W DOC AIRBUS | TSM A320F

Oil Pressure Difference between Engine 1 and Engine 2

TASK 79-00-00-810-823-A
Oil Pressure Difference between Engine 1 and Engine 2

1. Possible Causes
  • engine
  • XMTR-OIL PRESS [4003EN]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 31-55-34-000-001
Removal of the SDAC
AMM 31-55-34-400-001
Installation of the SDAC
AMM 71-00-00-000-040
Removal of the Power Plant
AMM 71-00-00-000-042
Removal of the Power Plant
AMM 71-00-00-400-040
Installation of the Power Plant
AMM 71-00-00-400-042
Installation of the Power Plant
AMM 71-00-00-820-001
Oil Circuit Air Flow Check
AMM 71-00-00-820-002
Oil Circuit Air Flow Check
AMM 72-56-00-000-001
Removal of the Flame Arrestor and Flange Assembly
AMM 72-56-00-000-003
Removal of the Flame Arrestor and of the Flange Assembly
AMM 72-56-00-400-001
Installation of the Flame Arrestor and Flange Assembly
AMM 72-56-00-400-003
Installation of the Flame Arrestor and of the Flange Assembly
AMM 79-00-00-210-002
Walk-around Inspection
AMM 79-00-00-210-003
Visual Inspection of the Oil System
AMM 79-00-00-210-004
Walk-around Inspection
AMM 79-00-00-210-005
Visual Inspection of the Oil System
AMM 79-00-00-281-002
Check of the Electrical Master Chip Detector (EMCD) for Particles
AMM 79-00-00-281-003
Check of FWD Sump, AFT Sump, AGB, and TGB Scavenge Screens
AMM 79-21-10-000-001
Removal of the Lubrication Unit
AMM 79-21-10-000-004
Removal of the Lubrication Unit
AMM 79-21-10-210-002
Check of the Lubrication Unit Magnetic Plugs and Scavenge Screens
AMM 79-21-10-400-001
Installation of the Lubrication Unit
AMM 79-21-10-400-004
Installation of the Lubrication Unit
AMM 79-33-15-000-040
Removal of the Oil Pressure Transmitter
AMM 79-33-15-000-041
Removal of the Oil Pressure Transmitter
AMM 79-33-15-400-040
Installation of the Oil Pressure Transmitter
AMM 79-33-15-400-041
Installation of the Oil Pressure Transmitter
AMM 79-35-00-040-042
Replacement of the Main Oil Supply Filter and Check of the Electrical Chip Detector Visual Indicator (pop-out)
3. Fault Confirmation
Subtask 79-00-00-710-094-A ** ON A/C NOT FOR ALL
A. Test
   (1) Not applicable.
4. Fault Isolation
Subtask 79-00-00-810-081-A ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the crew observation OIL pressure higher or lower than on the other engine:
NOTE: Refer to CFM SB 79-0001 covering HTS Oil coking issues. Trend instructions to monitor oil pressure trend and implement Inspection and Cleaning procedures if necessary.
  • Do a check of the lubrication unit magnetic plugs and screens AMM 79-21-10-210-002 on suspected engine.
   (1) If you find magnetic particles:
   (2) If nothing is found:
     (a) If there is sign of heavy oil discharge in the center vent tube:
     (b) If nothing is found:
  • Do a check of the flame arrestor for clogging:
       1 If confirmed:
       2 If nothing is found:
         a If nothing if found:
  • Replace the XMTR-OIL PRESS [4003EN] AMM 79-33-15-000-040 and AMM 79-33-15-400-040.
    * If the fault continues
  • do a continuity check of the electrical wiring between the ENG1 OIL PRESS XTRM (4003EN) and the SDAC1 (1WV1), pin 15C/15D (ASM 79-36/01)
    ** If nothing is found
  • Do a continuity check of the electrical wiring between the ENG1 OIL PRESS XTRM (4003EN) and the SDAC2 (1WV2), pin 15C/15D (ASM 79-36/01)
    *** If nothing is found
  • Open circuit breaker 3WV
  • Visually check the oil pressure indication on the ECAM display
    **** If both engines oil pressure indications become approximately the same
  • Replace the SDAC1 AMM 31-55-34-000-001 and AMM 31-55-34-400-001
    **** If the fault continues
  • Open circuit breaker 2WV
  • Visually check the oil pressure indication on the ECAM display
    ***** If both engines oil pressure indications become approximately the same
  • Replace SDAC2 AMM 31-55-34-000-001 and AMM 31-55-34-400-001
    ***** If the fault continues:
  • Replace the engine lubrication unit AMM 79-21-10-000-001 and AMM 79-21-10-400-001.
Subtask 79-00-00-810-081-B ** ON A/C NOT FOR ALL
A. If the fault symptom is identified by the crew observation OIL pressure higher or lower than on the other engine:
NOTE: Refer to CFM SB 79-0001 covering HTS Oil coking issues. Trend instructions to monitor oil pressure trend and implement Inspection and Cleaning procedures if necessary.
   (1) If you find magnetic particles:
   (2) If nothing is found:
     (a) If there is sign of heavy oil discharge in the center vent tube:
     (b) If nothing is found:
  • Do a check of the flame arrestor for clogging:
       1 If confirmed:
       2 If nothing is found:
         a If nothing if found:
  • Replace the XMTR-OIL PRESS [4003EN] AMM 79-33-15-000-041 and AMM 79-33-15-400-041.
    * If the fault continues
  • Do a continuity check of the electrical wiring between the ENG1 OIL PRESS XTRM(4003EN) and the SDAC1 (1WV1), pin 15C/15D (ASM 79-36/01)
    ** If nothing is found
  • Do a continuity check of the electrical wiring between the ENG1 OIL PRESS XTRM(4003EN) and the SDAC2 (1WV2), pin 15C/15D (ASM 79-36/01)
    *** If nothing is found
  • Open circuit breaker 3WV
  • Visually check the oil pressure indication on the ECAM display
    **** If both engines oil pressure indications become approximately the same
  • Replace the SDAC1 AMM 31-55-34-000-001 and AMM 31-55-34-400-001
    **** If the fault continues
  • Open circuit breaker 2WV
  • Visually check the oil pressure indication on the ECAM display
    ***** If both engines oil pressure indications become approximately the same
  • Replace the SDAC2 AMM 31-55-34-000-001 and AMM 31-55-34-400-001
    ***** If the fault continues:
  • Replace the engine lubrication unit AMM 79-21-10-000-004 and AMM 79-21-10-400-004.
Subtask 79-00-00-710-095-A ** ON A/C NOT FOR ALL
B. No additional maintenance action is required if the fault is not confirmed.
   (1) Repeat the fault isolation procedure if the fault continues.
[Rev.8 from Aug 2018] 2026.04.04 04:38:22 UTC
"WTRUIB" 2025