- do a check of the lube supply and common scavenge filters clogging indicators (Ref. AMM TASK 79-00-00-281-003).

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ER (2) Remove and replace the main oil supply filter (Ref. AMM TASK 79-21-R 10-920-002).

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 (3) If the fault continues:

 - replace the SW-OIL FILTER DIFF PRESS (4001EN) (Ref. AMM TASK 79-35-15-000-003) and (Ref. AMM TASK 79-35-15-400-003).

 (4) If the fault continues:

 (a) Do a check of the aircraft wiring between the oil filter differential pressure switch (4001EN) and SDAC1/SDAC2 for short to ground:
 - repair or replace the wiring as required.
 B. Do a minimum idle leak 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 79-00-00-810-823
 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 71-00-00-000-042 Removal of the Power Plant AMM 71-00-00-400-042 Installation of the Power Plant AMM 72-56-00-000-001 Removal of the Flame Arrestor and Flange Assembly AMM 72-56-00-400-001 Installation of the Flame Arrestor and Flange
 Assembly AMM 79-00-00-210-002 Walk-around Inspection AMM 79-00-00-210-003 Visual Inspection of the Oil System AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for
 Particles AMM 79-00-00-281-003 Check of FWD, AFT Sump, AGB, and TGB scavenge screens AMM 79-21-10-000-004 Removal of the Lubrication Unit AMM 79-21-10-400-004 Installation of the Lubrication Unit AMM 79-33-15-000-041 Removal of the Oil Pressure Transmitter (4003EN) AMM 79-33-15-400-041 Installation of the Oil Pressure Transmitter (4003EN) 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
__________________
 A. Test
 (1) Not applicable.
 4. Fault Isolation
_______________
 A. If the fault symptom is identified by the crew observation OIL pressure higher or lower than on the other engine:
R NOTE : Refer to CFM SB 79-021 covering HTS Oil coking issues. Trend
____ R instructions to monitor oil pressure trend and implement R Inspection and Cleaning procedures if necessary.
 - do a check of the electric master magnetic chip detector visual indicator (Ref. AMM TASK 79-35-00-040-042) and the magnetic chip
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E detector (Ref. AMM TASK 79-00-00-281-002) and the scavenge screen plugs (Ref. AMM TASK 79-00-00-281-003).

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 (1) If you find magnetic particles:

 - follow the related instructions per (Ref. AMM TASK 79-00-00-281-002) and NDT Manual (section CHIP ANALYSIS).

 (2) If nothing is found:

 - do a visual check for external leaks (Ref. AMM TASK 79-00-00-210-002).
 (a) If there is sign of heavy oil discharge in the center vent tube:

 - replace the engine (Ref. AMM TASK 71-00-00-000-042) and (Ref. AMM TASK 71-00-00-400-042).

 (b) If nothing is found:

 - do a check of the flame arrestor for clogging:
 1_ If confirmed:
 - clean or replace as required (Ref. AMM TASK 72-56-00-000-
001) and (Ref. AMM TASK 72-56-00-400-001).

 2 If nothing is found:
_
 - do a check for the oil scavenge line for blockage (Ref. AMM TASK 79-00-00-210-003).
 a If nothing if found:
_
 - replace the XMTR-OIL PRESS (4003EN) (Ref. AMM TASK 79-33-15-000-041) and (Ref. AMM TASK 79-33-15-400-041).
　
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