Low Oil Pressure Indication on Engine 2

TASK 79-00-00-810-837-A
Low Oil Pressure Indication on Engine 2

1. Possible Causes

engine
oil tank
lubrication unit
SW-LOW OIL PRESS [4000EN]
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 71-00-00-710-006	Minimum Idle Check
AMM 71-00-00-790-002	Fuel or Hydraulic or Oil Leakage Limits
AMM 72-00-00-200-003	Procedure After the Engine has Exceeded the Operational Limits
AMM 72-00-00-200-008	Inspection/Check After the Engine has Exceeded the Operational Limits
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 72-56-00-210-001	Inspection/Check of the Turbine Frame Assembly
AMM 72-56-00-210-002	Inspection/Check of the Turbine Frame 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 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 79-00-00-281-002	Check of the Electrical Master Chip Detector (EMCD) for Particles
AMM 79-11-10-000-001	Removal of the Oil Tank
AMM 79-11-10-000-005	Removal of the Oil Tank
AMM 79-11-10-400-001	Installation of the Oil Tank
AMM 79-11-10-400-005	Installation of the Oil Tank
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 79-34-15-000-040	Removal of the Low Oil Pressure Switch
AMM 79-34-15-000-041	Removal of the Low Oil Pressure Switch
AMM 79-34-15-400-040	Installation of the Low Oil Pressure Switch
AMM 79-34-15-400-041	Installation of the Low Oil Pressure Switch
ASM 793601

3. Fault Confirmation
Subtask 79-00-00-710-116-A ** ON A/C NOT FOR ALL

A. Not Applicable

Subtask 79-00-00-710-116-B ** ON A/C NOT FOR ALL

A. Not Applicable

4. Fault Isolation
Subtask 79-00-00-810-100-A ** ON A/C NOT FOR ALL

A. The ECAM warning is triggered if the low oil pressure switch output indicates an oil pressure lower than 13 PSI while the engine speed is above idle.
(1) If actual low oil pressure is confirmed by the crew report (oil pressure indication flashing green on lower ECAM):

do an inspection AMM 72-00-00-200-003 after the engine has exceeded the operational limits.

(a) If the engine is still operable:

do the following checks:

1 Do a check for external oil leak and oil dripping from the drain mast AMM 71-00-00-790-002.
2 Do a check for heavy oil discharge from the center vent tube through the flame arrestor into the center body.
a If an excessive oil discharge from the center vent is confirmed and the oil consumption is also excessive:

do the trouble shooting as per TSM entry: ATA79 HIGH OIL CONSUMPTION.

3 Do a check of the lubrication unit magnetic plugs and screens AMM 79-21-10-210-002.
a If nothing is found:

remove the AGB drain plug,
do a check for abnormal oil quantity.

b If there is more than one quart of oil in the AGB:

do a check for oil scavenge line blockage.

c If the AGB oil scavenge line is found blocked:

clean or repair as required.

d If the AGB oil scavenge line is not found blocked:

do a check for obstruction of the aft sump flame arrestor AMM 72-56-00-210-001.

e If obstruction of the grid is greater than 50%:

replace the flame arrestor AMM 72-56-00-000-003 and AMM 72-56-00-400-003.

f If nothing is found on flame arrestor:

check the oil tank strainer for blockage.

g If the strainer is blocked:

replace the oil tank AMM 79-11-10-000-001 and AMM 79-11-10-400-001.

h If nothing is found in the strainer:

replace the lubrication unit AMM 79-21-10-000-001 and AMM 79-21-10-400-001.

(2) If actual low oil pressure is not confirmed (indicating system failure):

replace the SW-LOW OIL PRESS [4000EN] AMM 79-34-15-000-040 and AMM 79-34-15-400-040.
do a check of the wiring between the low oil pressure switch (4000EN) and the EIU-2 (1KS2) pin AA/7A ASM 793601 for short to ground,
repair, clean or replace wiring or connectors as required.

(a) If the fault continues:

replace the EIU-2 (1KS2) AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 79-00-00-710-117-A ** ON A/C NOT FOR ALL

B. Do a minimun idle check AMM 71-00-00-710-006.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.

Subtask 79-00-00-810-100-B ** ON A/C NOT FOR ALL

C. The ECAM warning is triggered if the low oil pressure switch output indicates an oil pressure lower than 13 PSI while the engine speed is above idle.
(1) If actual low oil pressure is confirmed by the crew report (oil pressure indication flashing green on lower ECAM):

do an inspection AMM 72-00-00-200-008 after the engine has exceeded the operational limits.