W DOC AIRBUS | TSM A320F

Overheat Indication of the Blue Hydraulic System

TASK 29-12-00-810-802-A
Overheat Indication of the Blue Hydraulic System

1. Possible Causes
  • internal leakage
  • RELIEF VALVE B SYS [2063GM]
  • LP FILTER B [2002GM]
  • HP-FILTER B [2048GM]
  • [2059GM]
  • CHECK VALVE G [2022GM]
  • CHECK VALVE B [2050GM]
  • CASE DRAIN FILT.ELEC.PUMP B [2084GM]
  • MANIFOLD SWITCH PRESSURE [2380GM]
  • TEMP TRANSM SWITCH-connector plug (2381GR-A)
  • TEMP TRANSM SWITCH [2381GR]
  • SDAC-1 [1WV1]
  • SDAC-2 [1WV2]
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 29-00-00-280-002
Check of the Internal Leakage of the Blue Hydraulic System
AMM 29-00-00-910-003
General Removal and Installation Procedure of the Check Valves in the Hydraulic Systems
AMM 29-10-00-863-003
Pressurize the Blue Hydraulic System with a Hydraulic Ground Power-Cart
AMM 29-10-00-864-003
Depressurize the Blue Hydraulic System
ASM 291201
AMM 29-12-32-000-001
Removal of the Pressure Relief Valve of the Blue Hydraulic System
AMM 29-12-32-400-001
Installation of the Pressure Relief Valve of the Blue Hydraulic System
AMM 29-12-43-610-001
Servicing of the Electric-Pump Case-Drain Filter
AMM 29-12-44-610-001
Servicing of the LP-Filter
AMM 29-12-45-610-001
Servicing of the HP-Filter
ASM 293301
AMM 29-33-11-000-002
Removal of the Temperature Transmitter
AMM 29-33-11-400-002
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
3. Fault Confirmation
Subtask 29-12-00-865-051-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUHYD/HYD PWR/B WARN/& CTL2702GJC12
Subtask 29-12-00-710-051-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) Pressurize the Blue hydraulic system with the electric pump AMM 29-10-00-863-003.
   (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 Isolation
Subtask 29-12-00-810-051-A ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD B RSVR OVHT on the upper ECAM DU
  • The BLUE ELEC 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 2381GR.
   (1) Do a check of the internal leakage of the Blue hydraulic system AMM 29-00-00-280-002.
     (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:

NOTE: If for fault duplication the system is pressurized by a ground power cart, it is necessary to examine also the CHECK VALVE B [2050GM] .
     (b) If the internal leakage is in the given limits:
       1 Do a check of the filter elements of the CASE DRAIN FILT.ELEC.PUMP B [2084GM] , HP-FILTER B [2048GM] and LP FILTER B [2002GM] .
       2 Replace the filter element as necessary AMM 29-12-43-610-001 or AMM 29-12-45-610-001 or AMM 29-12-44-610-001.
Subtask 29-12-00-810-051-B ** ON A/C NOT FOR ALL
A. If the test gives:
  • The message HYD B RSVR OVHT on the upper ECAM DU
  • The BLUE ELEC 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 2381GR.
   (1) Do a check of the internal leakage of the Blue hydraulic system AMM 29-00-00-280-002.
     (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:

NOTE: If for fault duplication, the system is pressurized by a ground power cart, it is necessary to examine also the MANIFOLD SWITCH PRESSURE [2380GM] .
     (b) If the internal leakage is in the given limits:
       1 Do a check of the filter elements of the CASE DRAIN FILT.ELEC.PUMP B [2084GM] , HP-FILTER B [2048GM] and LP FILTER B [2002GM] .
       2 Replace the filter element as necessary AMM 29-12-43-610-001 or AMM 29-12-45-610-001 or AMM 29-12-44-610-001.
Subtask 29-12-00-810-078-A
B. If the test gives:
  • The message HYD B 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 light is not on the OVHT warning condition is only detected by the TEMP XDCRs of the RSVR TEMP sensor FIN 2381GR. It is referred to as a spurious warning from the TEMP XDRCs or wiring or System Data Acquisition Concentrators (SDACs).
   (1) Do a wiring check:
     (a) Disconnect the TEMP TRANSM SWITCH-connector plug (2381GR-A) from the TEMP TRANSM SWITCH [2381GR] 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 [2381GR] ASM 293301.
       1 If there is no continuity, replace the TEMP TRANSM SWITCH [2381GR] AMM 29-33-11-000-002 AMM 29-33-11-400-002.
     (c) Do a check of the continuity between pin A/F and pin A/E of the TEMP TRANSM SWITCH [2381GR] ASM 293301.
       1 If there is no continuity, replace the TEMP TRANSM SWITCH [2381GR] AMM 29-33-11-000-002 AMM 29-33-11-400-002.
     (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 [2381GR] with an OHMMETER MODEL 260.
       1 If the difference is more than 1.5 Ohm between the two measurements, replace the TEMP TRANSM SWITCH [2381GR] AMM 29-33-11-000-002 AMM 29-33-11-000-002.
     (e) If the fault continues, make sure that the wiring is not connected to GND between the TEMP TRANSM SWITCH-connector plug (2381GR-A), pin E and the SDAC-1 [1WV1] connector AB, pin 11A 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 (2381GR-A), pin K and the SDAC-2 [1WV2] connector AB, pin 11A 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 SDAC-1 : B HYD TEMP XMTR 2381GR:
       2 If the test gives the maintenance message SDAC-2 : B HYD TEMP XMTR 2381GR:
Subtask 29-12-00-810-079-A
C. If the test gives:
  • The message HYD B RSVR OVHT on the upper ECAM DU
  • The BLUE ELEC 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 2381GR. 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 [2381GR] ASM 293301.
       1 If there is continuity, replace the TEMP TRANSM SWITCH [2381GR] AMM 29-33-11-000-002 AMM 29-33-11-400-002
       2 If there is no continuity, make sure that the wiring is not connected to GND between TEMP TRANSM SWITCH-connector plug (2381GR-A), pin B and the diode block 1156VD, pin 32 ASM 293301 ASM 291201 .
         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 TEMP TRANSM SWITCH-connector plug (2381GR-A), pin B and the SDAC-1 [1WV1] connector AA, pin 4E 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 TEMP TRANSM SWITCH-connector plug (2381GR-A), pin B and the SDAC-2 [1WV2] connector AA, pin 4E 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 SDAC-1 : B HYD TEMP XMTR 2381GR:
       2 If the test gives the maintenance message SDAC-2 : B HYD TEMP XMTR 2381GR:
Subtask 29-12-00-710-056-A
D. Do the test as given in Para. 3. B. to make sure that operation is correct (no maintenance message shown).
5. Close-up
Subtask 29-12-00-860-051-A
A. Aircraft Maintenance Configuration
   (1) Make sure the Blue hydraulic system is depressurized AMM 29-10-00-864-003.
   (2) Make sure that the aircraft electrical circuits are de-energized AMM 24-41-00-862-002.
[Rev.8 from Aug 2018] 2026.04.04 04:39:53 UTC
"AVIABRAIN" 2025