W DOC AIRBUS | TSM A320F

Loss of the Pressure of the Blue Electric Pump

TASK 29-12-00-810-804-A
Loss of the Pressure of the Blue Electric Pump

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 29-10-00-200-008
Check Nitrogen Charge Pressure on Hydraulic Power Accumulators
AMM 29-12-00-710-001
Functional Check of Blue Electrical Pump Pressure by Reading ECAM Indication
ASM 291201
AMM 29-12-15-000-001
Removal of the Blue Electric-Pump Current Transformer
AMM 29-12-15-400-001
Installation of the Blue Electric-Pump Current Transformer
AMM 29-12-17-000-001
Removal of the Electric Pump Pressure-Switch
AMM 29-12-17-400-001
Installation of the Electric Pump Pressure-Switch
AMM 29-12-18-000-001
Removal of the Blue Electric Pump Phase-Unbalance Detector
AMM 29-12-18-400-001
Installation of the Blue Electric Pump Phase-Unbalance Detector
AMM 29-12-42-000-001
Removal of the Blue Power Accumulator
AMM 29-12-42-400-001
Installation of the Blue Power Accumulator
AMM 29-12-51-000-001
Removal of the Electric Pump
AMM 29-12-51-400-001
Installation of the Electric Pump
AMM 29-12-55-000-001
Removal of the Blue Electric-Pump Supply Contactor
AMM 29-12-55-400-001
Installation of the Blue Electric-Pump Supply Contactor
AMM 29-24-51-000-001
Removal of the Electric Pump
AMM 29-24-51-400-001
Installation of the Electric Pump
AMM 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
3. Fault Confirmation
NOTE: Continue with the step B. when the crew reported that the HYD B ELEC PUMP LO PRESS warning was shown for a short time during the start of the engines.
Subtask 29-12-00-710-052-A
A. Do the operational test of the Blue hydraulic system AMM 29-12-00-710-001.
Subtask 29-12-00-710-070-A ** ON A/C NOT FOR ALL
B. Do the subsequent test when the HYD B ELEC PUMP LO PRESS warning was shown for a short time during the start of the engines.
   (1) Start the engine No. 2 AMM 71-00-00-710-003.
   (2) Start the engine No. 1 AMM 71-00-00-710-003.
   (3) Look at the upper ECAM DU for the warning HYD B ELEC PUMP LO PRESS.
   (4) Shutdown the engines AMM 71-00-00-710-028.
Subtask 29-12-00-710-070-B ** ON A/C NOT FOR ALL
B. Do the subsequent test when the HYD B ELEC PUMP LO PRESS warning was shown for a short time during the start of the engines.
   (1) Start the engine No. 2 AMM 71-00-00-710-003.
   (2) Start the engine No. 1 AMM 71-00-00-710-003.
   (3) Look at the upper ECAM DU for the warning HYD B ELEC PUMP LO PRESS.
   (4) Shutdown the engines AMM 71-00-00-710-028.
4. Fault Isolation
Subtask 29-12-00-810-052-A
A. If the test gives:
  • HYD B ELEC PUMP LO PR on the upper ECAM DU,
  • LO flag of the BLUE hydraulic system on the HYD page of the lower ECAM DU,
  • BLUE ELEC PUMP P/BSW FAULT on panel 40VU,
    do the steps that follows:
  • examine if the Blue electric pump operates.
   (1) If the PACKAGE E-PUMP [2075GJ] operates:
  • look on the ECAM SD - DU and do a check of the pressure indication.
     (a) If the pressure is less than 1450 psi (99.9740 bar):
       1 Do a check of the nitrogen charge pressure of the Blue hydraulic power accumulator AMM 29-10-00-200-008.
         a If necessary, replace the HYD ACCU BLUE [2070GM] AMM 29-12-42-000-001 and AMM 29-12-42-400-001.
       2 If the fault continues:
         a Replace the PACKAGE E-PUMP [2075GJ] AMM 29-12-51-000-001 and AMM 29-12-51-400-001.
NOTE: You can replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y (3075GX) which is interchangeable, if a new pump is not available AMM 29-24-51-000-001 and AMM 29-24-51-400-001.
     (b) If the pressure is more than 1450 psi (99.9740 bar):
  • do a check for continuity between:
    PRESS SW-ELEC PUMP, B [2074GJ] connector A/A and connector A/C
  • repair the wiring as necessary ASM 291201.
       1 If there is continuity:
       2 If there is no continuity:
  • do a check of the wiring for a GND connection between:
    PRESS SW-ELEC PUMP, B [2074GJ] connector A/C and the SDAC connector AA/04F ASM 291201.
         a If there is a GND connection:
  • repair the wiring as necessary.
   (2) If the PACKAGE E-PUMP [2075GJ] does not operate:
  • do a check of the red indicator light on the CURRENT UNBAL.DETECT. [2707GJ] .
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
     (a) If the red indicator light is on:
  • put the BLUE ELEC PUMP P/BSW (2704GJ) on panel 40VU in the OFF position ( OFF light is on and the red indicator light on the CURRENT UNBAL.DETECT. [2707GJ] goes off),
  • put the BLUE ELEC PUMP P/BSW (2704GJ) in the AUTO position (OFF light goes off),
  • put the BLUE PUMP OVRD P/BSW (2703GJ) on panel 50VU in the ON position
  • look on the SD - DU and examine if the PACKAGE E-PUMP [2075GJ] operates.
       1 If the PACKAGE E-PUMP [2075GJ] operates at normal pressure and the red indicator light on the CURRENT UNBAL.DETECT. [2707GJ] does not come on:
  • no more actions are necessary.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
       2 If the PACKAGE E-PUMP [2075GJ] does not operate and the red indicator light CURRENT UNBAL.DETECT. [2707GJ] comes on again:
  • interchange the CURRENT UNBAL.DETECT. [2707GJ] and CURRENT UNBAL.DETECT. [3808GX] AMM 29-12-18-000-001 and AMM 29-12-18-400-001
  • interchange the CURRENT TRANSFORMER [2706GJ] and CURRENT TRANSFORMER [3807GX] AMM 29-12-15-000-001 and AMM 29-12-15-400-001
  • put the BLUE ELEC PUMP P/BSW (2704GJ) on panel 40VU in the OFF position ( OFF light is on and the red indicator light on the CURRENT UNBAL.DETECT. [2707GJ] goes off)
  • put the BLUE ELEC PUMP P/BSW (2704GJ) in the AUTO position (OFF light goes off)
  • put the BLUE PUMP OVRD P/BSW (2703GJ) on panel 50VU in the ON position
  • look on the SD - DU and examine if the PACKAGE E-PUMP [2075GJ] operates.
       3 If the PACKAGE E-PUMP [2075GJ] does not operate and the red indicator light CURRENT UNBAL.DETECT. [2707GJ] comes on again:
NOTE: You can replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y (3075GX) which is interchangeable, if a new pump is not available AMM 29-24-51-000-001 and AMM 29-24-51-400-001.
       4 If the PACKAGE E-PUMP [2075GJ] operates at normal pressure and the red indicator light on the CURRENT UNBAL.DETECT. [2707GJ] does not come on:
     (b) If the red indicator light is not on:
  • do a check for 115VAC between:
    the PACKAGE E-PUMP [2075GJ] connectors A/G and A/A, A/B, A/C.
       1 If there are 115VAC:
NOTE: You can replace the ELEC PUMP-B (2075GJ) with the ELEC PUMP-Y (3075GX) which is interchangeable, if a new pump is not available AMM 29-24-51-000-001 and AMM 29-24-51-400-001.
       2 If there are no 115VAC:
  • do a check for 115VAC between the ground and each pin of the C/B-B HYD/ELEC PUMP [2701GJ] .
         a If there is no 115VAC between the ground and pins A1, A2, B1, B2, C1 and C2:
  • replace the C/B-B HYD/ELEC PUMP [2701GJ] .
         b If there is 115VAC between the ground and pins A1, A2, B1, B2, C1 and C2:
  • do a check for 28VDC between the CURRENT UNBAL.DETECT. [2707GJ] connectors A/G and A/F.
         c If there are 28VDC:
         d If the fault continues:
         e If the fault continues:
         f If the fault continues:
  • do a check of the wiring between: CURRENT UNBAL.DETECT. [2707GJ] connector A/D and CONTACTOR [2705GJ] B/3
  • repair as necessary.
         g If the fault continues:
  • do a check of the wiring between:
    PACKAGE E-PUMP [2075GJ] connectors A/A, A/B and A/C and CB (2701GJ)
  • repair as necessary.
         h If there are no 28VDC:
  • do a check of the wiring between: CURRENT UNBAL.DETECT. [2707GJ] connector A/F and CB (2702GJ)
  • repair as necessary.
Subtask 29-12-00-810-073-A
B. If the HYD B ELEC PUMP LO PRESS warning was shown for a short time during the fault confirmation with engines running:
  • Replace the RELAY-N2 SPEED CONDTN [2709GJ] .
Subtask 29-12-00-710-055-A
C. Do the test as given in Para. 3. A. or 3. B. to make sure that operation is correct.
[Rev.8 from Aug 2018] 2026.04.04 04:29:22 UTC
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