DOC AIRBUS | TSM A320FIndication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High Level
TASK 29-13-00-810-814-A
Indication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High Level
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 29-13-00-865-057-A
Subtask 29-13-00-810-068-A
Subtask 29-13-00-860-065-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:26 UTC
Indication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High Level
1. Possible Causes
- gas leaks
- ACCU-BRK YELLOW PRESS [2582GM]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 29-13-00-810-801-A | Loss of the Correct Quantity in the Yellow Hydraulic Reservoir |
| TSM TASK 29-13-00-810-803-A | Loss of the Yellow Reservoir Pressurization |
| TSM TASK 29-13-00-810-815-A | Indication of the Hydraulic Fluid Quantity of the Yellow Reservoir shows High or Low Level or fluctuates |
| 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 29-10-00-680-002 | Drainage of the Reservoir of the Yellow Hydraulic System |
| AMM 29-14-00-614-002 | Pressurization of the Hydraulic Reservoirs through the Ground Connector |
| 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 |
Subtask 29-13-00-865-057-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-13-00-860-063-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/LOW/LVL/IND | 1832GQ | N32 |
| 121VU | HYDRAULIC/HYD/QTY/IND | 1831GQ | P35 |
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) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
4. Fault Isolation(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) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
Subtask 29-13-00-810-068-A
A. If the Fault Confirmation gives:
(2) If the three hydraulic fluid quantity indicators show high level and the pressures of the power and the brake accumulators and the reservoir are correct:
(a) Drain the hydraulic fluid until you have the correct fluid quantity in the reservoir AMM 29-10-00-680-002.
(b) Pressurize the reservoir of the Yellow hydraulic system AMM 29-14-00-614-002.
(3) If the three hydraulic fluid quantity indicators show high level, the pressures of the power and brake accumulators are correct:
(b) If you find no external gas leaks, or the fault continues:
1 Do the troubleshooting for the loss of the reservoir pressurization (Ref. TSM TASK 29-13-00-810-803).
2 Drain the hydraulic fluid until you have the correct fluid quantity in the reservoir AMM 29-10-00-680-002.
3 Pressurize the reservoir of the Yellow hydraulic system AMM 29-14-00-614-002.
4 After 5 minutes, read the gage of the fluid quantity indicator of the Yellow reservoir.
a If the difference of the fluid quantity is not more than 1 liter:
1 Do the troubleshooting procedure (Ref. TSM TASK 29-13-00-810-815).
(4) If the three hydraulic fluid quantity indicators show high level, the pressure of the reservoir and the brake accumulator are correct:
(5) If the three hydraulic fluid quantity indicators show high level, the pressure of the reservoir and the power accumulator are correct:
(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 for 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 29-13-00-860-064-A - The content indication shows high fluid level on the lower ECAM DU:
- Do a visual check of the fluid quantity shown on the reservoir quantity 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 nitrogen pressure of the Yellow power accumulator (3070GM) AMM 29-10-00-200-008
- Do a check of the nitrogen 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.
NOTE: The maximum permitted difference between the quantity indicators is 0.8 liter.
(a) Do the troubleshooting of the quantity indication system (Ref. TSM TASK 29-13-00-810-801). (2) If the three hydraulic fluid quantity indicators show high level and the pressures of the power and the brake accumulators and the reservoir are correct:
(a) Drain the hydraulic fluid until you have the correct fluid quantity in the reservoir AMM 29-10-00-680-002.
(b) Pressurize the reservoir of the Yellow hydraulic system AMM 29-14-00-614-002.
(3) If the three hydraulic fluid quantity indicators show high level, the pressures of the power and brake accumulators are correct:
- But the reservoir pressure is less than the permitted tolerance:
(b) If you find no external gas leaks, or the fault continues:
1 Do the troubleshooting for the loss of the reservoir pressurization (Ref. TSM TASK 29-13-00-810-803).
2 Drain the hydraulic fluid until you have the correct fluid quantity in the reservoir AMM 29-10-00-680-002.
3 Pressurize the reservoir of the Yellow hydraulic system AMM 29-14-00-614-002.
4 After 5 minutes, read the gage of the fluid quantity indicator of the Yellow reservoir.
a If the difference of the fluid quantity is not more than 1 liter:
- No more actions are necessary.
- 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.
1 Do the troubleshooting procedure (Ref. TSM TASK 29-13-00-810-815).
(4) If the three hydraulic fluid quantity indicators show high level, the pressure of the reservoir and the brake accumulator are correct:
- But the power accumulator pressure is less than the permitted tolerance:
(5) If the three hydraulic fluid quantity indicators show high level, the pressure of the reservoir and the power accumulator are correct:
- But the brake accumulator pressure is less than the permitted tolerance:
(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 for 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.
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-upSubtask 29-13-00-860-065-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.
(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.