W DOC AIRBUS | TSM A320F

Hydraulic System Pressure higher than normal

TASK 29-11-00-810-814-A
Hydraulic System Pressure higher than normal

1. Possible Causes
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
GROUND POWER CART-HYDRAULIC
 B. Referenced Information
REFERENCE
DESIGNATION
AMM 12-12-29-611-001
Fill the Hydraulic Fluid Reservoir with a Hand Pump
AMM 12-12-29-611-002
Fill the Hydraulic Fluid Reservoir with a Hydraulic Service Cart
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 29-10-00-863-001
Pressurize the Green Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-001
Depressurize the Green Hydraulic System
AMM 29-11-43-610-040
Servicing of the Engine-Pump Case-Drain Filter
AMM 29-11-43-610-041
Servicing the Engine-Pump Case-Drain Filter
AMM 29-11-43-610-802
Servicing of the Engine-Pump Case-Drain Filter
AMM 29-11-45-610-001
Servicing of the HP-Filter
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
AMM 29-14-00-614-002
Pressurization of the Hydraulic Reservoirs through the Ground Connector
AMM 29-32-11-000-001
Removal of the Hydraulic Pressure Transducer
AMM 29-32-11-400-001
Installation of the Hydraulic Pressure Transducer
AMM 31-55-34-000-001
Removal of the SDAC
AMM 31-55-34-400-001
Installation of the SDAC
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
AMM 71-00-00-710-001
Dry Motoring Check
AMM 71-00-00-720-809
Test No. 2 - Engine Motor Leak Test (Dry Method)
3. Fault Confirmation
Subtask 29-11-00-865-059-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKH12
** ON A/C NOT FOR ALL
121VUHYDRAULIC/G HYD/PUMP ENG1/CTL1701GKR35
** ON A/C ALL
121VUHYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST1881GPN35
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
Subtask 29-11-00-860-067-A
B. Aircraft Maintenance Configuration
   (1) Energize the aircraft electrical circuits AMM 24-41-00-861-002.
   (2) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
   (3) On the ECAM control panel on the center pedestal, press the HYD pushbutton. Make sure that the HYD page is shown on the ECAM lower Display Unit (DU).
   (4) Make sure that the ECAM does not show any of these conditions:
  • low air pressure in the Green reservoir,
  • low fluid level in the Green reservoir.
   (5) If necessary, pressurize the reservoir AMM 29-14-00-614-002.
   (6) If necessary, add fluid to the reservoir AMM 12-12-29-611-001 or AMM 12-12-29-611-002.
   (7) On the overhead panel 40VU, press the PTU/AUTO P/BSW (the OFF light comes on).
   (8) Make sure that the PTU does not operate.
   (9) On the overhead panel 40VU, make sure that the GREEN/ENG 1 PUMP P/BSW is set to on (FAULT and OFF lights are off).
Subtask 29-11-00-710-065-A ** ON A/C NOT FOR ALL
C. Test
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
   (1) Dry-motor the left (No. 1) engine AMM 71-00-00-710-001.
   (2) Look for the Green hydraulic system pressure indication on the lower ECAM DU.
Subtask 29-11-00-710-065-B ** ON A/C NOT FOR ALL
C. Test
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
   (1) Dry-motor the left (No. 1) engine AMM 71-00-00-710-001.
   (2) Look for the Green hydraulic system pressure indication on the lower ECAM DU.
Subtask 29-11-00-710-065-D ** ON A/C NOT FOR ALL
C. Test
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROL SURFACES ARE CLEAR BEFORE YOU PRESSURIZE/DEPRESSURIZE A HYDRAULIC SYSTEM.
WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE.
   (1) Dry-motor the left (No. 1) engine AMM 71-00-00-720-809.
   (2) Look for the Green hydraulic system pressure indication on the lower ECAM DU.
4. Fault Isolation
Subtask 29-11-00-810-068-A ** ON A/C NOT FOR ALL
A. If the fault confirmation gives:
  • The hydraulic system pressure indication on the lower ECAM DU shows a higher value than normal:
   (1) Stop the dry motoring of the left (No.1) engine AMM 71-00-00-710-001.
   (2) Pressurize the Green hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Green hydraulic system AMM 29-10-00-864-001.
     (a) If the system pressure is in the normal range:
       1 If the fault continues:
         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.
       2 If the fault continues:
         a Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-040 and AMM 29-11-51-400-040.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER G [1048GM] AMM 29-11-45-610-001.
       2 If the fault continues:
         a Replace the SDAC-1 [1WV1] or SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
Subtask 29-11-00-810-068-B ** ON A/C NOT FOR ALL
A. If the fault confirmation gives:
  • The hydraulic system pressure indication on the lower ECAM DU shows a higher value than normal:
   (1) Stop the dry motoring of the left (No.1) engine AMM 71-00-00-710-001.
   (2) Pressurize the Green hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Green hydraulic system AMM 29-10-00-864-001.
     (a) If the system pressure is in the normal range:
       1 If the fault continues:
         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.
       2 If the fault continues:
         a Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-041 and AMM 29-11-51-400-041.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER G [1048GM] AMM 29-11-45-610-001.
       2 If the fault continues:
         a Replace the SDAC-1 [1WV1] or SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
Subtask 29-11-00-810-068-D ** ON A/C NOT FOR ALL
A. If the fault confirmation gives:
  • The hydraulic system pressure indication on the lower ECAM DU shows a higher value than normal:
   (1) Stop the dry motoring of the left (No.1) engine AMM 71-00-00-720-809.
   (2) Pressurize the Green hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Green hydraulic system AMM 29-10-00-864-001.
     (a) If the system pressure is in the normal range:
       1 If the fault continues:
         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.
       2 If the fault continues:
         a Replace the PUMP VARIABLE DTS [1030GK] AMM 29-11-51-000-805 and AMM 29-11-51-400-805.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER G [1048GM] AMM 29-11-45-610-001.
       2 If the fault continues:
         a Replace the SDAC-1 [1WV1] or SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
Subtask 29-11-00-710-066-A
B. Do the fault confirmation procedure as given in Para. 3. to make sure that the operation is correct.
5. Close-up
Subtask 29-11-00-860-068-A
A. Put the aircraft back to the serviceable condition.
   (1) Do the EIS stop procedure
AMM 31-60-00-860-002.
   (2) De-energize the aircraft electrical circuits AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:29:21 UTC
"WTRUIB" 2025