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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-005
Purpose
The auto speedbrake module controls the auto speedbrake
function.
Location
The auto speedbrake module is on the E4-2 rack in the
electronic equipment compartment.
Interfaces
The auto speedbrake module receives data from these
components:
* Speedbrake arming switch
* Speedbrake refused takeoff switch
* Autothrottle microswitch packs
* Antiskid/autobrake control unit
* Air/ground relays
* Antiskid sense relays.
The auto speedbrake module controls these components:
* Four auto speedbrake relays
* Auto speedbrake actuator
* SPEEDBRAKE ARMED light
* SPEEDBRAKE DO NOT ARM light
* Wheel spin-up lights on the auto speedbrake module front
panel.Speedbrake SOV relays
The auto speedbrake module also sends signals to the flight
data aquisition unit (FDAU).
See the flight data recording system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
Wheel Spin-Up Lights
There are four wheel spin-up lights on the auto speedbrake
module front panel. The lights come on when the main landing
gear wheels turn faster than 60 knots and either the speedbrake
arming switch closes or the speedbrake refused takeoff switch
closes. There is one light for each wheel.
Two of the lights (DS3 and DS4) also come on for four seconds
after the airplane goes from in the air to on the ground.
SPEEDBRAKE CONTROL SYSTEM - AUTO SPEEDBRAKE MODULE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-008
SPEEDBRAKE CONTROL SYSTEM - AUTO SPEEDBRAKE MODULE
SPEEDBRAKE CONTROL SYSTEM - AUTO SPEEDBRAKE MODULE
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-008
Purpose
The ground spoiler control valve receives inputs from the
spoiler mixer and sends hydraulic system A pressure to the
ground spoiler interlock valve.
Location
The ground spoiler control valve is on the forward bulkhead of
the main landing gear wheel well. It is right of the spoiler mixer
and ratio changer.
Physical Description
A control rod connects the ground spoiler control valve to the
spoiler mixer. During speedbrake lever movement, the control
rod moves the ground spoiler control valve.
SPEEDBRAKE CONTROL SYSTEM - GROUND SPOILER CONTROL VALVE
EFFECTIVITY
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Page 22
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-009
SPEEDBRAKE CONTROL SYSTEM - GROUND SPOILER CONTROL VALVE
SPEEDBRAKE CONTROL SYSTEM - GROUND SPOILER CONTROL VALVE
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-009
Purpose
The ground spoiler interlock valve lets the ground spoilers
operate only when the airplane is on the ground.
This valve sends hydraulic system A pressure from the ground
spoiler control valve to the ground spoiler actuators when the
right main landing gear compresses.
Location
The ground spoiler interlock valve is in the forward, upper, right
corner of the main landing gear wheel well. It is outboard of the
hydraulic system B reservoir.
Physical Description
The ground spoiler interlock valve is a mechanically operated
hydraulic valve that is spring loaded to the air mode position.
A push/pull cable attaches to the ground spoiler interlock valve
and to the right main landing gear upper torsion link. When the
right main landing gear compresses during landing, the cable
pulls on the input crank of the interlock valve. The interlock
valve then moves to the ground mode position and sends
hydraulic power from the ground spoiler control valve to the
ground spoiler actuators.
The ground spoiler interlock valve also has a proximity sensor
and a pressure switch. The target for the proximity sensor is
near when the airplane is in the air and the target is far when
the airplane is on the ground. The pressure switch closes when
the pressure to the ground spoiler actuators is more than 750
psi.
The proximity sensor and the pressure switch send their data to
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