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SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-001
SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION
SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-001
General
These are the components of the speedbrake control system:
* Speedbrake lever
* Auto speedbrake actuator
* Ground spoiler control valve
* Ground spoiler interlock valve
* Ground spoiler actuators.
Speedbrake Lever
The speedbrake lever sends mechanical inputs to the spoiler
ratio changer. The ratio changer sends the inputs to the spoiler
mixer. When the speedbrake lever moves 29 degrees, the
spoiler mixer moves the ground spoiler control valve.
Auto Speedbrake Actuator
The auto speedbrake actuator moves the speedbrake lever
during landings and refused takeoffs (RTOs).
Ground Spoiler Control Valve
The ground spoiler control valve sends hydraulic power to the
ground spoiler interlock valve when the speedbrake lever
moves 31 degrees.
Ground Spoiler Interlock Valve
A push/pull cable moves the ground spoiler interlock valve
when the airplane is on the ground. When the interlock valve
moves, it permits hydraulic system A pressure to go from the
ground spoiler control valve to the ground spoiler actuators.
Ground Spoiler Actuators
The ground spoiler actuators use hydraulic system A pressure
to move the ground spoilers.
SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION - CABLE SYSTEM
EFFECTIVITY
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SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION - CABLE SYSTEM
SPEEDBRAKE CONTROL SYSTEM - GENERAL DESCRIPTION - CABLE SYSTEM
EFFECTIVITY
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Purpose
The pilots use the speedbrake lever to move the spoilers. All
the spoilers move up when the airplane is on the ground, and
only the flight spoilers move up when the airplane is in the air.
Location
The speedbrake lever is on the P10 control stand.
Physical Description
The speedbrake lever has detents at these positions:
* Down
* Armed
* Flight detent.
A placard next to the speedbrake lever shows the position of the
lever. The up position on the placard shows the maximum
position of the lever.
Full travel of the speedbrake lever is 48 degrees from the down
detent to the up position. The friction force on the speedbrake
lever is approximately 25 lbs.
When the speedbrake lever is more than 29 degrees, ground
spoilers 6 and 7 move 52 degrees and ground spoilers 1 and 12
move 60 degrees.
When the speedbrake lever is at the FLIGHT detent (35.5
degrees), flight spoilers 2, 3, 10, and 11 move 19.5 degrees and
flight spoilers 4, 5, 8, and 9 move 24.5 degrees. When the
speedbrake lever is full up (48 degrees), flight spoilers 2, 3, 10,
and 11 move 33 degrees and flight spoilers 4, 5, 8, and 9 move
38 degrees.
The table below describes the position of the flight spoilers and
the ground spoilers at some of the speedbrake lever positions.
All positions are shown in degrees.
Speedbrake Lever
Angle
Detent Flight Spoiler
Position
Ground Spoiler
Position
0 DOWN 0 0
4 ARMED 0 0
5 - 8 - start to move 0
29 - between 0 and 20/
22.5
52 / 60
35.5 FLIGHT 19.5 / 24.5 52 / 60
48 UP (no detent) 33 / 38 52 / 60
SPEEDBRAKE CONTROL SYSTEM - SPEEDBRAKE LEVER
EFFECTIVITY
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D633A101-GUN Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-003
SPEEDBRAKE CONTROL SYSTEM - SPEEDBRAKE LEVER
SPEEDBRAKE CONTROL SYSTEM - SPEEDBRAKE LEVER
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
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