2.

3.

A
747-400 MAINTENANCE MANUAL
 SPOILERS - DESCRIPTION AND OPERATION
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General (Fig. 1)
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 A.  The spoilers are hydraulically actuated control surfaces hinged to the upper surface on both sides of the wing. A group of four spoilers is located between the engine nacelles on each outboard wing and is supported by fittings attached to the wing rear spar. Another group of two spoilers is installed just inboard of the inboard engine nacelle on each wing and is supported by fittings attached to the trailing edge beam. The spoilers are identified in numerical sequence beginning with the outboard spoiler on the left outboard wing and progressing to the outboard spoiler on the right outboard wing.
 B.  In the retracted position, the spoilers fit into spoiler wells and fair with the wing trailing edge upper surface. Each spoiler has a hydraulic power control package which can pivot the spoiler through a range of 45 degrees.
Ground Spoilers
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 A.  Spoilers No. 6 and 7 are ground spoilers and are used only to assist the flight spoilers in braking after touchdown.
 B.  The ground spoilers are of monocoque design and consist basically of aluminum alloy bonded honeycomb structure attached to the spar. Each spoiler has four hinge points.
 C. Refer to 27-62-00 for additional information.Flight Spoilers
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 A.  Spoilers No. 1 thru 4 and No. 9 thru 12 are the outboard flight spoilers of the left and right wings respectively; spoilers No. 5 and 8 are the inboard flight spoilers on the left and right outboard wings respectively. The flight spoilers are auxiliary flight control surfaces, since they supplement the ailerons in providing lateral control of the airplane. They also serve as speed brakes to reduce airspeed in flight and to aid in braking after touchdown.
 B.  Construction and attachment is similar to that of the ground spoilers.
 C.  Refer to 27-61-00 for additional information.
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 57-57-00
 ALL  ú ú 01 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Spoiler Location
Figure 1

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 57-57-00
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
 GROUND SPOILERS - DESCRIPTION AND OPERATION
___________________________________________
 1.  General (Fig. 1)_______
 A.  There are two ground spoilers, one on each wing. They are the spoilers closest to the fuselage and are attached by hinge fittings to the upper portion of the wing trailing edge beam. Spoiler No. 6 is located on the left outboard wing and No. 7 is on the right outboard wing. They are interchangeable (Ref 57-42-00).
 B.  The function of the ground spoilers is to assist the flight spoilers as speed brakes by increasing aerodynamic drag and reducing lift after airplane touchdown. Each spoiler is positioned by a hydraulic control package through a travel range of 45 degrees from the faired position. Spoiler wells in the wing trailing edge upper surface structure house the spoilers in the retracted position so that the spoilers fair with the upper skin.
 2.  Ground Spoiler Structure________________________
 A.  Each spoiler 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.
　
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