DOC AIRBUS | TSM A320FIndication of the Hydraulic Fluid Quantity of the Blue Reservoir shows High or Low Level or fluctuates
TASK 29-12-00-810-818-A
Indication of the Hydraulic Fluid Quantity of the Blue Reservoir shows High or Low Level or fluctuates
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 29-12-00-865-064-A
Subtask 29-12-00-810-075-A
Subtask 29-12-00-860-076-A
[Rev.8 from Aug 2018]
2026.04.04 04:39:56 UTC
Indication of the Hydraulic Fluid Quantity of the Blue Reservoir shows High or Low Level or fluctuates
1. Possible Causes
- gas leaks
- HYD ACCU BLUE [2070GM]
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 29-00-00-870-008 | Bleeding Procedure of the Blue Hydraulic System Upstream of the Blue E-Pump |
| AMM 29-00-00-870-009 | Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-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 29-10-00-863-003 | Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart |
| AMM 29-10-00-864-003 | Depressurize the Blue Hydraulic System |
| AMM 29-12-42-000-001 | Removal of the Blue Power Accumulator |
| AMM 29-12-42-400-001 | Installation of the Blue Power Accumulator |
| AMM 31-60-00-860-001 | EIS Start Procedure |
| AMM 31-60-00-860-002 | EIS Stop Procedure |
Subtask 29-12-00-865-064-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-12-00-860-074-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | HYD/HYD PWR/B WARN/& CTL | 2702GJ | C12 |
| 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) Pressurize the Blue hydraulic system with the electric pump AMM 29-10-00-863-003.
(5) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
(6) Depressurize the Blue hydraulic system AMM 29-10-00-864-003.
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) Pressurize the Blue hydraulic system with the electric pump AMM 29-10-00-863-003.
(5) Look for fault indications on the upper ECAM DU, the lower ECAM DU and panel 40VU.
(6) Depressurize the Blue hydraulic system AMM 29-10-00-864-003.
Subtask 29-12-00-810-075-A
A. If the Fault Confirmation gives:
(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 BLUE [2070GM] AMM 29-12-42-000-001 and AMM 29-12-42-400-001.
2 Do the bleeding procedures of the Blue hydraulic system AMM 29-00-00-870-008 and AMM 29-00-00-870-009.
Subtask 29-12-00-860-075-A - 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 Blue hydraulic system with the electric pump,
or the subsequent warnings come into view: - The HYD B ELEC PUMP LO PR on the upper ECAM DU,
- The LO flag of the BLUE hydraulic system on the HYD page of the lower ECAM DU,
- The BLUE 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 Blue reservoir.
- Do a check of the pressure of the Blue system accumulator (2070GM) AMM 29-10-00-200-008.
- Do a check of the pressure of the Blue hydraulic reservoir AMM 29-10-00-200-002.
(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 BLUE [2070GM] AMM 29-12-42-000-001 and AMM 29-12-42-400-001.
2 Do the bleeding procedures of the Blue hydraulic system AMM 29-00-00-870-008 and AMM 29-00-00-870-009.
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 29-12-00-860-076-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.