R 1_ Do a check for external oil leak and oil dripping from the
R drain mast (Ref. AMM TASK 71-00-00-790-002).

R 2_ Do a check for heavy oil discharge from the center vent tube
R through the flame arrestor into the center body.

R a_ If an excessive oil discharge from the center vent is
R confirmed and the oil consumption is also excessive:
R - do the trouble shooting as per TSM entry: ATA79 HIGH OIL
R CONSUMPTION.

R 3_ Do a check of the lubrication unit magnetic plugs and screens
R (Ref. AMM TASK 79-00-00-281-002).

R a_ If nothing is found:
R - remove the AGB drain plug,
R - do a check for abnormal oil quantity.

R b_ If there is more than one quart of oil in the AGB:
R - do a check for oil scavenge line blockage.

R c_ If the AGB oil scavenge line is found blocked:
R - clean or repair as required.

R d_ If the AGB oil scavenge line is not found blocked:
R - do a check for obstruction of the aft sump flame arrestor
R (Ref. AMM TASK 72-56-00-210-002).

R e_ If obstruction of the grid is greater than 50%:
R - replace the flame arrestor (Ref. AMM TASK 72-56-00-000-R 001) and (Ref. AMM TASK 72-56-00-400-001).

R f_ If nothing is found on flame arrestor:
R - check the oil tank strainer for blockage.

R g_ If the strainer is blocked:
R - replace the oil tank (Ref. AMM TASK 79-11-10-000-005) and
R (Ref. AMM TASK 79-11-10-400-005).

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R  h_  If nothing is found in the strainer:
R  - replace the lubrication unit (Ref. AMM TASK 79-21-10-000-
R  004) and (Ref. AMM TASK 79-21-10-400-004). 
R  (2) If actual low oil pressure is not confirmed (indicating system 
R  failure): 
R  - replace the SW-LOW OIL PRESS (4000EN) (Ref. AMM TASK 79-34-15-000-
R  041) and (Ref. AMM TASK 79-34-15-400-041). 
R  - do a check of the wiring between the low oil pressure switch 
R  (4000EN) and the EIU-1 (1KS1) pin AA/7A (Ref. ASM 79-36/01) for 
R  short to ground, 
R  - repair, clean or replace wiring or connectors as required. 
R  (a) If the fault continues: 
R  - replace the EIU-1 (1KS1) (Ref. AMM TASK 73-25-34-000-040) and 
R  (Ref. AMM TASK 73-25-34-400-040). 
R 
R  B. Do a minimum idle check (Ref. AMM TASK 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.

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 TASK 79-00-00-810-837
 Low Oil Pressure Indication on Engine 2
 1. Possible Causes
_______________
 - SW-LOW OIL PRESS (4000EN)

 - engine
 - oil tank

 - lubrication unit

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 71-00-00-710-006 Minimum Idle Check R AMM 71-00-00-790-002 Fuel or Hydraulic or Oil Leakage 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 72-56-00-210-002 Inspection/Check of the Turbine Frame Assembly AMM 72-56-00-400-001 Installation of the Flame Arrestor and 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)

R R AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for
 Particles
 AMM 79-11-10-000-005 Removal of the Oil Tank
 AMM 79-11-10-400-005 Installation of the Oil Tank
 AMM 79-21-10-000-004 Removal of the Lubrication Unit
 AMM 79-21-10-400-004 Installation of the Lubrication Unit

R AMM 79-34-15-000-041 Removal of the Low Oil Pressure Switch (4000EN) AMM 79-34-15-400-041 Installation of the Low Oil Pressure Switch (4000EN) ASM 79-36/01
　
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