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A
747-400 MAINTENANCE MANUAL
 WINGLET - REMOVAL/INSTALLATION
______________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task is the removal of the winglet. The second task is the installation of the winglet.
 B.  To remove and install the winglet you must use the winglet sling. The mid fairings between the wingtip and the winglet are attached to the winglet and to the wingtip. You must remove the mid fairings first before you remove the winglet. The procedure to remove the mid fairings is included in this section. The forward and aft fairings can stay attached to the wingtip during the removal or installation of the winglet.
 C.  The winglet is attached to the wingtip with two fittings attached with bolts, one smaller forward fitting and one larger aft fitting. You can get access to the bolts after you remove the outboard section of the mid fairing. You must remove the two ground straps attached to the winglet before you remove the winglet. You must measure the bonding resistance between the winglet and the wingtip during the installation of the winglet.
 TASK 57-28-01-004-001
 2.  Winglet Removal (Fig. 401)__________________________
 A.  Special Tools and Equipment
 (1)  
G57002-24 - Winglet Sling

 (2)  
G57004-7 - Installation/Removal Tool - Winglet Aft Mount Bolts

 B.  Standard Tools and Equipment
 (1)  
Positioner - Load (For 140 Pounds), LL-5-3, Permadur Industries, INC. 47 old camplain road, Somerville New Jersey, 08876 USA. (alternative)

 (2)  
Hoist - Suitable for reaching above the winglet with provisions for attaching the winglet sling

 C.  References
 (1)  IPC 57-28-01 Fig. 1
 D.  Access
 (1)  Location Zone
 539 Winglet, Left
 639 Winglet, Right

 E.  Procedure
 S 014-002
 (1)  Remove the mid fairing.
 NOTE:____There are three divided sections to the mid fairing. A forward, or leading edge section, an aft inboard section and an aft outboard section. You must remove all three of these sections before you remove the winglet.
 (a)  Remove the screws from the perimeter of the forward section of the mid fairing.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

WING EXTENSION

Winglet Installation
Figure 401 (Sheet 1)

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 57-28-01
 ALL  ú ú 01 Page 402 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Winglet Installation
Figure 401 (Sheet 2)

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 57-28-01
 ALL  ú ú 01 Page 403 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  
Remove the forward section.

 (c)  
Remove the screws from the forward edge at the aft inboard section and the aft outboard section.

 (d)  
Remove the splice channels from the fairing.

 (e)  
Remove the screws from the edges of the aft inboard section of the mid fairing.

 (f)  
Remove the aft inboard section.

 (g)  
Hold the aft outboard section of the mid fairing while you remove the screws from the edges of the section.

 (h)  
Remove the aft outboard section.

 S 494-003
 (2)  Attach the sling to the winglet.
 (a)  Use the recommended hoist and load positioner to lift the winglet.
 NOTE: The load positioner tool is not needed if the hoist
　
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