(k)  
Supply systems 1 and 4 hydraulic power (Ref 29-11-00/201).

 (l)  
Put the flap control lever in the 5-unit position to retract the flaps.

 (m)  
Remove the system 1 and 4 hydraulic power (Ref 29-11-00/201).

 S 715-023
 (4)  
Do a test of the flap retraction sequence:

 (a)  
Make sure the flaps are in the 5-unit position.

 (b)  
Push the ALTN FLAPS ARM switch to arm the alternate control system.

 (c)  
Turn the ALTN FLAPS EXT/RET switch to the RET position to retract the flaps. 1) Make sure the TE flaps are fully retracted before the LE

 flaps start to retract.

 (d)  
Turn the ALTN FLAPS EXT/RET switch to the OFF position.

 (e)  
Put the flap control lever in the UP detent.

 (f)  
Push the ALTN FLAPS ARM switch to disarm the alternate control system.

 F.
Put the Airplane Back to Its Usual Condition

 (1)  
Remove electrical power (Ref 24-22-00/201).

 S 865-020
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLAP HYDRAULIC DRIVE MOTOR - REMOVAL/INSTALLATION
_________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of the flap hydraulic drive motor. The procedure has these parts:
 (1)  
The removal of the hydraulic lines

 (2)  
The removal of the drive motor

 (3)  
The installation of the drive motor

 (4)  
The installation of the hydraulic lines.

 B.  
To replace the flap hydraulic drive motor it is not necessary to remove the flap drive power package.

 TASK 27-51-16-224-016
 2.  Flap Hydraulic Drive Motor Removal (Fig. 401)__________________________________
 A.  References
 (1)  
29-11-00/201, Main Hydraulic Supply System

 (2)  
32-00-30/201, Manual Control

 (3)  
IPC 27-51-35, Fig. 1

 B.  
Access

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

 C.  
Prepare for the Removal

 S 494-001
 (1) Make sure that the landing gear ground locks are installed.
 S 494-002
 WARNING: CAREFULLY DO THE SPECIFIED TASK TO INSTALL THE DOOR LOCKS ON
_______ THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Install the door locks on the doors for the body landing gear (Ref 32-00-30/201).

 D.  
Remove the Drive Motor

 S 864-003
 (1)  Release the pressure in hydraulic systems No. 1 and 4 (Ref 29-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

INBOARD FLAP POWER PACKAGE SEE B SEE A
OUTBOARD FLAP 3. HYDRAULIC
POWER PACKAGE LINES
2. CASE DRAIN
1. REDUCER
14. O-RING
13. BOLT
11. WASHER
(3 LOCATIONS)

4.
ADAPTER

5.
NUT

6.
O-RING

7.
BACKUP RING

8.
O-RING

9.
HYDRAULIC DRIVE MOTOR

10.
BOLT

11.
WASHER

12.
NUT (3 LOCATIONS)

INBOARD FLAP
HYDRAULIC MOTOR

A

Flap Hydraulic Motor Installation
Figure 401 (Sheet 1)

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