%
%
Figure 8: Layers of Cloth in the Wing Top Shell - Stages 2 - 6
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13 15
17
Item No. Layers Reference No. Type Remarks
13, 15 1 each H 60 6 mm rigid foam
17 1 8.4551.60 glass twill 2/2 ±45o
Figure 9: Layers of Cloth in the Wing Top Shell - Stages 7 and 8
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Section 57-50
Flaps
1. General
This Section tells you about the flap structure. Refer to Section 27-50 for data about the flap control system.
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Flap Hinge Plastic Plug
Figure 1: Flap Structure and Assembly
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2. Description
Figure 1 shows the flap structure. Each flap has these components:
A. Bottom Shell
The bottom shell has inner and outer GFRP skins. It also has one layer of carbon fiber cloth in the outer skin. The skins bond to a rigid plastic foam core. The leading edge of the shell bends up to form a web. It then curves forward to form a shroud which seals the gap between flap and wing when the flap is down.
The outboard end of the bottom shell also bends up to close the end of the flap. The leading edge, the ends, and the area where the horn attaches have more carbon fiber cloth to give more strength and stiffness.
B. Top Shell
The top shell has inner and outer GFRP skins. It also has one layer of carbon cloth in the outer skin. The skins bond to a rigid plastic foam core. The top shell bonds to the bottom shell and the inner end rib.
C. Inner End Rib
The inner end rib is a CFRP molding. The rib has two holes with flanged bushes. The bushes engage with the transfer pins on the transfer levers of the flap control system. The end rib bonds to the top and bottom shells.
D. Flap Horn
The flap horn is an aluminum alloy component. Three bolts attach the horn to the bottom surface of the flap. A small hole in the leading edge of the flap gives access to the front attaching nuts and washers. The horn also makes one of the flap hinges. Two flanged bushes in the front of the horn make the hinge.
E. Flap Hinges
Each flap has five hinges (as well as the flap horn). Two bolts attach each hinge to the leading edge of the flap. A small hole in the middle of the hinge gives access to the attaching nuts and washers. Each hinge has a flanged bush at the inboard end. A plastic plug seals the outboard end.
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Maintenance Practices
1. General
These maintenance practices tell you how to remove and install the flaps. Refer to Section 27-50 for the flap setting procedure.
2. Remove/Install a Flap
A. Remove a Flap
Detail Steps/Work Items Key Items/References
WARNING: MAKE SURE THAT THE AREA AROUND THE FLAPS IS CLEAR OF PERSONS AND EQUIPMENT BEFORE YOU LOWER THE FLAPS. IF NOT, THE FLAPS CAN INJURE PERSONS OR BE DAMAGED BY EQUIPMENT.
(1) Lower the flaps: S Set the ALT/BAT switch to ON. S Set the flap selector to LDG. S When the flaps stop moving. S Set the ALT/BAT switch to OFF.
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