B.  The Thrust Reverser Return Filter is referred to as the Return Filter for this procedure.
 C.  The Return Filter filters the hydraulic fluid prior to the hydraulic
 fluid entering the airplane system from the thrust reverser.

 D.  The filter has a check valve and a reverse flow valve. The check valve
 prevents reverser flow of hydraulic fluid through the filter. The
 reverse flow valve balances the hydraulic fluid pressure.

 TASK 78-34-14-004-003-N00
 2.  Remove the Return Filter
________________________
 A.  References
 (1)  
AMM 27-62-00/201, Speed Brake Control System

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 36-00-00/201, Pneumatic System

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Doors

 (5)  
AMM 78-31-00/201, Thrust Reverser System

 (6)  
IPC 78-31-55, Fig. 1

 B.  
Access

 (1)  
Location Zones
 454 System 1 - Strut Aft Fairing
 464 System 2 - Strut Aft Fairing
 474 System 3 - Strut Aft Fairing
 484 System 4 - Strut Aft Fairing

 (2)  
Access panels
 454AL Trailing Edge Fairing Doors - System 1
 464AL Trailing Edge Fairing Doors - System 2
 474AL Trailing Edge Fairing Doors - System 3
 484AL Trailing Edge Fairing Doors - System 4

 C.  
Prepare to Remove the Return Filter

 S 044-002-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE SPOILER/SPEEDBRAKE
_______ CONTROL SYSTEM. IF YOU DO NOT DO THIS, THE SPOILERS CAN MOVE QUICKLY WHEN YOU MOVE THE THRUST LEVERS. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the spoiler/speedbrake control system (AMM 27-62-00/201).

 S 864-010-N00

 (2)  
Make sure the forward thrust levers are in the idle position and attach the DO-NOT-OPERATE tags.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-34-14
 ALL  ú ú N01 Page 401 ú Feb 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 864-004-N00
 (3)  Make sure the reverse thrust levers are in the fully stowed position and attach the DO-NOT-OPERATE tags.
 S 044-005-N00
 WARNING: DO THE 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.
 (4)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 D.
Remove the Return Filter (Fig. 401).

 S 014-023-N00
 (1)  Open the fairing doors on the trailing edge of the applicable strut (AMM 54-62-00/201).
 S 864-024-N00
 WARNING: MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 S 864-025-N00
 WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
 (3)  Release the pressure in the main hydraulic system and reservoir for the applicable strut (AMM 29-11-00/201).
 S 024-007-N00
 CAUTION: BE PREPARED TO CATCH THE HYDRAULIC FLUID IN THE APPLICABLE
_______ CONTAINER WHEN YOU REMOVE THE RETURN FILTER. IF THE HYDRAULIC FLUID FALLS ON THE ENGINE, QUICKLY CLEAN THE ENGINE. IF YOU DO NOT QUICKLY CLEAN THE HYDRAULIC FLUID, THE HYDRAULIC FLUID CAN CAUSE DAMAGE TO THE ENGINE.
 (4)  Cut and remove the lockwire from the filter bowl.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 78-34-14
 ALL  ú ú N01 Page 402 ú Oct 10/95
　
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