57-57-01
ALL ú ú 01 Page 1 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
GROUND SPOILERS (TYP)
BOTTOM VIEW
Ground Spoilers
Figure 1
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57-57-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FLIGHT SPOILERS - DESCRIPTION AND OPERATION
___________________________________________
1. General (Fig. 1)_______
A. There are 10 flight spoilers, 5 on each outboard wing. Four are in a group on each side of the airplane between the engine nacelles, the fifth is located inboard of the inboard nacelle. Spoilers No. 1 through 5 are located on the left side, and spoilers No. 8 through 12 are located on the right side. The outboard four spoilers are attached to the wing rear spar by hinge fittings. The inboard flight spoiler attaches to hinge support fittings on the trailing edge support beam. Spoilers No. 1 through 4 and No. 9 through 12 are interchangeable; and spoilers No. 5 and 8 are interchangeable (Ref 57-42-00, Description and Operation).
B. The flight spoilers serve as auxiliary flight control surfaces to assist the ailerons in lateral control of the airplane, and as speed brakes in flight and after touchdown. Each spoiler is pivoted by a hydraulic control package through a travel range of 45 degrees. Wells are provided in the wing trailing edge upper surface structure so that the spoilers fair in the retracted position.
2. Inboard Flight Spoiler Structure (Fig. 1)________________________________
A. Each inboard flight spoiler (No. 5 and 8) is of bonded construction, consisting primarily of a spanwise leading edge spar, a wedge-shaped trailing edge section, and three hinge support fittings.
B. The three-piece spar consists of an aluminum alloy extruded channel at each end spliced into the center (hinge and control package) fitting.
C. The trailing edge section is of honeycomb sandwich construction utilizing an aluminum alloy core and face sheets also of aluminum alloy. Doublers of aluminum alloy are bonded to the face sheets in the vicinity of the hinge fittings to provide reinforcement. A teflon-coated phenolic rub strip is bonded to the lower skin at the trailing edge to minimize chafing between the spoiler and spoiler well in the faired position. The closure ribs consist of an aluminum alloy web and upper chord and a lower chord of fiberglass laminate.
D. The four aluminum alloy hinge fittings with self-aligning bearings are attached to the spar. The center fitting provides an attaching point for the control package as well as two hinge points. The outer hinge fittings have slotted bearing holes to allow for structural deflection without overloading the bearings.
E. Aerodynamic seals are installed on the inboard and outboard edges and the leading edge to eliminate air gaps.
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57-57-02
ALL ú ú 01 Page 1 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEE A
SEEB
SPAR
HINGE AND
ACTUATOR
FITTING
DOUBLERS
HINGE FITTING (2 PLACES)
RUB STRIP
UP SPAR
INBOARD FLIGHT SPOILER
FWD
BOTTOM VIEW
DOUBLERS
A
HINGE AND ACTUATOR FITTING
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