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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-003
THIS PAGE IS INTENTIONALLY LEFT BLANK
SPEEDBRAKE CONTROL SYSTEM - SPEEDBRAKE LEVER
27-62-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
Purpose
The speedbrake lever brake transfers speedbrake lever
movement to the forward drum. It also supplies a friction
force to the speedbrake lever to prevent accidental movement
of the speedbrake lever.
The speedbrake forward drum connects the speedbrake lever
to the speedbrake lever cables. The speedbrake forward drum
also has cams that operate switches.
The switches operate the auto speedbrake function and send
data to other systems.
The auto speedbrake actuator moves the speedbrake lever to
operate the ground spoilers during landings and refused
takeoffs.
Location
These components are below the flight deck floor
* Speedbrake lever brake
* Speedbrake forward drum
* Speedbrake arming switch
* Speedbrake lever position switch
* Speedbrake lever position sensor
* Auto speedbrake actuator.
To get access, go through the forward lower nose compartment
access door.
Speedbrake Lever Brake
The lever brake receives inputs from the speedbrake lever and
the auto speedbrake actuator. The lever brake uses these
inputs to move the forward drum.
The lever brake has a no-back brake assembly. This permits
movement of the auto speedbrake actuator to backdrive the
speedbrake lever, but prevents the speedbrake lever from
moving the auto speedbrake actuator. It also permits the pilot to
override the position of the auto speedbrake actuator.
Speedbrake Forward Drum
The speedbrake forward drum receives inputs from the lever
brake and operates these components:
* Speedbrake lever cables
* Speedbrake arming switch
* Speedbrake lever position switch
* Speedbrake lever position sensor.
The speedbrake forward drum also has a detent cam. The
detent cam has the arm detent and the flight detent for the
speedbrake lever.
The speedbrake lever cables supply inputs to the spoiler ratio
changer.
SPEEDBRAKE CONTROL SYSTEM - FORWARD COMPONENTS
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
27-62-00-004
Speedbrake Arming Switch
The speedbrake arming switch supplies inputs to the auto
speedbrake module for the auto speedbrake operation. This
switch operates when the speedbrake lever moves from the
DOWN detent to the ARM detent.
Speedbrake Lever Position Switch
The speedbrake lever position switch supplies a signal to
operate the SPEEDBRAKES EXTENDED light on the P3 panel.
This switch operates when the speedbrake lever moves 7.5
degrees from the DOWN detent position.
Speedbrake Lever Position Sensor
The speedbrake lever position sensor has a single internal
synchro that receives 28v AC, 400 Hz excitation. The sensor
sends data to the digital flight data acquisition unit (DFDAU).
The speedbrake lever position sensor is interchangeable with
some of the other position transmitters that send data to the
DFDAU.
Auto Speedbrake Actuator
The auto speedbrake actuator connects to the speedbrake lever
brake. The actuator uses 28v DC power and has internal limit
switches. When the actuator extends, the lever brake moves the
speedbrake lever and the forward drum. The forward drum
moves the speedbrake lever cables to operate the spoilers.
The auto speedbrake actuator does not move when the pilot
moves the speedbrake lever manually.
SPEEDBRAKE CONTROL SYSTEM - FORWARD COMPONENTS
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
27-62-00-004
SPEEDBRAKE CONTROL SYSTEM - FORWARD COMPONENTS
SPEEDBRAKE CONTROL SYSTEM - FORWARD COMPONENTS
EFFECTIVITY
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D633A101-GUN Jun 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-004
Purpose
The speedbrake RTO switch sends a signal to the auto
speedbrake module. This operates the auto speedbrake
function during refused takeoffs.
The speedbrake takeoff warning switch sends a signal to the
proximity switch electronics unit (PSEU) for the takeoff warning
　
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