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1 AILERON TRIM Indicator
Indicates units of aileron trim.
2 RUDDER TRIM Indicator
Indicates units of rudder trim.
3 AILERON Trim Switches
Push (both switches) – trims ailerons in desired direction.
4 RUDDER Trim Selector
Spring–loaded to neutral.
Rotate -
• trims rudder in desired direction
• cancels rudder trim centering
5 Rudder Trim Centering (CTR) Light
Illuminated - Rudder Trim Centering switch has been pushed and trim is moving
to zero.
6 Rudder Trim Center Switch
Push – rudder trim moves to zero units.
Yaw Damper Controls
1 Yaw Damper Switches
ON – yaw damper powered.
1
INOP
YAW DAMPER
UPPER LOWER
ON ON
INOP
OVERHEAD PANEL
2
April 01, 2001
747 Operations Manual
Flight Controls -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 9.10.5
2 Yaw Damper Inoperative Light
Illuminated –
• yaw damper switch OFF, or
• yaw damper inoperative.
Rudder/Brake Pedals
1 Rudder Pedals
Push – deflects rudders in desired direction.
Refer to Chapter 14, Landing Gear, for brakes and nosewheel steering description.
1
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
9.10.6 D6-30151-425
Flight Controls -
Controls and Indicators
Speedbrake Lever
On the ground -
• speedbrake lever moves to UP and all spoiler panels extend when either
engine 2 or engine 4 reverse thrust lever raised to idle detent with engine 1
and engine 3 thrust levers retarded
• speedbrake lever moves to DN and all spoiler panels retract if engine 1 or
engine 3 thrust lever advanced
1 Speedbrake Lever
DN (down) (detent) – all spoiler panels retracted
ARM (armed) –
• automatic speedbrake system armed
• after landing, speedbrake lever moves to UP and spoiler panels extend if
engine 1 and engine 3 thrust levers retarded
FLIGHT DETENT -
• spoiler panels extend to their maximum in-flight positions
• in flight, aft movement of speed brake lever limited to FLIGHT DETENT
by an automatic stop
UP – all spoiler panels extend to their maximum in–flight or on–ground position
(intermediate positions can be selected).
CONTROL STAND
1
UP
DETENT
FLIGHT
ARM
DN
April 01, 2001
747 Operations Manual
Flight Controls -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 9.10.7
Flap System
Flap Controls
1 Flap Gate
1 – prevents inadvertent retraction of remaining leading edge flap groups
EXT
OFF
RET
ARM
ALTN
ALTN FLAPS
GROUPS EXTENDED.
LEADING EDGE FLAP
INBOARD AND MIDSPAN
EDGE FLAP
GROUPS
EXTENDED
TAKEOFF
GATES
LANDING
RANGE
RANGE
ALL LEADING
ALL FLAPS
RETRACTED
TRAILING EDGE
FLAPS RETRACTED
2
3
4
CONTROL STAND
CENTER PANEL
1
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
9.10.8 D6-30151-425
Flight Controls -
Controls and Indicators
20 – prevents inadvertent retraction of flaps past go-around position.
2 Flap Lever
Primary mode - postions leading edge flaps pneumatically and trailing edge flaps
hydraulically.
Secondary Mode - positions leading and/or trailing edge flaps electrically if flaps
fail to drive pneumatically or hydraulically.
3 Alternate (ALTN) Flaps Selector
RET (retract ) – leading and trailing edge flaps electrically retracted.
OFF – alternate flaps deactivated.
EXT (extend) –
• leading and trailing edge flaps electrically extend
• maximum extension is flaps 25
4 Alternate (ALTN) Flaps Arm Switch
ALTN –
• arms flap alternate control mode
• arms Alternate Flaps selector
• shuts off primary and secondary mode operation
• asymmetry protection not available
• Flap lever inoperative
Flap Limit Placard
1 Flap Limit Placard
Flaps extended speed limits.
20 - 230K
30 - 180K
25 - 205K
10 - 240K
5 - 260K
1 - 280K
FLAP LIMIT
CENTER PANEL
1
April 01, 2001
747 Operations Manual
Flight Controls -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
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波音747-441操作手册2(16)
