DOC AIRBUS | TSM A320FOverheat Indication of the Yellow Hydraulic System
TASK 29-13-00-810-802-A
Overheat Indication of the Yellow Hydraulic System
1. Possible Causes
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Fault Confirmation
Subtask 29-13-00-865-052-A
Subtask 29-13-00-810-078-A
Subtask 29-13-00-860-052-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:25 UTC
Overheat Indication of the Yellow Hydraulic System
1. Possible Causes
- CHECK VALVE Y [3083GM]
- PACKAGE E-PUMP [3075GX]
- internal leakage
- RELIEF VALVE Y SYS [3063GM]
- LP FILTER [3002GM]
- HP FILTER Y [3048GM]
- CHECK VALVE G [3022GM]
- BRAKE RELIEF VALVE [3067GM]
- SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ]
- PUMP VARIABLE DTS [3084GM]
TEMP TRANSM SWITCH-connector plug (3381GR-A) - TEMP TRANSM SWITCH [3381GR]
- SDAC-1 [1WV1]
- SDAC-2 [1WV2]
- 3705GD
- PUMP VARIABLE DTS [3030GD]
- FIRE-S.-O.V. [3046GD]
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | OHMMETER MODEL 260 |
| 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 29-00-00-280-003 | Check of the Internal Leakage of the Yellow Hydraulic System |
| AMM 29-00-00-910-003 | General Removal and Installation Procedure of the Check Valves in the Hydraulic Systems |
| AMM 29-10-00-220-001 | Functional Check to Monitor Internal Leak Rate of Yellow and Green Hydraulic Systems |
| AMM 29-13-00-710-002 | Operational Test of the Yellow Hydraulic System |
| ASM 291301 | |
| AMM 29-13-14-000-001 | Removal of the HP Manifold of the Yellow Hydraulic System |
| AMM 29-13-14-400-001 | Installation of the HP Manifold of the Yellow Hydraulic System |
| AMM 29-13-32-000-001 | Removal of the Pressure Relief Valve of the Yellow Hydraulic System |
| AMM 29-13-32-400-001 | Installation of the Pressure Relief Valve of the Yellow Hydraulic System |
| AMM 29-13-43-610-040 | Servicing of the Engine Pump Case-Drain Filter |
| AMM 29-13-43-610-802 | Servicing of the Engine-Pump Case-Drain Filter |
| AMM 29-13-44-610-001 | Servicing of the LP-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 29-24-00-863-001 | Pressurize the Yellow Hydraulic System with the Electric Pump |
| AMM 29-24-00-864-001 | Depressurize the Yellow Hydraulic System |
| AMM 29-24-21-000-001 | Removal of the Yellow E-Pump Check Valve |
| AMM 29-24-21-400-001 | Installation of the Yellow E-Pump Check Valve |
| ASM 293301 | |
| AMM 29-33-11-000-003 | Removal of the Temperature Transmitter |
| AMM 29-33-11-400-003 | Installation of the Temperature Transmitter |
| AMM 31-50-00-710-001 | Ground Scanning of the Central Warning System |
| 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 32-44-15-000-001 | Removal of the Pressure Relief Valve |
| AMM 32-44-15-400-001 | Installation of the Pressure Relief Valve |
| AMM 52-36-12-000-001 | Removal of the Electro-Manual Selector Valve |
| AMM 52-36-12-400-001 | Installation of the Electro-Manual Selector Valve |
Subtask 29-13-00-865-052-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 29-13-00-710-073-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 121VU | HYDRAULIC/Y HYD/PUMP ENG2/MONG | 3700GD | Q37 |
B. Fault Conformation
(1) Do the Operational test of the Yellow hydraulic system AMM 29-13-00-710-002.
(a) Do a check for unusual noise during the test at CHECK VALVE Y [3083GM] and PACKAGE E-PUMP [3075GX] .
(b) If there is more noise than usual, go to Para 4.A.
Subtask 29-13-00-710-051-A (1) Do the Operational test of the Yellow hydraulic system AMM 29-13-00-710-002.
(a) Do a check for unusual noise during the test at CHECK VALVE Y [3083GM] and PACKAGE E-PUMP [3075GX] .
(b) If there is more noise than usual, go to Para 4.A.
C. Test
AMM 24-41-00-861-002.
(2) Pressurize the Yellow hydraulic system with the electric pump AMM 29-24-00-863-001.
(3) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(4) Operate the sidestick for ailerons, spoilers and elevators at full travel for 5 min.
(5) Operate the rudder pedals at full travel for 5 min.
(6) Operate the flap and slat control lever at full travel for 5 min.
4. Fault IsolationWARNING:
PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:
- THE FLIGHT CONTROLS
- THE FLIGHT CONTROL SURFACES
- THE LANDING GEAR AND THE RELATED DOORS
- COMPONENTS THAT MOVE.
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) Energize the aircraft electrical circuitsAMM 24-41-00-861-002.
(2) Pressurize the Yellow hydraulic system with the electric pump AMM 29-24-00-863-001.
(3) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001.
(4) Operate the sidestick for ailerons, spoilers and elevators at full travel for 5 min.
(5) Operate the rudder pedals at full travel for 5 min.
(6) Operate the flap and slat control lever at full travel for 5 min.
Subtask 29-13-00-810-078-A
A. If there is more noise than usual from CHECK VALVE Y [3083GM] or PACKAGE E-PUMP [3075GX] during the test:
(1) Replace the CHECK VALVE Y [3083GM] AMM 29-24-21-000-001 and AMM 29-24-21-400-001.
Subtask 29-13-00-810-054-A ** ON A/C NOT FOR ALL (1) Replace the CHECK VALVE Y [3083GM] AMM 29-24-21-000-001 and AMM 29-24-21-400-001.
NOTE: Failure of CHECK VALVE Y [3083GM] allows a reverse flow of fluid through the Yellow E-pump case drain back to the Yellow Reservoir resulting in possible mechanical damage to the Yellow E-pump.
(2) Do the test in Para 3.C. B. If the test gives:
(a) If the internal leakage is more than permitted:
1 Examine the system to find the defective component.
2 Replace or repair the detective component.
3 Make sure that the manual selector valve of the forward and aft cargo door is not jammed in the OPEN or CLOSE position.
4 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:
1 Do a check of the filter elements of the PUMP VARIABLE DTS [3084GM] HP FILTER Y [3048GM] and LP FILTER [3002GM] .
2 Replace the filter element as necessary AMM 29-13-43-610-040 or AMM 29-13-45-610-001 or AMM 29-13-44-610-001.
Subtask 29-13-00-810-054-D ** ON A/C NOT FOR ALL - The message HYD Y RSVR OVHT on the upper ECAM DU
- The PTU P/BSW FAULT light on panel 40VU
- The YELLOW ENG 2 PUMP P/BSW FAULT light on panel 40VU
- The OVHT flag on the HYD page of the lower ECAM DU.
NOTE: The fault warning system shows that the temperature is more than 95 +2.2 deg.C or -2.2 deg.C (203.00 +3.96 deg.F or -3.96 deg.F). The temperature (TEMP) transducers (XDCRs) and the thermal switch of the reservoir (RSVR) TEMP sensor FIN 3381GR sense this temperature.
(1) Do a check of the internal leakage of the Yellow hydraulic system AMM 29-00-00-280-003 and the PTU AMM 29-10-00-220-001: (a) If the internal leakage is more than permitted:
1 Examine the system to find the defective component.
2 Replace or repair the detective component.
3 Make sure that the manual selector valve of the forward and aft cargo door is not jammed in the OPEN or CLOSE position.
4 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:
- RELIEF VALVE Y SYS [3063GM] AMM 29-13-32-000-001 AMM 29-13-32-400-001
- LP FILTER [3002GM] AMM 29-13-44-610-001
- HP FILTER Y [3048GM] AMM 29-13-45-610-001
- CHECK VALVE G [3022GM] AMM 29-00-00-910-003
- BRAKE RELIEF VALVE [3067GM] AMM 32-44-15-000-001 AMM 32-44-15-400-001
- SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] AMM 52-36-12-000-001 AMM 52-36-12-400-001.
- A fault duplication occurs
- The system is pressurized by a ground power cart
- The system is pressurized by a Engine Driven Pump (EDP).
1 Do a check of the filter elements of the PUMP VARIABLE DTS [3084GM] HP FILTER Y [3048GM] and LP FILTER [3002GM] .
2 Replace the filter element as necessary AMM 29-13-43-610-040 or AMM 29-13-45-610-001 or AMM 29-13-44-610-001.
B. If the test gives:
(a) If the internal leakage is more than permitted:
1 Examine the system to find the defective component.
2 Replace or repair the detective component.
3 Make sure that the manual selector valve of the forward and aft cargo door is not jammed in the OPEN or CLOSE position.
4 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:
1 Do a check of the filter elements of the PUMP VARIABLE DTS [3084GM] HP FILTER Y [3048GM] and LP FILTER [3002GM] .
2 Replace the filter element as necessary AMM 29-13-43-610-802 or AMM 29-13-45-610-001 or AMM 29-13-44-610-001.
Subtask 29-13-00-810-073-A - The message HYD Y RSVR OVHT on the upper ECAM DU
- The PTU P/BSW FAULT light on panel 40VU
- The YELLOW ENG 2 PUMP P/BSW FAULT light on panel 40VU
- The OVHT flag on the HYD page of the lower ECAM DU.
NOTE: The fault warning system shows that the temperature is more than 100 +2.2 deg.C or -2.2 deg.C (212.00 +3.96 deg.F or -3.96 deg.F). The temperature (TEMP) transducers (XDCRs) and the thermal switch of the reservoir (RSVR) TEMP sensor FIN 3381GR sense this temperature.
(1) Do a check of the internal leakage of the Yellow hydraulic system AMM 29-00-00-280-003 and the PTU AMM 29-10-00-220-001: (a) If the internal leakage is more than permitted:
1 Examine the system to find the defective component.
2 Replace or repair the detective component.
3 Make sure that the manual selector valve of the forward and aft cargo door is not jammed in the OPEN or CLOSE position.
4 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:
- RELIEF VALVE Y SYS [3063GM] AMM 29-13-32-000-001 AMM 29-13-32-400-001
- LP FILTER [3002GM] AMM 29-13-44-610-001
- HP FILTER Y [3048GM] AMM 29-13-45-610-001
- CHECK VALVE G [3022GM] AMM 29-00-00-910-003
- BRAKE RELIEF VALVE [3067GM] AMM 32-44-15-000-001 AMM 32-44-15-400-001
- SEL VALVE-CARGO DOORS ELEC/MAN CTL [2500MJ] AMM 52-36-12-000-001 AMM 52-36-12-400-001.
- A fault duplication occurs
- The system is pressurized by a ground power cart
- The system is pressurized by a Engine Driven Pump (EDP).
1 Do a check of the filter elements of the PUMP VARIABLE DTS [3084GM] HP FILTER Y [3048GM] and LP FILTER [3002GM] .
2 Replace the filter element as necessary AMM 29-13-43-610-802 or AMM 29-13-45-610-001 or AMM 29-13-44-610-001.
C. If the test gives:
(a) Disconnect theTEMP TRANSM SWITCH-connector plug (3381GR-A) from the TEMP TRANSM SWITCH [3381GR] and do a visual check of the connector's integrity.
1 If the connector is not in the correct condition:
1 If there is no continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(c) Do a check of the continuity between pin A/F and pin A/E of the TEMP TRANSM SWITCH [3381GR] ASM 293301.
1 If there is no continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(d) Measure the DC resistance between the pins A/G and A/K and between the pins A/E and A/F of the TEMP TRANSM SWITCH [3381GR] with an OHMMETER MODEL 260.
1 If the difference is more than 1.5 Ohm between the two measurements, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(e) If the fault continues, make sure that the wiring is not connected to GND between theTEMP TRANSM SWITCH-connector plug (3381GR-A) , pin E and the SDAC-1 [1WV1] connector AE, pin 12J ASM 293301.
1 If the wiring is connected to GND, repair the wiring as necessary.
(f) If the fault continues, make sure that the wiring is not connected to GND between theTEMP TRANSM SWITCH-connector plug (3381GR-A) , pin K and the SDAC-2 [1WV2] connector AE, pin 12J ASM 293301.
1 If the wiring is connected to GND, repair the wiring as necessary.
(g) If the fault continues, do the operational test of the central warning system AMM 31-50-00-710-001.
1 If the test gives the maintenance message SDAC1 : Y HYD TEMP XMTR 3381GR:
Subtask 29-13-00-810-074-A - The message HYD Y RSVR OVHT on the upper ECAM DU
- The OVHT flag on the HYD page of the lower ECAM DU.
NOTE: If the P/BSW FAULT lights are not on, this confirms that the OVHT warning condition is only detected by the TEMP XDCRs of the RSVR TEMP sensor FIN 3381GR. It is referred to as a spurious warning from the TEMP XDCRs or wiring or System Data Acquisition Concentrators (SDACs).
(1) Do a wiring check: (a) Disconnect the
1 If the connector is not in the correct condition:
- Replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003 and replace the
TEMP TRANSM SWITCH-connector plug (3381GR-A) .
1 If there is no continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(c) Do a check of the continuity between pin A/F and pin A/E of the TEMP TRANSM SWITCH [3381GR] ASM 293301.
1 If there is no continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(d) Measure the DC resistance between the pins A/G and A/K and between the pins A/E and A/F of the TEMP TRANSM SWITCH [3381GR] with an OHMMETER MODEL 260.
1 If the difference is more than 1.5 Ohm between the two measurements, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
(e) If the fault continues, make sure that the wiring is not connected to GND between the
1 If the wiring is connected to GND, repair the wiring as necessary.
(f) If the fault continues, make sure that the wiring is not connected to GND between the
1 If the wiring is connected to GND, repair the wiring as necessary.
(g) If the fault continues, do the operational test of the central warning system AMM 31-50-00-710-001.
1 If the test gives the maintenance message SDAC1 : Y HYD TEMP XMTR 3381GR:
- Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 AMM 31-55-34-400-001.
- Replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 AMM 31-55-34-400-001.
D. If the test gives:
(a) Do a check of the continuity between pin A/A and pin A/B of the TEMP TRANSM SWITCH [3381GR] ASM 293301.
1 If there is continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
2 If there is no continuity, make sure that the wiring is not connected to GND between theTEMP TRANSM SWITCH-connector plug (3381GR-A) , pin B and the 3705GD pin Z ASM 293301 and ASM 291301.
a If the wiring is connected to GND, repair the wiring as necessary.
(b) If the fault continues, make sure that the wiring is not connected to GND between theTEMP TRANSM SWITCH-connector plug (3381GR-A) , pin B and the SDAC-1 [1WV1] connector AD, pin 4G ASM 293301.
1 If the wiring is connected to GND, repair the wiring as necessary.
(c) If the fault continues, make sure that the wiring is not connected to GND between theTEMP TRANSM SWITCH-connector plug (3381GR-A) , pin B and the SDAC-2 [1WV2] connector AD, pin 4G ASM 293301.
1 If the wiring is connected to GND, repair the wiring as necessary.
(d) If the fault continues, do the operational test of the central warning system AMM 31-50-00-710-001.
1 If the test gives the maintenance message SDAC1 : Y HYD TEMP XMTR 3381GR:
Subtask 29-13-00-810-065-A ** ON A/C NOT FOR ALL - The message HYD Y RSVR OVHT on the upper ECAM DU
- The PTU P/BSW FAULT light on panel 40VU
- The YELLOW ENG 2 PUMP P/BSW FAULT light on panel 40VU.
NOTE: If the OVHT flag is not shown on the HYD page of the lower ECAM DU, this confirms that the OVHT warning condition is only detected by the thermal switch of the RSVR TEMP sensor FIN 3381GR. It is referred to as a spurious warning from the thermal switch or wiring or SDACs.
(1) Do a wiring check: (a) Do a check of the continuity between pin A/A and pin A/B of the TEMP TRANSM SWITCH [3381GR] ASM 293301.
1 If there is continuity, replace the TEMP TRANSM SWITCH [3381GR] AMM 29-33-11-000-003 AMM 29-33-11-400-003.
2 If there is no continuity, make sure that the wiring is not connected to GND between the
a If the wiring is connected to GND, repair the wiring as necessary.
(b) If the fault continues, make sure that the wiring is not connected to GND between the
1 If the wiring is connected to GND, repair the wiring as necessary.
(c) If the fault continues, make sure that the wiring is not connected to GND between the
1 If the wiring is connected to GND, repair the wiring as necessary.
(d) If the fault continues, do the operational test of the central warning system AMM 31-50-00-710-001.
1 If the test gives the maintenance message SDAC1 : Y HYD TEMP XMTR 3381GR:
- Replace the SDAC-1 [1WV1] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
- Replace the SDAC-2 [1WV2] AMM 31-55-34-000-001 and AMM 31-55-34-400-001.
E. If the test gives:
(a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-003 and AMM 29-13-51-400-003.
Subtask 29-13-00-810-065-B ** ON A/C NOT FOR ALL - No message on the upper and lower ECAM DUs
- No FAULT lights illumination.
NOTE: No OVHT warning is found, when the Yellow hydraulic system is pressurized with the Yellow Electric Motor Pump (Y EMP).
(1) Remove the CHECK VALVE Y [3083GM] AMM 29-24-21-000-001. (a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
- Examine the HP FILTER Y [3048GM] AMM 29-13-45-610-001
- Remove and install the Yellow HP manifold AMM 29-13-14-000-001 and AMM 29-13-14-400-001.
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-003 and AMM 29-13-51-400-003.
E. If the test gives:
(a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-004 and AMM 29-13-51-400-004.
Subtask 29-13-00-810-065-D ** ON A/C NOT FOR ALL - No message on the upper and lower ECAM DUs
- No FAULT lights illumination.
NOTE: No OVHT warning is found, when the Yellow hydraulic system is pressurized with the Yellow Electric Motor Pump (Y EMP).
(1) Remove the CHECK VALVE Y [3083GM] AMM 29-24-21-000-001. (a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
- Examine the HP FILTER Y [3048GM] AMM 29-13-45-610-001
- Remove and install the Yellow HP manifold AMM 29-13-14-000-001 and AMM 29-13-14-400-001.
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-004 and AMM 29-13-51-400-004.
E. If the test gives:
(a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-806 and AMM 29-13-51-400-806.
Subtask 29-13-00-710-055-A - No message on the upper and lower ECAM DUs
- No FAULT lights illumination.
NOTE: No OVHT warning is found, when the Yellow hydraulic system is pressurized with the Yellow Electric Motor Pump (Y EMP).
(1) Remove the CHECK VALVE Y [3083GM] AMM 29-24-21-000-001. (a) Do a visual inspection of the CHECK VALVE Y [3083GM] for damage and missing parts.
1 If parts are missing, do the steps that follow before you install the new CHECK VALVE Y:
- Examine the HP FILTER Y [3048GM] AMM 29-13-45-610-001
- Remove and install the Yellow HP manifold AMM 29-13-14-000-001 and AMM 29-13-14-400-001.
(3) 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.
(4) If the fault continues:
(a) Replace the PUMP VARIABLE DTS [3030GD] AMM 29-13-51-000-806 and AMM 29-13-51-400-806.
F. When the FIRE-S.-O.V. [3046GD] was not the cause of the malfunction:
5. Close-up- Do the test as given in Para. 3. C. to make sure that operation is correct (no message shown).
Subtask 29-13-00-860-052-A
A. Aircraft Maintenance Configuration
(1) Make sure that the Yellow hydraulic system is de-pressurrized AMM 29-24-00-864-001.
(2) Make sure that the aircraft electrical circuits are de-energized AMM 24-41-00-862-002.
(1) Make sure that the Yellow hydraulic system is de-pressurrized AMM 29-24-00-864-001.
(2) Make sure that the aircraft electrical circuits are de-energized AMM 24-41-00-862-002.