(7)
AMM 78-31-00/201, Thrust Reverser System

 (8)
AMM 79-21-05/401, Main Oil Filter Element

 (9)
AMM 79-21-10/401, Magnetic Chip Detectors

 (10)
 AMM 79-21-10/601, Magnetic Chip Detectors

 (11)
 AMM 79-21-16/401, Last Chance Oil Strainers

 (12)
 AMM 79-21-16/601, Last Chance Oil Strainers

 (13)
 AMM 79-21-16/701, Last Chance Oil Strainers

 D.  
Access

 (1)  
Location Zone
 412 Engine 1 - Engine
 422 Engine 2 - Engine
 432 Engine 3 - Engine
 442 Engine 4 - Engine

 (2)  
Access Panel
 415 and 416 Thrust Reverser Halves - Engine 1
 425 and 426 Thrust Reverser Halves - Engine 2
 435 and 436 Thrust Reverser Halves - Engine 3
 445 and 446 Thrust Reverser Halves - Engine 4

 E.  
Prepare for the Oil System Contamination Inspection

 (1)
Open the fan cowl panels (AMM 71-11-04/201).

 S 016-097-N00
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 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
 OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
 THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 (2)  
Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (AMM 78-31-00/201).

 S 016-099-N00

 (3)  
Open the core cowl panels (AMM 71-11-06/201).

 S 016-100-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU OPEN THE
_______
 THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS,
 INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (4)  
Open the thrust reversers (AMM 78-31-00/201).

 F.  
Examine the Oil for Contamination from Solids (Build Debris, Pieces from a Repair, Bearing, or Gear).

 S 286-216-N00
 (1)  Examine for contamination:
 NOTE: You must adjust the frequency of filter checks and
____ replacements. This will keep to a minimum the number of incidents where the delta-P warning light for the main oil filter comes on.
 (a)  Remove the main oil filter (AMM 79-21-05/401) and the magnetic chip detectors (AMM 79-21-10/401).
 CAUTION: IF YOU FIND METAL PARTICLES, YOU MUST FIND THE SOURCE OF
_______ THE PARTICLES AND CORRECT THE CONDITION BEFORE SUBSEQUENT FLIGHTS. MORE DAMAGE CAN POSSIBLY OCCUR IF THE ENGINE IS OPERATED WITH A PROBLEM THAT IS NOT CORRECTED.
 (b)  
Flush the main oil filter with solvent.

 (c)  
Put the solvent through filter paper or a clean cloth to examine the particles from the oil filter. 1) Keep the contamination.

 (d)  
Install a new main oil filter (AMM 79-21-05/401).

 (e)  
Remove all the last chance oil strainers (AMM 79-21-16/401).

 (f)  
Examine the last chance oil strainers for contamination (AMM 79-21-16/601). 1) Keep the contamination that you find.

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 8 - Oil System Contamination Inspection
___________________________________________
 (g)  
Clean the last chance oil strainers if you find contamination (AMM 79-21-16/701).

 (h)  
Install the last chance oil strainers.

 (i)  
Put the solvent through filter paper or a clean cloth to collect the contamination.

 (j)  
Examine the magnetic chip detectors (AMM 79-21-10/601).