W DOC AIRBUS | TSM A320F

Fault of the Crossbleed Valve Position Control

TASK 36-12-00-810-802-A
Fault of the Crossbleed Valve Position Control

1. Possible Causes
  • CROSSBLEED VALVE [6HV]
  • BMC-1 [1HA1]
  • BMC-2 [1HA2]
  • wiring
  • X-BLEED-VALVE AUTO CTL RELAY (4HV)
  • CROSSBLEED-VALVE SELECTOR SWITCH (3HV)
  • X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 36-11-00-710-001
Operational Test to read the CURRENT STATUS of the Engine Bleed Air System
AMM 36-11-34-000-001
Removal of the BMC
AMM 36-11-34-400-001
Installation of the BMC
ASM 361201
AMM 36-12-52-000-001
Removal of the Crossbleed Valve
AMM 36-12-52-400-001
Installation of the Crossbleed Valve
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))
3. Fault Confirmation
Subtask 36-12-00-710-052-B ** ON A/C NOT FOR ALL
A. Test
   (1) Start the APU AMM 49-00-00-860-005.
   (2) On the AIR COND panel 30VU:
     (a) Make sure that:
  • The ENG 1(2) bleed P/BSW's are pushed and the OFF legends are off
  • The X BLEED selector switch is in the AUTO position
  • The APU BLEED P/BSW is pushed and the ON legend is on.
   (3) Do the operational test to read the CURRENT STATUS of the BMC's AMM 36-11-00-710-001.
   (4) Stop the APU AMM 49-00-00-860-006.
Subtask 36-12-00-710-052-C ** ON A/C NOT FOR ALL
A. Test
   (1) Start the APU AMM 49-00-00-860-008.
   (2) On the AIR COND panel 30VU:
     (a) Make sure that:
  • The ENG 1(2) bleed P/BSW's are pushed and the OFF legends are off
  • The X BLEED selector switch is in the AUTO position
  • The APU BLEED P/BSW is pushed and the ON legend is on.
   (3) Do the operational test to read the CURRENT STATUS of the BMC's AMM 36-11-00-710-001.
   (4) Stop the APU AMM 49-00-00-860-009.
4. Fault Isolation
Subtask 36-12-00-810-052-A ** ON A/C NOT FOR ALL
A. In the test in Para. 3. A. if BMC1 and BMC2 show that the CROSSBLEED VALVE [6HV] is accidentally open:
  • Put the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) to the CLOSE position.
   (1) If the CROSSBLEED VALVE [6HV] closes:
     (a) Remove one of the two BMC's AMM 36-11-34-000-001.
     (b) Do the operational test to read the CURRENT STATUS of the BMC's again AMM 36-11-00-710-001.
     (c) If the test is OK:
       1 Replace the removed BMC-1 [1HA1] or BMC-2 [1HA2] AMM 36-11-34-400-001.
     (d) If the test is not OK:
       1 Install the removed BMC-1 [1HA1] or BMC-2 [1HA2] AMM 36-11-34-400-001.
       2 Remove the other BMC AMM 36-11-34-000-001.
       3 Do the operational test to read the CURRENT STATUS of the BMC's again AMM 36-11-00-710-001.
     (e) If the test is OK:
       1 Replace the removed BMC-1 [1HA1] or BMC-2 [1HA2] AMM 36-11-34-400-001.
   (2) If the fault continues:
     (a) Do a check for a ground signal at the X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV) connector A/X2 ASM 361201.
     (b) If there is a ground signal:
       1 Do a check and repair the wiring between:
the BMC-1, BMC-2 (1HA1, 1HA2) connector AB/5A and the X-BLEED-VALVE AUTO CTL RELAY (4HV) connector A/X2 ASM 361201.
     (c) If there is no ground signal:
       1 Replace the X-BLEED-VALVE AUTO CTL RELAY (4HV).
   (3) If the CROSSBLEED VALVE [6HV] does not close:
     (a) Replace the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) on the panel 30VU.
   (4) If the fault continues:
     (a) Replace the CROSSBLEED VALVE [6HV] AMM 36-12-52-000-001 and AMM 36-12-52-400-001.
Subtask 36-12-00-810-053-A ** ON A/C NOT FOR ALL
B. In the test in Para. 3. A. if BMC1 and BMC2 show that the CROSSBLEED VALVE [6HV] is accidentally closed:
   (1) If the fault continues:
  • put the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) on panel 30VU to the OPEN position.
     (a) If the CROSSBLEED VALVE [6HV] opens:
  • replace the X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV).
       1 If the fault continues:
  • replace the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) on the panel 30VU.
       2 If the fault continues:
  • do a check and repair the wiring between:
    the X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV) connector A/A3,A1 and the CROSSBLEED VALVE [6HV] connector A/H,J ASM 361201,
  • do a check and repair the wiring between:
    the CROSSBLEED VALVE [6HV] connector A/G and ground ASM 361201.
       3 If the fault continues:
  • do a check and repair the wiring between:
    the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) connector A/23 and the X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV) connector A/A2,X1 ASM 361201.
       4 If the fault continues:
  • do a check and repair the wiring between:
    the CIRCUIT BREAKER (1HV) and the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) connector A/21 ASM 361201.
       5 If the fault continues:
  • do a check and repair the wiring between:
    the X-BLEED-VALVE AUTOMATIC-CONTROL RELAY (4HV) connector A/X2 and the BMC-1, BMC-2 (1HA1/2) connector AB/5A ASM 361201.
     (b) If the CROSSBLEED VALVE [6HV] does not open:
  • replace the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) on the panel 30VU.
       1 If the fault continues:
  • do a check and repair the wiring between:
    the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) connector A/10,12 and the CROSSBLEED VALVE [6HV] connector A/K,L ASM 361201,
  • do a check and repair the wiring between:
    the CROSSBLEED VALVE [6HV] A/M and ground ASM 361201.
       2 If the fault continues:
  • do a check and repair the wiring between:
    the CIRCUIT BREAKER (2HV) and the CROSSBLEED-VALVE SELECTOR SWITCH (3HV) connector A/9 ASM 361201.
Subtask 36-12-00-810-054-A ** ON A/C NOT FOR ALL
C. In the test in Para. 3. A. if only one BMC shows an incorrect X-FEED VALVE position:
   (1) If the fault continues:
  • do a check and repair the wiring between:
    the related BMC connector AB/5A and the first terminal block ASM 361201.
Subtask 36-12-00-710-053-A ** ON A/C NOT FOR ALL
D. Do the test as given in Para. 3. to make sure that the operation is correct.
[Rev.8 from Aug 2018] 2026.04.04 04:33:59 UTC
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