NOTE: MEASUREMENT ARE TAKEN WITH AIRPLANECLEARANCE LENGHT OF 60 INCHES MAXIMUM.
ON LANDING GEARS AND WITHOUT FUEL.
Krueger Flaps Gap and Mismatch Requirements
Figure 402 (Sheet 1)

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A40317
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MAINTENANCE MANUAL

WING LEADING

0.04 INCH
KRUEGER  KRUEGER
MAXIMUM

NEGATIVE CONTOUR
POSITIVE CONTOUR
AT FLAP LINKAGE
AT FLAP LINKAGES
C
C
Krueger Flaps Gap and Mismatch Requirements
Figure 402 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

1.00 INCH
0.32 INCH
SEAL PERMITTED OVERLAP
0.25 INCH

Krueger Flap Clearance and Mismatch Requirements
Figure 402 (Sheet 3)

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747-400 MAINTENANCE MANUAL
 (6)  
SRM 51-40-09, Glass Fabric Reinforced Epoxy Laminates and
 Nonmetallic Honeycomb Sandwich Repairs

 (7)  
SSM 27-81-01, SSM 27-81-02, SSM 27-81-03, SSM 27-81-04,
 SSM 27-81-05, SSM 27-81-06

 (8)  
WDM 27-51-21, WDM 27-51-22, WDM 27-81-11, WDM 27-81-12,
 WDM 27-81-21, WDM 27-81-22, WDM 27-81-31, WDM 27-81-32,
 WDM 27-81-41, WDM 27-81-42, WDM 27-81-81, WDM 27-81-82

 D.
Access

 (1)  
Location Zone
 512 Krueger Flap Inboard, LH
 513 Krueger Flap Midflap, LH
 514 Krueger Flap Outboard, LH
 612 Krueger Flap Inboard, RH
 613 Krueger Flap Midflap, RH
 614 Krueger Flap Outboard, RH

 E.
Install the Krueger Flap

 NOTE: If you want to make a new (No. 11 or No. 16) flap or folding
____ fairing you can use the old one(s) that you removed as a guide to get the new one(s) close to the required size and interference clearances (SB 57-2268).
 S 224-010
 (1)  
Do this task if you install used bolts or bushings: "Krueger Flaps Inspection/Check" (AMM 27-81-01/601).

 S 434-011

 (2)  
If you removed the folding fairing (27), install the folding fairing (27):

 (a)  
Set the folding fairing (27) in its position.

 (b)  
Attach the folding fairing to the krueger flap (1) with the bolts (21), washers (23 and nuts (22).

 (c)  
On Krueger flaps No. 11 and 16, tighten all the bolts but the center attachment point (between the krueger flap and the folding fairing) to 95-110 pound-inches.

 (d)  
Attach each link assembly (29) to the folding fairing (27) with the bolts (24), washers (25), bushings (28) and nuts (26).

 (e)  
Connect the bonding jumpers (3) between the flap (1) and the folding fairing (27).

 S 424-012
 (3)  
Install the Krueger flap (Fig. 401):

 (a)  
Install the bushings (18) in the structural hinge fittings (Section A-A, Fig. 401).

 (b)  
Align the flap hinges with the hinge fittings.

 (c)  
Install the bolts (19), washers (20) and nuts (17).

 (d)  
Tighten the nuts to 1300-1500 pound-inches.

 (e)  
Align the actuator links (9) with the rotary actuators (5).

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