACK 2 pushbutton switches are on.
Subtask 36-12-00-710-050-B ** ON A/C NOT FOR ALL
C. Test
ACTION
RESULT
1.Do the self test of the ECB AMM 49-00-00-710-005.
2.Start the APU AMM 49-00-00-860-005.
3.On the panel 30VU:
  • push the APU BLEED pushbutton switch.
On the panel 30VU:
  • the ON legend on the APU BLEED pushbutton switch comes on.
NOTE: The APU supplies bleed-air after approx. 5 seconds.

On the SD:
  • the APU bleed-valve symbol shows the APU bleed valve in the open (GREEN) position.
4.On the MCDU:
On the MCDU:
  • The APU LAST LEG/PREVIOUS LEG report comes into the view.
Do a check for fault messages and/or warning messages.
  • If fault message or warning message is/are shown, record it.
5.On the panel 30VU:
  • push the APU BLEED pushbutton switch.
On the panel 30VU:
  • the ON legend on the APU BLEED pushbutton switch goes off.

On the SD:
  • the APU bleed-valve symbol shows the APU bleed valve in the closed (GREEN) position.
6.Stop the APU AMM 49-00-00-860-006.
Subtask 36-12-00-710-050-C ** ON A/C NOT FOR ALL
C. Test
ACTION
RESULT
1.Do the self test of the ECB AMM 49-00-00-710-009.
2.Start the APU AMM 49-00-00-860-008.
3.On the panel 30VU:
  • push the APU BLEED pushbutton switch.
On the panel 30VU:
  • the ON legend on the APU BLEED pushbutton switch comes on.
NOTE: The APU supplies bleed-air after approx. 5 seconds.

On the SD:
  • the APU bleed-valve symbol shows the APU bleed valve in the open (GREEN) position.
4.On the MCDU:
On the MCDU:
  • The APU LAST LEG/PREVIOUS LEG report come into the view.
Do a check for fault messages and/or warning messages.
  • If fault message or warning message is/are shown, record it.
5.On the panel 30VU:
  • push the APU BLEED pushbutton switch.
On the panel 30VU:
  • the ON legend on the APU BLEED pushbutton switch goes off.

On the SD:
  • the APU bleed-valve symbol shows the APU bleed valve in the closed (GREEN) position.
6.Stop the APU AMM 49-00-00-860-009.
4. Fault Isolation
Subtask 36-12-00-810-061-A ** ON A/C NOT FOR ALL
A. Troubleshoot the Maintenance Message/s given by the APU self test.
   (1) Do the test given in Para. 3.
Subtask 36-12-00-810-051-B ** ON A/C NOT FOR ALL
B. Maintenance Action
   (1) If the APU LAST LEG/PREVIOUS LEG report shows some fault message or warning message:
     (a) Do the troubleshooting related to the fault shown
   (2) If the fault continues:
     (a) Replace the P/BSW-AIR COND/APU BLEED [5HV] on panel 30VU.
     (b) Do the test given in Para. 3.
   (3) If the fault continues:
     (a) Do a check and repair if necessary the wiring between:
  • the BMC-1, BMC-2 Pin AB/6A and the ELECTRONIC CONTROL BOX (59KD) Pin AB/6D ASM 361201.
     (b) Do the test given in Para. 3.
   (4) If the fault continues:
     (a) Do a check and repair the wiring if necessary between:
  • the BMC-1, BMC-2 Pin AA/14C and the APU BLEED P/BSW (5HV) Pin A/B1 ASM 361201
  • the APU BLEED P/BSW (5HV) Pin A/B3 and GND ASM 361201.
     (b) Do the test given in Para. 3.
   (5) If the fault continues:
     (a) Do a check and repair the wiring if necessary between:
  • the BMC-1, BMC-2 Pin AA/15C and the ELECTRONIC CONTROL BOX (59KD) Pin AA/14D ASM 361201
  • the ELECTRONIC CONTROL BOX (59KD) Pin AB/6G and the APU LOAD-CONTROL VALVE connector P33 AWM 496102
  • the ELECTRONIC CONTROL BOX (59KD) Pin AB/7G and the APU LOAD-CONTROL VALVE connector P33 AWM 496102.
     (b) Do the test given in Para. 3.
   (6) If the fault continues:
     (a) Do the test given in Para. 3.
   (7) If the fault continues:
Subtask 36-12-00-810-051-C ** ON A/C NOT FOR ALL
B. Maintenance Action
   (1) If the APU LAST LEG/PREVIOUS LEG report shows some fault message or warning message:
     (a) Do the troubleshooting related to the fault shown.
   (2) If the fault continues:
  • Do a check and repair if necessary the wiring between:
    the BMC-1, BMC-2 connector AB/6A and the ECB (ELECTRONIC CONTROL BOX) (59KD) connector AB/D6 ASM 361201.
  • Do the test given in Para. 3.
   (3) If the fault continues:
  • Do a check and repair the wiring if necessary between:
    the BMC-1, BMC-2 connector AA/14C and the APU BLEED P/BSW (5HV) connector A/B1 ASM 361201,
    the APU BLEED P/BSW (5HV) connector A/B3 and GND ASM 361201.
  • Do the test given in Para. 3.
   (4) If the fault continues:
     (a) Do a check of the wiring between:
       1 Pin AA/15C of BMC-1 (and BMC-2) and connector P7 of the APU LOAD-CONTROL VALVE ASM 361201.
       2 Connector P7 of the APU LOAD-CONTROL VALVE and the GND ASM 361201.
         a If you find damage, repair or replace the wiring ESPM 205321.
     (b) Do the test given in Para. 3.
   (5) If the fault continues:
   (6) If the fault continues:
Subtask 36-12-00-710-051-A ** ON A/C NOT FOR ALL
C. Do the test as given in para. 3 to make sure that the operation is correct.
5. Close-up
Subtask 36-12-00-860-051-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to the serviceable condition.
   (1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
   (2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:33:59 UTC
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