W DOC AIRBUS | TSM A320F

Hydraulic System Pressure higher than normal

TASK 29-13-00-810-817-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 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 29-10-00-863-002
Pressurize the Yellow Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-002
Depressurize the Yellow Hydraulic System
AMM 29-13-43-610-040
Servicing of the Engine Pump Case-Drain Filter
AMM 29-13-43-610-041
Servicing of the Engine Pump Case-Drain Filter
AMM 29-13-43-610-802
Servicing of the Engine-Pump Case-Drain Filter
AMM 29-13-45-610-001
Servicing of the HP-Filter
AMM 29-13-51-000-003
Removal of the Yellow Engine Pump
AMM 29-13-51-000-004
Removal of the Yellow Engine Pump
AMM 29-13-51-000-806
Removal of the Yellow Engine Driven Pump
AMM 29-13-51-100-801
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-13-51-100-802
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-13-51-100-804
Cleaning of the Engine Pump Solenoid-Valve
AMM 29-13-51-400-003
Installation of the Yellow Engine Pump
AMM 29-13-51-400-004
Installation of the Yellow Engine Pump
AMM 29-13-51-400-806
Installation of the Yellow Engine Driven Pump
AMM 29-14-00-614-002
Pressurization of the Hydraulic Reservoirs through the Ground Connector
AMM 29-24-00-863-001
Pressurize the Yellow Hydraulic System with the Electric Pump
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 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 29-13-00-865-059-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/SOL VALVES/G/Y/B/LEAK/TST1881GPN35
121VUHYDRAULIC/SOL VALVES/G/Y/PTU1801GLN34
121VUHYDRAULIC/Y HYD/PUMP ENG2/MONG3700GDQ37
121VUHYDRAULIC/Y HYD/PUMP ENG2/CTL3701GDQ36
Subtask 29-13-00-860-069-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 switch P/BSW. Make sure that the HYD page is shown on the lower Display Unit (DU) of the ECAM.
   (4) Make sure that the ECAM does not show any of these conditions;
  • low air pressure in the Yellow reservoir,
  • low fluid level in the Yellow 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.
   (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 YELLOW/ENG 2 PUMP P/BSW is set to on. (FAULT and OFF lights are out).
Subtask 29-13-00-710-069-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 right (No. 2) engine AMM 71-00-00-710-001.
   (2) Look for the Yellow hydraulic system pressure indication on the lower ECAM DU.
Subtask 29-13-00-710-069-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 right (No. 2) engine AMM 71-00-00-710-001.
   (2) Look for the Yellow hydraulic system pressure indication on the lower ECAM DU.
Subtask 29-13-00-710-069-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 right (No. 2) engine AMM 71-00-00-720-809.
   (2) Look for the Yellow hydraulic system pressure indication on the lower ECAM DU.
4. Fault Isolation
Subtask 29-13-00-810-071-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 right (No.2) engine AMM 71-00-00-710-001.
   (2) Pressurize the Yellow hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-002.
     (a) As an alternative you can also pressurize the Yellow hydraulic system with the Yellow electric pump as given in the AMM Task AMM 29-24-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Yellow hydraulic system AMM 29-10-00-864-002.
     (a) If the system pressure is in the normal range:
       1 Replace the PUMP VARIABLE DTS [3084GM] AMM 29-13-43-610-040.
       2 If the fault continues:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-100-801.
         b Do the test given in Para. 3.
       3 If the fault continues:
         a Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-003 and AMM 29-13-51-400-003.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER Y [3048GM] AMM 29-13-45-610-001.
       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 29-13-00-810-071-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 right (No.2) engine AMM 71-00-00-710-001.
   (2) Pressurize the Yellow hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-002.
     (a) As an alternative you can also pressurize the Yellow hydraulic system with the Yellow electric pump as given in the AMM Task AMM 29-24-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Yellow hydraulic system AMM 29-10-00-864-002.
     (a) If the system pressure is in the normal range:
       1 Replace the PUMP VARIABLE DTS [3084GM] AMM 29-13-43-610-041.
       2 If the fault continues:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-100-802.
         b Do the test given in Para. 3.
       3 If the fault continues:
         a Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-004 and AMM 29-13-51-400-004.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER Y [3048GM] AMM 29-13-45-610-001.
       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 29-13-00-810-071-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 right (No.2) engine AMM 71-00-00-720-809.
   (2) Pressurize the Yellow hydraulic system with a GROUND POWER CART-HYDRAULIC AMM 29-10-00-863-002.
     (a) As an alternative you can also pressurize the Yellow hydraulic system with the Yellow electric pump as given in the AMM Task AMM 29-24-00-863-001.
   (3) Look for the hydraulic system pressure indication on the lower ECAM DU.
   (4) Depressurize the Yellow hydraulic system AMM 29-10-00-864-002.
     (a) If the system pressure is in the normal range:
       1 Replace the PUMP VARIABLE DTS [3084GM] AMM 29-13-43-610-802.
       2 If the fault continues:
         a Clean the Solenoid Valve of the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-100-804.
         b Do the test given in Para. 3.
       3 If the fault continues:
         a Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-806 and AMM 29-13-51-400-806.
     (b) If the hydraulic system pressure is to high:
       1 If the fault continues:
         a Replace the HP FILTER Y [3048GM] AMM 29-13-45-610-001.
       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 29-13-00-710-070-A
B. Do the fault confirmation procedure as given in Para. 3. to make sure that the operation is correct.
5. Close-up
Subtask 29-13-00-860-070-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 04:29:27 UTC
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