27-CONTENTS
GUN Page 30 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CHAPTER 27 - FLIGHT CONTROLS
TABLE OF CONTENTS
_________________
Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
Inspection/Check 601 [*] [*] AIRPLANES WITH RIVETS AT TORQUE TUBE END FITTINGS
Approved Repairs 801 ALL
LEADING EDGE FLAP PROXIMITY 27-88-00
SWITCHES
Description and Operation 1 ALL General 1 Assembly - Sensitive 1
Annunciator Feeedback Switch
Unit - Flap Control 1
Operation 1
Adjustment/Test 501 ALL Operational Test 501 SWITCH ASSEMBLY - SENSITIVE 27-88-01 ANNUNCIATOR FEEDBACK Removal/Installation 401 ALL
27-CONTENTS
GUN Page 31 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FLIGHT CONTROLS - DESCRIPTION AND OPERATION
___________________________________________
1. General (Figs. 1 and 2)_______
WARNING: FIRE RESISTANT HYDRAULIC FLUIDS CONFORMING TO BMS 3-11 MAY CAUSE
_______ SKIN IRRITATION. AVOID PROLONGED OR REPEATED CONTACT WITH THE SKIN. IN CASE OF EYE CONTACT, FLUSH THE EYES WITH WATER AND OBTAIN MEDICAL AID. IN CASE OF INGESTION, OBTAIN MEDICAL AID.
A. Primary controls of airplane flight attitude are ailerons, elevators, and rudders. These primary control surfaces are positioned by hydraulic actuators powered by the airplane's four independent hydraulic systems. The surfaces are controlled from the flight compartment with aileron control wheels, elevator control columns, and rudder pedals.
B. Secondary controls consist of spoilers, trailing edge flaps, leading edge flaps, and an adjustable horizontal stabilizer. Spoilers are hydraulically powered. When used for lateral control, the spoilers are controlled by a mechanical output from the aileron control system. When used as speed brakes, the spoilers are controlled from the speed brake lever on the pilots' control stand. Trailing edge flaps are normally driven by hydraulic power and leading edge flaps by pneumatic power. All flaps are controlled from the flap control lever on the pilots' control stand. All flaps may be driven by electric motors as an alternate means of power. The electric motors are controlled by the flap control lever, or may be controlled directly by switches on the pilots' center instrument panel. The horizontal stabilizer is positioned by hydraulic motors controlled by switches mounted in the aileron control wheels. There are also switches on the pilots' control stand which override all other command signals to position the stabilizer.
C. The lateral control system is trimmed by shifting the neutral position of the aileron control system with an electric motor-driven aileron trim actuator. The actuator is controlled by switches on the pilots' control stand. The directional control system is trimmed by shifting the neutral position of the rudder control system with an electric trim actuator controlled by the rudder trim knob on the pilots' control stand. Pitch trim of the airplane is set by the position of the horizontal stabilizer.
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27-00-00
ALL ú ú 01 Page 1 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
UPPER RUDDER
LOWER RUDDER
INBOARD ELEVATOR 12 OUTBOARD 11
ELEVATOR 10 STABILIZER
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