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SHUT OFF – shuts off hydraulic power to respective flight control surfaces.
2 Valve Closed Light
Illuminated (amber) – hydraulic system flight control valve is closed.
NORM
NORM
OFF
SHUT
OFF
SHUT
2 3 4
FLT CONTROL HYD POWER
TAIL
WING
CLOSED
VALVE
CLOSED
VALVE
CLOSED
VALVE
CLOSED
VALVE
CLOSED
VALVE
CLOSED
VALVE
CLOSED
VALVE
1
CLOSED
VALVE 1
2
OVERHEAD MAINTENANCE PANEL
April 01, 2001
747 Operations Manual
Flight Controls Chapter 9
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 9.20.1
Introduction
The primary flight controls are elevators, ailerons, and rudders. The control
column, control wheel, and rudder pedals control these flight control surfaces. The
primary flight controls are redundantly powered from the four airplane hydraulic
systems; there is no manual reversion.
Secondary flight controls include a moveable horizontal stabilizer, spoilers, and
leading and trailing edge flaps. Spoilers operate differentially to assist ailerons for
roll control and symmetrically as speedbrakes.
Pilot Controls
The pilot controls consist of:
The control columns and rudder pedals are connected through jam shearout
mechanisms. Control Wheels are connected through jam override and shearout
mechanisms. If a jam occurs, the pilots can maintain control by applying force to
the other control.
The Speedbrake lever allows manual or automatic symmetric actuation of the
spoilers.
Trim switches allow the pilots to adjust flight control surfaces to reduce flight
control pressures.
Flight Control Surfaces
Pitch control is provided by:
• four elevator surfaces
• a moveable horizontal stabilizer
Roll control is provided by:
• four ailerons
• ten spoilers
Yaw control is provided by an upper and lower rudder.
• two control columns
• two control wheels
• two pairs of rudder pedals
• control wheel stabilizer trim
switches
• alternate stabilizer trim
switches
• speedbrake lever
• flaplever
• aileron trim switches
• rudder trim control
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
9.20.2 D6-30151-425
Flight Controls -
System Description
Increased lift and decreased stall speed for takeoff and landing are provided by
leading and trailing edge flaps.
Flight Control Surface Locations
Pitch Control
Four elevator surfaces hinged at the rear of the horizontal stabilizer and a
moveable horizontal stabilizer provide pitch control.
Elevator Control
Control column inputs transfer mechanically to hydraulic actuators on the inboard
elevator control surfaces. Inboard elevator position controls input for the related
adjacent outboard elevator actuator. Shearouts between the inboard and outboard
elevators allow elevator control to be regained if a jam occurs and a significant
manual force is applied to the control columns.
Left and right outboard elevator positions display on the EICAS status display. A
full scale indication corresponds to maximum elevator deflection.
An elevator feel mechanism provides artificial feel at control columns. The force
increases as airspeed increases. Hydraulic systems 2 and 3 power the feel
mechanism. Loss of one of the hydraulic systems does not affect feel forces. If
both hydraulic systems fail, mechanical springs provide feel forces. Feel force is
no longer a function of airspeed.
RUDDER
LOWER
RUDDER
UPPER
INBOARD
AILERON
INBOARD AILERON
INBOARD
FLAP
FLAP
OUTBOARD
STABILIZER
SPOILERS
LEADING EDGE FLAPS
OUTBOARD
ELEVATOR
OUTBOARD
ELEVATOR
April 01, 2001
747 Operations Manual
Flight Controls -
System Description
Copyright © The Boeing Company. See title page for details.
D6-30151-425 9.20.3
Elevator Control Diagram
Stabilizer Trim
The stabilizer trim system provides pitch trim by varying the angle of incidence of
the horizontal stabilizer. Normal and alternate electrical channels control two
stabilizer trim control modules. Each control module hydraulically powers a trim
actuator. Actuator outputs mechanically sum to drive the stabilizer. Trim rate is
reduced at high airspeeds.
N_O_T__E: Numbers in boxes refer
to hydraulic systems. FEEL
　
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