W DOC AIRBUS | TSM A320F

Loss of the Pressure of the ENG 1 Pump

TASK 29-11-00-810-804-A
Loss of the Pressure of the ENG 1 Pump

1. Possible Causes
  • PUMP VARIABLE DTS [1030GK]
  • ENG 1 PUMP P/BSW (1705GK)
  • wiring
  • ENG-HYD.-PUMP-SW [1074GK]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 29-00-00-280-006
Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - with Ground Cart Available
AMM 29-11-00-710-001
Operational Test of the Green Hydraulic System
ASM 291101
AMM 29-11-17-000-040
Removal of the Engine-Pump Pressure Switch
AMM 29-11-17-000-041
Removal of the Engine-Pump Pressure Switch
AMM 29-11-17-000-802
Removal of the Engine-Pump Pressure Switch
AMM 29-11-17-400-040
Installation of the Engine-Pump Pressure Switch
AMM 29-11-17-400-041
Installation of the Engine-Pump Pressure Switch
AMM 29-11-17-400-802
Installation of the Engine-Pump Pressure Switch
AMM 29-11-51-000-040
Removal of the Green Engine Pump
AMM 29-11-51-000-041
Removal of the Green Engine Pump
AMM 29-11-51-000-805
Removal of the Green Engine Driven Pump
AMM 29-11-51-100-801
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-11-51-100-802
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-11-51-100-804
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-11-51-400-040
Installation of the Green Engine Pump
AMM 29-11-51-400-041
Installation of the Green Engine Pump
AMM 29-11-51-400-805
Installation of the Green Engine Driven Pump
3. Fault Confirmation
Subtask 29-11-00-710-052-A
A. Do the operational test of the Green hydraulic system AMM 29-11-00-710-001.
4. Fault Isolation
Subtask 29-11-00-810-055-A ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD G ENG 1 PUMP LO PR on the upper ECAM DU
  • The LO flag of the Green hydraulic system on the HYD page of the lower ECAM DU
  • The PTU running indication on the HYD page of the lower ECAM DU
NOTE: The PRESS SW-G PUMP, ENG 1 (1074GK) sends a low pressure signal to the ECAM system. This causes the PTU running indication on the lower ECAM DU, although the PTU does not operate (non system failure).
  • The Green ENG 1 PUMP P/BSW FAULT light on panel 40VU

  • Look on the HYD page of the lower ECAM DU and do a check of the pressure of the Green system.
   (1) If the pressure is less than 1667 psi (114.9356 bar):
  • Do a check on the lower ECAM DU to make sure that the engine pump fire valve 1046GK is not closed.
     (a) If the engine pump fire valve is closed:
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
  • Push the ENG 1 FIRE P/BSW on panel 1WD (ENG/APU FIRE section on the overhead panel 20VU) to open the engine pump fire valve 1046GK.
     (b) If the engine pump fire valve is not closed:
  • Do a check for 28 VDC between:
    PUMP VARIABLE DTS [1030GK] connector A/1 and PUMP VARIABLE DTS [1030GK] connector A/3 ASM 291101.
       1 If there is no 28 VDC:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-100-801.
         b Do the test given in Para. 3.
         c If the fault continues:
         d Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-040 and AMM 29-11-51-400-040.
         e Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
       2 If there is 28 VDC:
  • Replace the ENG 1 PUMP P/BSW (1705GK).
       3 If the fault continues:
  • Do a check of the wiring between:
    the PUMP VARIABLE DTS [1030GK] connector A/3 and the CB (1701GK) and repair the wiring as necessary ASM 291101.
   (2) If the pressure is more than 1812 psi (124.9330 bar):
  • Do a check for continuity between:
PRESS SW-G PUMP, ENG 1 (1074GK) connector A/1 and A/2 ASM 291101.
     (a) If there is continuity:
     (b) If there is no continuity:
  • Make sure that the wiring is not connected to GND between:
ENG-HYD.-PUMP-SW [1074GK] connector A/1 and the DIODE (1158VD) connector 14 ASM 291101.
       1 If the wiring is connected to GND:
  • Repair the wiring as necessary.
Subtask 29-11-00-810-055-C ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD G ENG 1 PUMP LO PR on the upper ECAM DU
  • The LO flag of the Green hydraulic system on the HYD page of the lower ECAM DU
  • The PTU running indication on the HYD page of the lower ECAM DU
NOTE: The PRESS SW-G PUMP, ENG 1 (1074GK) sends a low pressure signal to the ECAM system. This causes the PTU running indication on the lower ECAM DU, although the PTU does not operate (non system failure).
  • The Green ENG 1 PUMP P/BSW FAULT light on panel 40VU

  • Look on the HYD page of the lower ECAM DU and do a check of the pressure of the Green system.
   (1) If the pressure is less than 1667 psi (114.9356 bar):
  • Do a check on the lower ECAM DU to make sure that the engine pump fire valve 1046GK is not closed.
     (a) If the engine pump fire valve is closed:
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
  • Push the ENG 1 FIRE P/BSW on panel 1WD (ENG/APU FIRE section on the overhead panel 20VU) to open the engine pump fire valve 1046GK.
     (b) If the engine pump fire valve is not closed:
  • Do a check for 28 VDC between:
    PUMP VARIABLE DTS [1030GK] connector A/1 and PUMP VARIABLE DTS [1030GK] connector A/3 ASM 291101.
       1 If there is no 28 VDC:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-100-802.
         b Do the test given in Para. 3.
         c If the fault continues:
         d Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-041 and AMM 29-11-51-400-041.
         e Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
       2 If there is 28 VDC:
  • Replace the ENG 1 PUMP P/BSW (1705GK).
       3 If the fault continues:
  • Do a check of the wiring between:
    the PUMP VARIABLE DTS [1030GK] connector A/3 and the CB (1701GK) and repair the wiring as necessary ASM 291101.
   (2) If the pressure is more than 1812 psi (124.9330 bar):
  • Do a check for continuity between:
PRESS SW-G PUMP, ENG 1 (1074GK) connector A/1 and A/2 ASM 291101.
     (a) If there is continuity:
     (b) If there is no continuity:
  • Make sure that the wiring is not connected to GND between:
    ENG-HYD.-PUMP-SW [1074GK] connector A/1 and the DIODE (1158VD) connector 14 ASM 291101.
       1 If the wiring is connected to GND:
  • Repair the wiring as necessary.
Subtask 29-11-00-810-055-D ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD G ENG 1 PUMP LO PR on the upper ECAM DU
  • The LO flag of the Green hydraulic system on the HYD page of the lower ECAM DU
  • The PTU running indication on the HYD page of the lower ECAM DU
NOTE: The PRESS SW-G PUMP, ENG 1 (1074GK) sends a low pressure signal to the ECAM system. This causes the PTU running indication on the lower ECAM DU, although the PTU does not operate (non system failure).
  • The Green ENG 1 PUMP P/BSW FAULT light on panel 40VU

  • Look on the HYD page of the lower ECAM DU and do a check of the pressure of the Green system.
   (1) If the pressure is less than 1667 psi (114.9356 bar):
  • Do a check on the lower ECAM DU to make sure that the engine pump fire valve 1046GK is not closed.
     (a) If the engine pump fire valve is closed:
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
  • Push the ENG 1 FIRE P/BSW on panel 1WD (ENG/APU FIRE section on the overhead panel 20VU) to open the engine pump fire valve 1046GK.
     (b) If the engine pump fire valve is not closed:
  • Do a check for 28 VDC between:
    PUMP VARIABLE DTS [1030GK] connector A/1 and PUMP VARIABLE DTS [1030GK] connector A/3 ASM 291101.
       1 If there is no 28 VDC:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-100-804.
         b Do the test given in Para. 3.
         c If the fault continues:
         d Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-805 and AMM 29-11-51-400-805.
         e Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
       2 If there is 28 VDC:
  • Replace the ENG 1 PUMP P/BSW (1705GK).
       3 If the fault continues:
  • Do a check of the wiring between:
    the PUMP VARIABLE DTS [1030GK] connector A/3 and the CB (1701GK) and repair the wiring as necessary ASM 291101.
   (2) If the pressure is more than 1812 psi (124.9330 bar):
  • Do a check for continuity between:
PRESS SW-G PUMP, ENG 1 (1074GK) connector A/1 and A/2 ASM 291101.
     (a) If there is continuity:
     (b) If there is no continuity:
  • Make sure that the wiring is not connected to GND between:
ENG-HYD.-PUMP-SW [1074GK] connector A/1 and the DIODE (1158VD) connector 14 ASM 291101.
       1 If the wiring is connected to GND:
  • Repair the wiring as necessary.
Subtask 29-11-00-710-057-A
B. Do the test as given in Para. 3. A. to make sure that operation is correct.
[Rev.8 from Aug 2018] 2026.04.04 04:29:20 UTC
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