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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLAP POWER PACKAGE - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  There are two trailing edge (TE) flap power packages on the airplane. They are almost the same but are not interchangeable. The inboard flap power package is installed on the forward bulkhead of the left body gear wheel well. The outboard flap power package is installed on the forward bulkhead of the right body gear wheel well. Each of the flap power package has a control valve, hydraulic motor, gearbox, control module and an alternate electric motor.
 B.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of the flap power package. The procedure has these parts:
 (1)  
The installation of the support equipment

 (2)  
The removal of the electrical connectors

 (3)  
The removal of the flap power package

 (4)  
The installation of the flap power package

 (5)  
The removal of the support equipment

 (6)  
The installation of the electrical connectors

 (7)  
The test of the flap power package.

 TASK 27-51-09-004-001
 2.  Flap Power Package Removal__________________________
 A.  Special Tools and Equipment
 (1)  
PF51-009-1, Fishpole Hoist, pneumatic powered, (2 are necessary) (preferred).

 (2)  
PF51-003-1, Fishpole Hoist, pneumatic powered (preferred).

 (3)  
OHME65B81110-1, Inboard TE Flap Power Unit Hoisting Adapter

 (4)  
OHME65B81111-3, Outboard TE Flap Power Unit Hoisting Adapter

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 27-51-09/501, Flap Power Package

 (3)  
AMM 27-51-18/401, Limit Switch Pack

 (4)  
AMM 27-58-01/401, Flap Position Transmitter

 (5)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (6)  
AMM 32-00-30/201, Landing Gear Door Locks

 (7)  
AIPC 27-51-09, Fig. 1

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 27-51-09
 ALL  ú ú 02 Page 401 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (8)  
AIPC 27-51-09, Fig. 3

 (9)  
AIPC 27-51-08, Fig. 1

 C.
Access

 (1)  
Location Zone
 137 Body Landing Gear Well, LH
 138 Body Landing Gear Well, RH

 D.
Prepare for the Flap Power Package Removal

 S 864-002
 (1)  Pressurize hydraulic systems No. 1 and 4 (AMM 29-11-00/201).
 S 864-042
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (2)  Put the flap control lever in the UP detent to retract the TE flaps.
 NOTE: It will be easier to adjust a new power package if the flaps
____
 are retracted.

 S 864-004
 (3)  
Release the pressure in hydraulic systems No. 1 and 4
 (AMM 29-11-00/201).

 S 864-005

 (4)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P6, Main Power Distribution Panel
 1) 6L10, FUEL CONT VALVE ENG 1
 2) 6L11, FUEL CONT VALVE ENG 2
 3) 6L12, FUEL CONT VALVE ENG 3
 4) 6L13, FUEL CONT VALVE ENG 4
 5) 6E3, PRIM LE FLAP CONT A-AC
 6) 6E4, PRIM LE FLAP CONT A-DC
 7) 6E5, PRIM LE FLAP CONT B-AC
 8) 6E6, PRIM LE FLAP CONT B-DC
 9) 6L20, TE FLAP ELEC CONT INBD
 10) 6L19, TE FLAP ELEC CONT OTBD

 (b)  
P7, Overhead Circuit Breaker Panel
 1) 7A3, AURAL WARN L
 2) 7A4, AURAL WARN R
 3) 7C18, LWR YAW DAMPER
 4) 7C9, UPR YAW DAMPER
 5) 7D13, FLT CONT CMPTR SERVO L
 6) 7D8, FLT CONT CMPTR PWR L
　
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