W DOC AIRBUS | TSM A320F

Indication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High or Low Level or fluctuates

TASK 29-13-00-810-815-A
Indication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High or Low Level or fluctuates

1. Possible Causes
  • gas leaks
  • HYD ACCU YELLOW [3070GM]
  • ACCU-BRK YELLOW PRESS [2582GM]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
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 29-00-00-870-004
Bleeding Procedure of the Yellow Hydraulic System Upstream of the Engine Pump
AMM 29-00-00-870-005
Bleeding Procedure of the Yellow Hydraulic System Upstream of the PTU
AMM 29-00-00-870-006
Bleeding Procedure of the Yellow Hydraulic System Upstream of the Yellow E-Pump
AMM 29-00-00-870-007
Bleeding Procedure of the Yellow Hydraulic System Downstream of the Engine Pump
AMM 29-10-00-200-002
Check Reservoir Air Pressure on Reservoir Gauge
AMM 29-10-00-200-008
Check Nitrogen Charge Pressure on Hydraulic Power Accumulators
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 29-24-00-863-001
Pressurize the Yellow Hydraulic System with the Electric Pump
AMM 29-24-00-864-001
Depressurize the Yellow Hydraulic System
AMM 31-60-00-860-001
EIS Start Procedure
AMM 31-60-00-860-002
EIS Stop Procedure
AMM 32-44-11-000-001
Removal of the Accumulator
AMM 32-44-11-200-001
Functional Check of Parking/Emergency Brake Accumulator by Reading the Charge Pressure on the Accumulator Gauge
AMM 32-44-11-400-001
Installation of the Accumulator
3. Fault Confirmation
Subtask 29-13-00-865-058-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/LOW/LVL/IND1832GQN32
121VUHYDRAULIC/HYD/QTY/IND1831GQP35
Subtask 29-13-00-860-066-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, push the HYD pushbutton switch. Make sure that the HYD page is shown on the system display of the ECAM.
   (4) Pressurize the Yellow hydraulic system with the electric pump AMM 29-24-00-863-001.
   (5) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
   (6) Depressurize the Yellow hydraulic system AMM 29-24-00-864-001.
4. Fault Isolation
Subtask 29-13-00-810-069-A
A. If the Fault Confirmation gives:

  • The content indication shows high fluid level on the lower ECAM DU,
    or
  • The content indication shows low fluid level on the lower ECAM DU,
    or
  • The content indication fluctuates between high and low fluid level on the lower ECAM DU after pressurization of the Yellow hydraulic system with the electric pump,
    or the subsequent warnings come into view:
  • The HYD Y ELEC PUMP LO PR on the upper ECAM DU
  • The LO flag of the Yellow hydraulic system on the HYD page of the lower ECAM DU
  • The Yellow ELEC PUMP P/BSW FAULT on panel 40VU

    - Do a visual check of the fluid quantity shown on the mechanical indicator (1834GQ) on the ground service panel of the Green hydraulic system
    - Do a visual check of the fluid quantity shown on the fluid content indicator of the Yellow reservoir
    - Do a check of the pressure of the Yellow power accumulator (3070GM) AMM 29-10-00-200-008
    - Do a check of the pressure of the Yellow brake accumulator (2582GM) AMM 32-44-11-200-001
    - Do a check of the pressure of the Yellow hydraulic reservoir AMM 29-10-00-200-002.
   (1) If the three hydraulic fluid quantity indicators show the same quantity, the pressure of the reservoir and the brake accumulator is correct:
  • But the power accumulator pressure is less than the permitted tolerance:
     (a) Do a check for external gas leaks on the power accumulator and repair the defective components as necessary AMM 29-10-00-200-008.
     (b) If you find no external gas leaks, or the fault continues:
       1 Replace the HYD ACCU YELLOW [3070GM] AMM 29-13-42-000-001 and AMM 29-13-42-400-001.
       2 Do the bleeding procedures of the Yellow hydraulic system AMM 29-00-00-870-004, AMM 29-00-00-870-005, AMM 29-00-00-870-006 and AMM 29-00-00-870-007.
   (2) If the three hydraulic fluid quantity indicators show the same quantity, the pressure of the reservoir and the power accumulator is correct:
  • But the brake accumulator pressure is less than the permitted tolerance:
     (a) Do a check for external gas leaks on the brake accumulator and repair the defective components as necessary AMM 32-44-11-200-001.
     (b) If you find no external gas leaks, or the fault continues:
       1 Replace the ACCU-BRK YELLOW PRESS [2582GM] AMM 32-44-11-000-001 and AMM 32-44-11-400-001.
       2 Do the bleeding procedures of the Yellow hydraulic system AMM 29-00-00-870-004, AMM 29-00-00-870-005, AMM 29-00-00-870-006 and AMM 29-00-00-870-007.
Subtask 29-13-00-860-067-A
B. Do the procedure as given in Para. 3. B. to make sure that the operation of the hydraulic quantity indication is correct.
5. Close-up
Subtask 29-13-00-860-068-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 04:39:57 UTC
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