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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)  
Attach the air source to the strut drain line exit on the drain mast.

 (c)  
Blow air back up the drain line.

 (d)  
Ensure that there is a clear flow of air through each of the three engine mounted strut drain lines.

 (e)  
Remove the plugs, rag, and unwanted material from the drain inlets.

 (f)  
Remove the air source.

 S 216-018-N00
 (7)  Visually examine the ends of the drain hoses and fittings for heavy deposits.
 NOTE: It is usual for the ends of the drain hoses and fittings
____ to change color. This is not residue and is acceptable.
 (a)  
Examine the strut mounted drain fittings.

 (b)  
Examine the ends of the drain hoses.

 S 436-019-N00
 (8)  
If you do not find a heavy deposit, install the drain hoses (no more action is necessary).

 S 166-020-N00

 (9)  
If you find a heavy deposit, replace the hose.

 NOTE: You may use normal airline procedures to clean the removed
____ hoses and fittings. These cleaned hoses and fittings may be reinstalled or put away for future use.
 S 216-021-N00
 (10)
 If the hose or fitting is fully blocked, examine the raceway for collected fluid.

 S 216-022-N00

 (11)
 Continue the visual inspection for heavy deposits in each of the next downstream tubes and fittings until you do not find heavy deposits.

 (a)  Replace the tubes which have heavy deposits.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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S 436-026-N00
 (12)
 Connect all disconnected drain hoses. S 416-023-N00

 (13)
 Close the thrust reversers (AMM 78-31-00/201).

 S 416-024-N00

 (14)
 Close the core cowl panels (AMM 71-11-06/201).

 S 416-025-N00

 (15)
 Close the fan cowl panels (AMM 71-11-04/201).

 S 446-028-N00

 (16)
 Do the activation procedure for the thrust reverser (AMM 78-31-00/201).

 WARNING:_______ OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
 REVERSERS.  IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.

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