W DOC AIRBUS | TSM A320F

Overheat Indication of the Green Hydraulic System

TASK 29-11-00-810-802-A
Overheat Indication of the Green Hydraulic System

1. Possible Causes
  • internal leakage
  • RELIEF VALVE G SYS [1063GM]
  • LP FILTER [1002GM]
  • HP FILTER G [1048GM]
  • [1059GM]
  • CHECK VALVE G [1022GM]
  • FILTER-ENG PUMP CASE DRAIN [1084GM]
  • TEMP TRANSM SWITCH-connector plug (1381GR-A)
  • TEMP TRANSM SWITCH [1381GR]
  • SDAC-1 [1WV1]
  • SDAC-2 [1WV2]
  • RELAY-G RSVR OVHT FAULT (1708GK)
  • SAFETY VALVE-L/G SYS ISOLATION [49GA]
  • [40GA]
  • [41GA]
  • PTU [1088GM]
  • FIRE-S.-O.V. [1046GK]
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
1
OHMMETER MODEL 260
 B. 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 29-00-00-280-001
Check of the Internal Leakage of the Green Hydraulic System
AMM 29-00-00-280-004
Check of the Internal Leakage of the Power Transfer Unit (PTU)
AMM 29-00-00-280-006
Check of the Green or Yellow Hydraulic System after Engine Pump Failure or Operation in a Possible Cavitation Condition - with Ground Cart Available
AMM 29-00-00-910-003
General Removal and Installation Procedure of the Check Valves in the Hydraulic Systems
AMM 29-10-00-710-001
Operational Check of Hydraulic Fire Shut Off Valves and Associated Indicating System
ASM 291101
AMM 29-11-32-000-001
Removal of the Pressure Relief Valve of the Green Hydraulic System
AMM 29-11-32-400-001
Installation of the Pressure Relief Valve of the Green Hydraulic System
AMM 29-11-43-610-040
Servicing of the Engine-Pump Case-Drain Filter
AMM 29-11-44-610-001
Servicing of the LP-Filter
AMM 29-11-45-610-001
Servicing of the HP-Filter
ASM 293301
AMM 29-33-11-000-001
Removal of the Temperature Transmitter
AMM 29-33-11-400-001
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 71-00-00-710-003
Engine Automatic Start
AMM 71-00-00-710-028
Engine Shutdown
3. Fault Confirmation
Subtask 29-11-00-865-052-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
121VUHYDRAULIC/G HYD/PUMP ENG1/MONG1702GKR34
Subtask 29-11-00-710-051-A
B. Test
WARNING: 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.
MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.
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 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) Do an Engine Automatic Start to pressurize the Green hydraulic system AMM 71-00-00-710-003.
   (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 Isolation
Subtask 29-11-00-810-051-A ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD G RSVR OVHT on the upper ECAM DU
  • The PTU P/BSW FAULT light on panel 40VU
  • The GREEN ENG 1 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). This was detected by the temperature (TEMP) transducers (XDCRs) and the thermal switch of the reservoir (RSVR) TEMP sensor FIN 1381GR.
   (1) Do a check of the internal leakage of the Green hydraulic system AMM 29-00-00-280-001 and the PTU AMM 29-00-00-280-004.
     (a) If the internal leakage is more than permitted:
  • Examine the system to find the defective component
  • Replace or repair the defective component.
       1 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:


     (b) If the internal leakage is in the given limits:
       1 Do a check of the filter elements of the FILTER-ENG PUMP CASE DRAIN [1084GM] , HP FILTER G [1048GM] and LP FILTER [1002GM] .
       2 Replace the filter element as necessary AMM 29-11-43-610-040 or AMM 29-11-45-610-001 or AMM 29-11-44-610-001.
Subtask 29-11-00-810-051-C ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD G RSVR OVHT on the upper ECAM DU
  • The PTU P/BSW FAULT light on panel 40VU
  • The GREEN ENG 1 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). This was detected by the temperature (TEMP) transducers (XDCRs) and the thermal switch of the reservoir (RSVR) TEMP sensor FIN 1381GR.
   (1) Do a check of the internal leakage of the Green hydraulic system AMM 29-00-00-280-001 and the PTU AMM 29-00-00-280-004.
     (a) If the internal leakage is more than permitted:
  • Examine the system to find the defective component
  • Replace or repair the defective component.
       1 Do a check for local increase of the temperature and unusual noise at the components that follow. Replace the components as necessary:


     (b) If the internal leakage is in the given limits:
       1 Do a check of the filter elements of the FILTER-ENG PUMP CASE DRAIN [1084GM] , HP FILTER G [1048GM] and LP FILTER [1002GM] .
       2 Replace the filter element as necessary AMM 29-11-43-610-040 or AMM 29-11-45-610-001 or AMM 29-11-44-610-001.
Subtask 29-11-00-810-070-A
B. If the test gives:
  • The message HYD G 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, the OVHT warning condition is only detected by the TEMP XDCRs of the RSVR TEMP sensor FIN 1381GR. 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 TEMP TRANSM SWITCH-connector plug (1381GR-A) from the TEMP TRANSM SWITCH [1381GR] and do a visual check of the connector's integrity.
       1 If the connector is not in the correct condition:
     (b) Do a check of the continuity between pin A/G and pin A/K of the TEMP TRANSM SWITCH [1381GR] ASM 293301.
       1 If there is no continuity, replace the TEMP TRANSM SWITCH [1381GR] AMM 29-33-11-000-001 AMM 29-33-11-400-001.
     (c) Do a check of the continuity between pin A/F and pin A/E of the TEMP TRANSM SWITCH [1381GR] ASM 293301.
       1 If there is no continuity, replace the TEMP TRANSM SWITCH [1381GR] AMM 29-33-11-000-001 AMM 29-33-11-400-001.
     (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 [1381GR] with an OHMMETER MODEL 260.
       1 If the difference is more than 1.5 Ohm between the two measurements, replace the TEMP TRANSM SWITCH [1381GR] AMM 29-33-11-000-001 AMM 29-33-11-400-001.
     (e) If the fault continues, make sure that the wiring is not connected to GND between the TEMP TRANSM SWITCH-connector plug (1381GR-A), pin E and the SDAC-1 [1WV1] connector AB, pin 12A 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 the TEMP TRANSM SWITCH-connector plug (1381GR-A), pin K and the SDAC-2 [1WV2] connector AB, pin 12A 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 : G HYD TEMP XMTR 1381GR:
       2 If the test gives the maintenance message SDAC2 : G HYD TEMP XMTR 1381GR:
Subtask 29-11-00-810-071-A
C. If the test gives:
  • The message HYD G RSVR OVHT on the upper ECAM DU
  • The PTU P/BSW FAULT light on panel 40VU
  • The GREEN ENG 1 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, the OVHT warning condition is only detected by the thermal switch of the RSVR TEMP sensor FIN 1381GR. 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 [1381GR] ASM 293301.
       1 If there is continuity, replace the TEMP TRANSM SWITCH [1381GR] AMM 29-33-11-000-001 AMM 29-33-11-400-001.
       2 If there is no continuity, make sure that the wiring is not connected to GND between the TEMP TRANSM SWITCH-connector plug (1381GR-A), pin B and the RELAY-G RSVR OVHT FAULT (1708GK), pin Z ASM 293301 ASM 291101.
         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 TEMP TRANSM SWITCH-connector plug (1381GR-A), pin B and the SDAC-1 [1WV1] connector AA, pin 4A 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 the TEMP TRANSM SWITCH-connector plug (1381GR-A), pin B and the SDAC-2 [1WV2] connector AA, pin 4A 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 : G HYD TEMP XMTR 1381GR:
       2 If the test gives the maintenance message SDAC2 : G HYD TEMP XMTR 1381GR:
Subtask 29-11-00-810-063-A
D. If the test gives:
  • No messages on the upper and lower ECAM DU
  • No FAULT lights on the panel 40VU.

   (1) Do a check of the internal leakage of the Green hydraulic system AMM 29-00-00-280-001.
     (a) If the internal leakage is more than permitted:
  • Examine the system to find the defective component
  • Replace or repair the defective component.
  • Do a check for local increase of the temperature and unusual noise of SAFETY VALVE-L/G SYS ISOLATION [49GA] , [40GA] and [41GA] .
  • Do a test for internal leakage of the PTU [1088GM] AMM 29-00-00-280-004.
   (2) Do the operational test of the VALVE-G PUMP FIRE, ENG 1 FIRE-S.-O.V. [1046GK] AMM 29-10-00-710-001.
NOTE: If the VALVE-G PUMP FIRE, ENG 1 FIRE-S.-O.V. [1046GK] is not in the fully open position, this can be the cause of an overheat of the hydraulic system.
   (3) If the operational test gives an unsatisfactory operation of the VALVE-G PUMP FIRE, ENG 1 FIRE-S.-O.V. [1046GK] , replace the VALVE-G PUMP FIRE, ENG 1 FIRE-S.-O.V. [1046GK] :
   (4) Do a check of the engine pump for a possible cavitation condition AMM 29-00-00-280-006.
NOTE: A cavitation condition of the engine pump is possible when the engine pump operates with the engine pump fire valve closed (if you set the ENG 1 (2) FIRE pushbutton on the Eng/APU fire panel), or with the reservoir below the low level (ECAM indication).
Subtask 29-11-00-710-056-A
E. When the FIRE-S.-O.V. [1046GK] was not the cause of the malfunction:
  • Do the test as given in Para. 3. B. to make sure that operation is correct (no message shown).
5. Close-up
Subtask 29-11-00-860-052-A
A. Aircraft Maintenance Configuration
   (1) Stop the Engine AMM 71-00-00-710-028.
   (2) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:29:19 UTC
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