27-60-00
ALL ú ú 01 Page 108 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SPOILER CONTROL SYSTEM - DESCRIPTION AND OPERATION
__________________________________________________
1. General_______
A. The spoiler control system supplements the ailerons in providing lateral control of the airplane about the roll axis. There is a total of 12 spoilers of which 10 are flight spoilers and 2 are ground spoilers. Only the flight spoilers are used with the spoiler control system. However, the flight spoilers are used with the ground spoilers in the speed brake control system (Ref 27-60-00/1) for speed brake operation. The spoilers are numbered 1 thru 12 from left to right (Fig. 1). The four outermost spoilers on each wing are identified as outboard flight spoilers. The next spoiler on each side, No. 5 and 8, are identified as inboard flight spoilers. The two remaining spoilers, No. 6 and 7, are ground spoilers.
B. The flight spoilers are positioned hydraulically and controlled directly by the aileron control system (Fig. 2). Actuation of the spoilers is accomplished by a flight spoiler control package for each spoiler. The airplane main hydraulic systems No. 2, 3, and 4 supply pressure to the flight spoiler control packages. The hydraulic pressure for operation of spoilers No. 2, 3, 10, and 11 comes from hydraulic system No. 2. Hydraulic pressure for operation of spoilers No. 1, 4, 9, and 12 comes from hydraulic system No. 3. Pressure for operation of spoilers 5 and 8 comes from hydraulic system No. 4.
C. The control input for operation of the flight spoilers comes from the central lateral control packages through the spoiler control differential mechanisms and then by cables to the control valves of the flight spoiler control packages. The central lateral control packages are part of the lateral control system operated by the aileron control system (Ref 27-10-00/1).
2. Spoilers (Fig. 3)________
A. The spoilers are located on the upper surface of each wing trailing edge. In the retracted position, the spoilers are flush with the wing surface. The spoiler panels are hinged from the rear spar of the wing box, and are monocoque structures with four hinges used for each panel. The spoilers are composed of an aluminum alloy honeycomb bonded structure with aluminum alloy fittings and spar. The maximum extension and retraction limits for each spoiler are controlled by the main actuator of the spoiler control package. Spoiler extension is limited by aerodynamic forces in proportion to airspeed. Flight spoiler panels No. 1 thru 4 and 9 thru 12 are interchangeable. Flight spoiler panels No. 5 and 8 are also interchangeable.
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27-61-00
ALL ú ú 01 Page 1 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
ON SPOILERS NO. 4 AND 12
Spoiler Control System Component LocationFigure 1 (Sheet 1)
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27-61-00
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
AILERON CONTROL
WHEEL
CAPTAIN'S
CONTROL COLUMN
FIRST OFFICER'S
CONTROL COLUMN
CABLE AB
CABLE AA
SEE B
SEE C
FLT CONTROL HYD POWER
12 34
1
NORM
TAIL
SHUT
OFF
VALVE
VALVE VALVE VALVE
CLOSED a
CLOSED CLOSED a CLOSED
a
a FLIGHT COMPARTMENT
1
NORM
WING
SHUT
OFF
VALVE VALVE VALVE VALVE
CLOSED CLOSED a CLOSED a CLOSED a
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