W DOC AIRBUS | TSM A320F

The oil temperature of engine 1 and engine 2 are significantly different

TASK 79-00-00-810-835-A
The oil temperature of engine 1 and engine 2 are significantly different

1. Possible Causes
  • IDG
  • fuel return valve
  • oil/fuel heat exchanger
  • low fuel level
  • fuel in surge tank
  • boost pumps off
  • SENSOR-TEMP, LEFT WING TK OUTER CHANNEL A [30QJ1]
  • SENSOR-TEMP, RIGHT WING TK OUTER CHANNEL A [30QJ2]
  • SENSOR-TEMP, LEFT WING TK INNER CHANNEL A [29QJ1]
  • SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A [29QJ2]
  • SENSOR-LOW LEVEL, LEFT WING TK INNER CHANNEL A [38QJ1]
  • SENSOR-LOW LEVEL, RIGHT WING TK INNER CHANNEL A [38QJ2]
  • SENSOR-HIGH LVL, LEFT WING SURGE TK CHANNEL A [28QJ1]
  • SENSOR-HIGH LVL, RIGHT WING SURGE TK CHANNEL A [28QJ2]
  • FLSCU-1 [7QJ]
  • FLSCU-2 [9QJ]
  • SENSOR-OIL TEMP [4004EN]
  • EIU
  • engine oil temperature sensor
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
TSM TASK 28-46-00-810-812-A
L(R) Surge Tank Overflow Sensor 28QJ1(2)
TSM TASK 28-46-00-810-813-A
L(R) Inner Temperature Sensor 29QJ1(2)
TSM TASK 28-46-00-810-814-A
L(R) Outer Temperature Sensor 30QJ1(2)
TSM TASK 28-46-00-810-815-A
L(R) IDG Shut Off Sensor 38QJ1(2)
TSM TASK 28-46-00-810-818-A
FLSCU1(2) 7QJ(9QJ)
AMM 71-00-00-710-006
Minimum Idle Check
AMM 71-51-43-000-001
Removal of the Left Side Harness
AMM 71-51-43-400-001
Installation of the Left Side Harness
AMM 71-51-44-000-007
Removal of the Left Side Harness 238W0904
AMM 71-51-44-400-007
Installation of the Left Side Harness 238W0904
AMM 73-11-50-000-001
Removal of the Fuel Return Valve
AMM 73-11-50-000-002
Removal of the Fuel Return Valve (FRV)
AMM 73-11-50-360-002
Leak Check and Functional Test of the Fuel Return Valve
AMM 73-11-50-400-001
Installation of the Fuel Return Valve
AMM 73-11-50-400-002
Installation of the Fuel Return Valve
AMM 73-11-50-720-001
Functional Test of the Fuel Return Valve
AMM 73-21-60-000-001
Removal of the Electronic Control Unit (ECU)
AMM 73-21-60-400-001
Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040
Operational Test of the FADEC on the ground (with Engine Motoring)
AMM 79-00-00-281-002
Check of the Electrical Master Chip Detector (EMCD) for Particles
AMM 79-21-10-210-002
Check of the Lubrication Unit Magnetic Plugs and Scavenge Screens
AMM 79-21-20-000-001
Removal of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-000-002
Removal of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-400-001
Installation of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-400-002
Installation of the Main Oil/Fuel Heat Exchanger
AMM 79-32-15-000-001
Removal Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-32-15-000-040
Removal of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
AMM 79-32-15-000-041
Removal of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
AMM 79-32-15-000-042
Removal of the Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-32-15-400-001
Installation Oil Temperature Sensor (IDG Cooling System Control Sensor)
AMM 79-32-15-400-040
Installation of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
AMM 79-32-15-400-041
Installation of the Oil Temperature Sensor (Engine Condition Monitoring Sensor)
AMM 79-32-15-400-042
Installation of the Oil Temperature Sensor (IDG Cooling System Control Sensor)
ASM 793601
3. Fault Confirmation
Subtask 79-00-00-710-108-A ** ON A/C NOT FOR ALL
A. Test
   (1) Not applicable.
4. Fault Isolation
Subtask 79-00-00-810-095-A ** ON A/C NOT FOR ALL
A. A too high oil temperature can be due to one of the following failures:
- too high IDG oil temperature,
- fuel return valve failure (closed),
- oil/fuel heat exchanger failure,
- engine oil temperature sensor failure (input parameter for fuel return valve control),
- aircraft oil temperature sensor failure (cockpit indication),
- forced fuel return valve closure in case of too high fuel temperature in the tank (above 55 deg. C or 131 deg. F), too low fuel level in the tank(s), presence of fuel in surge tank or boost pumps off .
NOTE: Do the following trouble shooting on the engine exhibiting the highest oil temperature unless the oil temperature on one engine is significantly lower compared to previous flights trend indications.
NOTE: In case the idle speed on one engine is higher than other engine (engine running in modulated engine mode), do the following trouble shooting on the engine running with the highest idle.
   (1) Read the post flight report (PFR) and check for failure messages:
     (a) If you find any message(s) including the following words: FRV, IDG, EOT SNSR, SENSOR OIL TEMP do the trouble shooting related to the failure message(s) displayed (TSM CFDS chapter 73 and 79).
     (b) If one of the following failure messages relative to fuel system elements is displayed:
       1 FUEL LEVEL SENSING L OUT TEMP SENSOR 30QJ1 or FUEL LEVEL SENSING R OUT TEMP SENSOR 30QJ2
       2 FUEL LEVEL SENSING L INN TEMP SENSOR 29QJ1 or FUEL LEVEL SENSING R INN TEMP SENSOR 29QJ2
       3 FUEL LEVEL SENSING L LO LEVEL SENSOR 38QJ1 or FUEL LEVEL SENSING R LO LEVEL SENSOR 38QJ2
       4 FUEL LEVEL SENSING L SURGE SENSOR 28QJ1 or FUEL LEVEL SENSING R SURGE SENSOR 28QJ2
       5 FUEL LEVEL SENSING FLSCU1 7QJ or FUEL LEVEL SENSING FLSCU2 7QJ
   (2) If the engine oil temperature is higher than the IDG oil outlet temperature (on ECAM ELEC page):
     (a) If the fault continues:
  • check the electrical wiring between the oil temperature sensor 4004EN and the EIU for abnormal resistance (too high, more than 2 ohms). Pay particular attention to electrical connector at engine to pylon interface and to ground wire connections 9951DC, 9956DC, and 9957DC on Engine Fan Case AMM 71-51-44-000-007 and AMM 71-51-44-400-007 for looseness or contamination ASM 793601.
   (3) If the IDG oil outlet temperature is also too high and/or the IDG OIL OVHT warning has been triggered:
  • do the related trouble shooting procedure.
   (4) If no IDG related fault is present and if the IDG oil outlet temperature is normal:
     (a) Get a sample of oil from the engine oil tank. If you can smell fuel presence in the engine oil:
     (b) Do a check of the lubrication unit magnetic plugs and screens AMM 79-21-10-210-002:
  • if no fault is found:
       1 do a functional test of the fuel return valve AMM 73-11-50-720-001:
  • if the fuel return valve operates as expected:
    . no maintenance action is required,
  • if the fuel return valve does not operate during the test:
    . replace the valve AMM 73-11-50-000-001 and AMM 73-11-50-400-001.
       2 if no fault is found:
       3 if the fault continues:
       4 if the fault continues:
       5 if the fault continues:
  • do an oil analysis to make sure the engine oil tank was not serviced with a non approved product.
   (5) Do a functional test of the fuel return valve AMM 73-11-50-720-001.
     (a) If the fuel return valve operates as expected no maintenance action is required.
     (b) If the fuel return valve does not operate during the test replace the valve AMM 73-11-50-000-001 AMM 73-11-50-400-001.
Subtask 79-00-00-810-095-B ** ON A/C NOT FOR ALL
A. A too high oil temperature can be due to one of the following failures:
- too high IDG oil temperature,
- fuel return valve failure (closed),
- oil/fuel heat exchanger failure,
- engine oil temperature sensor failure (input parameter for fuel return valve control),
- aircraft oil temperature sensor failure (cockpit indication),
- forced fuel return valve closure in case of too high fuel temperature in the tank (above 55 deg. C or 131 deg. F), too low fuel level in the tank(s), presence of fuel in surge tank or boost pumps off .
NOTE: Do the following trouble shooting on the engine exhibiting the highest oil temperature unless the oil temperature on one engine is significantly lower compared to previous flights trend indications.
NOTE: In case the idle speed on one engine is higher than other engine (engine running in modulated engine mode), do the following trouble shooting on the engine running with the highest idle.
   (1) Read the post flight report (PFR) and check for failure messages:
     (a) If you find any message(s) including the following words: FRV, IDG, EOT SNSR, SENSOR OIL TEMP do the trouble shooting related to the failure message(s) displayed (TSM CFDS chapter 73 and 79).
     (b) If one of the following failure messages relative to fuel system elements is displayed:
       1 FUEL LEVEL SENSING L OUT TEMP SENSOR 30QJ1 or FUEL LEVEL SENSING R OUT TEMP SENSOR 30QJ2
       2 FUEL LEVEL SENSING L INN TEMP SENSOR 29QJ1 or FUEL LEVEL SENSING R INN TEMP SENSOR 29QJ2
  • do the applicable trouble shooting procedure for SENSOR-TEMP, LEFT WING TK INNER CHANNEL A or SENSOR-TEMP, LEFT WING TK INNER CHANNEL A [29QJ1] ( SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A or SENSOR-TEMP, RIGHT WING TK INNER CHANNEL A [29QJ2] ) (Ref. TSM TASK 28-46-00-810-813).
       3 FUEL LEVEL SENSING L LO LEVEL SENSOR 38QJ1 or FUEL LEVEL SENSING R LO LEVEL SENSOR 38QJ2
       4 FUEL LEVEL SENSING L SURGE SENSOR 28QJ1 or FUEL LEVEL SENSING R SURGE SENSOR 28QJ2
       5 FUEL LEVEL SENSING FLSCU1 7QJ or FUEL LEVEL SENSING FLSCU2 7QJ
   (2) If the engine oil temperature is higher than the IDG oil outlet temperature (on ECAM ELEC page):
     (a) If the fault continues:
  • check the electrical wiring between the oil temperature sensor 4004EN and the EIU for abnormal resistance (too high, more than 2 ohms). Pay particular attention to electrical connector at engine to pylon interface and to ground wire connections 9951DC, 9956DC, and 9957DC on Engine Fan Case AMM 71-51-43-000-001 and AMM 71-51-43-400-001 for looseness or contamination ASM 793601.
   (3) If the IDG oil outlet temperature is also too high and/or the IDG OIL OVHT warning has been triggered:
  • do the related trouble shooting procedure.
   (4) If no IDG related fault is present and if the IDG oil outlet temperature is normal:
     (a) Get a sample of oil from the engine oil tank. If you can smell fuel presence in the engine oil:
     (b) Do a check of the EMCD and screens for particles AMM 79-00-00-281-002:
  • if no fault is found:
       1 do a functional test of the fuel return valve AMM 73-11-50-360-002:
  • if the fuel return valve operates as expected:
    . no maintenance action is required,
  • if the fuel return valve does not operate during the test:
    . replace the valve AMM 73-11-50-000-002 and AMM 73-11-50-400-002.
       2 if no fault is found:
       3 if the fault continues:
       4 if the fault continues:
       5 if the fault continues:
  • do an oil analysis to make sure the engine oil tank was not serviced with a non approved product.
   (5) Do an operational test of the FADEC with engine motoring AMM 73-29-00-710-040.
     (a) If the fuel return valve operates as expected, no maintenance action is required.
     (b) If the fuel return valve does not operate during the test, replace the valve AMM 73-11-50-000-002 AMM 73-11-50-400-002.
Subtask 79-00-00-710-109-A ** ON A/C NOT FOR ALL
B. Do a minimum idle check AMM 71-00-00-710-006.
   (1) No additionnal maintenance action is required if the fault is not confirmed.
   (2) Repeat the fault isolation procedure if the fault continues.
[Rev.8 from Aug 2018] 2026.04.04 04:38:22 UTC
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