S 028-038

 (2)  
Remove the damaged part of the velcro strip retainer.

 S 118-039

 (3)
Clean the mating surface (AMM 51-51-00/801).

 S 348-040

 (4)
Bond the new velcro tape (AMM 51-51-00/801).

 TASK 57-52-01-848-047
 7.  Put the Airplane Back to its Usual Condition____________________________________________
 A. Procedure
 S 428-049
 (1)  
If the foreflap was removed, install the foreflap (AMM 27-51-02/401).

 (2)  
Retract the flaps (AMM 27-51-00/201).

 S 868-048
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LEADING EDGE KRUEGER FLAPS - DESCRIPTION AND OPERATION
______________________________________________________
 1.  General (Fig. 1)_______
 A.  The leading edge Krueger flaps are auxiliary control surfaces which, in conjunction with the other leading and trailing edge flaps, provide additional lift during takeoff and landing by changing the wing camber and area. The flaps are housed in the lower inboard portion of the wing leading edge, and consist of three sections or segments which operate as a group. The three segments are of similar configuration except that the outboard segment has a cutout to clear the inboard nacelle structure. They are located between inboard leading edge stations 330.00 and 630.46.
 B.  Pneumatically driven units operate the flaps through a torque tube drive and transmission system. The flaps are controlled by position switches installed on the trailing edge flaps. The flaps are hinged at the forward end and incorporate a folding nose section which extends to increase effective area.
 2.  Krueger Flap Structure______________________
 A.  The structure of the Krueger flaps consists of a front spar, rear spar, inspar ribs and a folding fairing or nose assembly.
 (1)  
The front spar and ribs are made of sheet aluminum formed into C-section members.

 (2)  
The rear spar is machined from extruded aluminum.

 (3)  
The folding nose assembly is made up of sheet aluminum ribs with sheet aluminum skin.

 B.  The skin of the Krueger flaps is made of fiberglass and attached to the spars with hi-locks.
 C.  The hinge fittings are made of machined aluminum forgings and are bolted to the skin panel and spars.
 D.  For a description of the operation of the Krueger flaps, refer to 27-81-00/001.
 E.  Aerodynamic seals on the flap segments eliminate gaps when the flaps are in the retracted position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 1 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

DRIVE UNIT 
SEE A 
HINGE 
(2 PLACES) 
KRUEGER 
FLAP 
ROTARY 
ACTUATOR 
(2 PLACES) 
FOLDING 
NOSE 
NOSE HINGE 
(3 PLACES)  ACTUATING 
LINKAGE 
A 
Krueger Flap 
Figure 1 

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 ALL  ú ú 01 Page 2 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LEADING EDGE VARIABLE CAMBER FLAPS - DESCRIPTION AND OPERATION
______________________________________________________________
 1.  General (Fig. 1)_______
 A.  The variable camber flaps are auxiliary control surfaces installed in the lower portion of the wing leading edge to increase the aerodynamic lift of the wing by changing the wing camber. Incorporation of a flexible surface for the flaps provides a contour which improves the wing lift efficiency.
　
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