W DOC AIRBUS | TSM A320F

Loss or Fluctuation of the Pressure of the Yellow Electric Pump

TASK 29-24-00-810-801-A
Loss or Fluctuation of the Pressure of the Yellow Electric Pump

1. Possible Causes
  • HYDR. PRESSURE TRANSMITTER [3065GN]
  • PACKAGE E-PUMP [3075GX]
  • HYD ACCU YELLOW [3070GM]
  • CHECK VALVE-ENG 2 PUMP DELIVERY, Y [3050GM]
  • SDAC-1 [1WV1]
  • SDAC-2 [1WV2]
  • SYSTEM-PRESS-SW [3151GN]
  • wiring
  • CURRENT UNBAL.DETECT. [3808GX]
  • CURRENT TRANSFORMER [3807GX]
  • RELAY-PHASE UNBAL DET & IND PWR SPLY (3812GX)
  • RELAY FAULT-IND PWR SPLY (3810GX)
  • RELAY-GEN PWR SPLY (3809GX)
  • 1156VD
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 29-13-36-000-001
Removal of the Engine 2 Yellow Hydraulic Pump Delivery Check Valve
AMM 29-13-36-400-001
Installation of the Engine 2 Yellow Hydraulic Pump Delivery Check Valve
AMM 29-13-42-000-001
Removal of the Yellow Power Accumulator
AMM 29-13-42-400-001
Installation of the Yellow Power Accumulator
AMM 29-24-00-710-001
Operational Test of the Yellow Auxiliary Power
ASM 292401
AMM 29-24-15-000-001
Removal of the Yellow Electric Pump Current Transformer
AMM 29-24-15-400-001
Installation of the Yellow Electric Pump Current Transformer
AMM 29-24-16-000-001
Removal of the Yellow Electric Pump Phase-Unbalance Detector
AMM 29-24-16-400-001
Installation of the Yellow Electric Pump Phase-Unbalance Detector
AMM 29-24-51-000-001
Removal of the Electric Pump
AMM 29-24-51-400-001
Installation of the Electric Pump
ASM 293201
AMM 29-32-11-000-003
Removal of the Hydraulic Pressure Transducer
AMM 29-32-11-400-003
Installation of the Hydraulic Pressure Transducer
AMM 29-32-12-000-003
Removal of the System Pressure Switch
AMM 29-32-12-400-003
Installation of the System Pressure Switch
ASM 315202
AMM 31-55-34-000-001
Removal of the SDAC
AMM 31-55-34-400-001
Installation of the SDAC
3. Fault Confirmation
Subtask 29-24-00-710-050-A
A. Test
   (1) Do the operational test of the Yellow electric pump AMM 29-24-00-710-001.
4. Fault Isolation
Subtask 29-24-00-810-055-A
A. If the test gives the message:
  • The HYD Y ELEC PUMP LO PR on the upper ECAM DU is shown
   (1) Replace the HYDR. PRESSURE TRANSMITTER [3065GN] , AMM 29-32-11-000-003 and AMM 29-32-11-400-003.
   (2) Do the test in Para. 3 A.
   (3) If the fault continues do the step that follows.
Subtask 29-24-00-810-050-A
B. If the test gives:
  • The HYD Y ELEC PUMP LO PR on the upper ECAM DU.
  • The triangle symbol of the Yellow E-pump on the HYD page of the lower ECAM DU in amber.
  • The YELLOW ELEC PUMP P/BSW FAULT on panel 40VU.
   (1) Make sure that the PACKAGE E-PUMP [3075GX] operates.
   (2) If the PACKAGE E-PUMP [3075GX] operates:
     (a) Look on the lower ECAM DU and do a check of the pressure indication.
     (b) If the pressure is less than 1450 psi (99.9740 bar):
       1 Do a check of the nitrogen charge pressure of the Yellow hydraulic power accumulator AMM 29-10-00-200-008:
         a If necessary, replace the HYD ACCU YELLOW [3070GM] AMM 29-13-42-000-001 and AMM 29-13-42-400-001.
       2 If the fault continues:
         a Replace the CHECK VALVE-ENG 2 PUMP DELIVERY, Y [3050GM] AMM 29-13-36-000-001 and AMM 29-13-36-400-001.
       3 If the fault continues:
         a Replace the PACKAGE E-PUMP [3075GX] AMM 29-24-51-000-001 and AMM 29-24-51-400-001.
       4 If the fault continues:
         a Replace the SDAC-1 [1WV1] and SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
     (c) If the pressure is more than 1450 psi (99.9740 bar):
       1 Replace the CHECK VALVE-ENG 2 PUMP DELIVERY, Y [3050GM] AMM 29-13-36-000-001 and AMM 29-13-36-400-001.
       2 Do a check for continuity between the SYSTEM-PRESS-SW [3151GN] connector A/A and the connector A/C ASM 293201:
       3 If there is continuity:
       4 If there is no continuity:
         a Do a check of the wiring for a GND connection between the SYSTEM-PRESS-SW [3151GN] connector A/C ASM 293201 and the FWC connector AD/06E ASM 315202.
         b If there is a GND connection:
  • Repair the wiring as neccesary.
   (3) If the PACKAGE E-PUMP [3075GX] does not operate:
     (a) Do a check of the red indicator light on the CURRENT UNBAL.DETECT. [3808GX] .
     (b) If the red indicator light is on:
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
       1 Put the YELLOW ELEC PUMP P/BSW (3804GX) on panel 40VU in the OFF position (OFF light is on and the red indicator light on the CURRENT UNBAL.DETECT. [3808GX] goes off).
       2 Put the YELLOW ELEC PUMP P/BSW (3804GX) in the ON position (ON light comes on).
       3 Look at the lower ECAM DU and examine if the PACKAGE E-PUMP [3075GX] operates.
       4 If the PACKAGE E-PUMP [3075GX] does not operate and the red indicator light on the CURRENT UNBAL.DETECT. [3808GX] comes on again:
       5 If the PACKAGE E-PUMP [3075GX] operates at normal pressure and the red indicator light on the CURRENT UNBAL.DETECT. [3808GX] does not come on:
  • No further actions are necessary.
     (c) If the red indicator light is not on:
       1 Do a check for 115 VAC between the PACKAGE E-PUMP [3075GX] connectors A/G and A/A, A/B, A/C ASM 292401.
       2 If there are 115 VAC:
       3 If there are no 115 VAC:
         a Do a check for 28 VDC between the CURRENT UNBAL.DETECT. [3808GX] connectors A/G and A/D ASM 292401.
         b If there are 28 VDC:
         c If the fault continues:
         d If the fault continues:
  • Do a check of the wiring between the PACKAGE E-PUMP [3075GX] connector A/A, A/B, A/C and the CB (3801GX) ASM 292401.
         e If the fault continues:
  • Replace the RELAY-PHASE UNBAL DET & IND PWR SPLY (3812GX).
         f If the fault continues:
  • Replace the RELAY FAULT-IND PWR SPLY (3810GX).
         g If the fault continues:
  • Replace the RELAY-GEN PWR SPLY (3809GX).
         h If the fault continues:
  • Do a check of the wiring between the PACKAGE E-PUMP [3075GX] connector A/A, A/B, A/C and the CB (3802GX) ASM 292401.
         i If the fault continues:
  • Do a check of the diodes 10/25 and 11/26 on 1156VD .
         j If there are no 28 VDC:
  • Do a check of the wiring between the CURRENT UNBAL.DETECT. [3808GX] connector A/F and the CB (3803GX) and repair as necessary ASM 292401.
Subtask 29-24-00-710-051-A
C. Test
   (1) Do the test as given in Para. 3. A. to make sure that the operation is correct.
[Rev.8 from Aug 2018] 2026.04.04 04:29:30 UTC
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