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SPEEDBRAKE CONTROL SYSTEM - GROUND SPOILERS
27-62-00
Page 30
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The auto speedbrake module and the auto speedbrake relays
control the automatic operation of the speedbrakes. The auto
speedbrake module and the auto speedbrake relays use data
from these sources:
* Speedbrake arming switch
* Speedbrake refused takeoff switch
* Autothrottle microswitch packs
* Antiskid/autobrake control unit
* Air/ground relays (2)
* Antiskid sense relays (2)
* Flight control computers (FCCs) (2)
* R/A < 10 feet relays (2).
Landing
During landing, the auto speedbrake operates when all these
conditions occur:
* The altitude is less than 10 feet from the flight control
computers to the R/A < 10 ft relays,
* The main landing gear is on the ground or the main landing
gear wheels spin up,
* The speedbrake lever is in the armed position,
* Both left and right thrust levers are at idle.
Before landing, the pilots arm the speedbrake lever. During the
flare or at touchdown, the pilots move both thrust levers to idle.
Just after touchdown, the auto speedbrake actuator fully
extends the speedbrake lever. This commands all spoilers to
move up.
The auto speedbrake actuator retracts if either thrust lever is
more than the idle position.
NOTE: The auto speedbrake actuator does not retract when
you move the speedbrake lever to the down position.
Refused Takeoffs (RTO)
During a RTO, when the pilot moves at least one of the thrust
reverser levers, the speedbrake refused takeoff switch closes.
This permits the auto speedbrake actuator to extend fully. This
commands all spoilers to move up.
The auto speedbrake actuator retracts if either thrust lever is
more than the idle position.
Indications
The auto speedbrake module controls the amber SPEEDBRAKE
DO NOT ARM light and the green SPEEDBRAKE ARMED light.
The auto speedbrake module also sends signals to the flight
data aquisition unit for reporting purposes.
SPEEDBRAKE CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - AUTO SPEEDBRAKE
EFFECTIVITY
GUN ALL 27-62-00
Page 31
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-013
See the flight data recording system (FDRS) section for more
information about the FDAU. (SECTION 31-31)
The SPEEDBRAKE DO NOT ARM light comes on when the
automatic operation of the speedbrake system does not arm
correctly. This occurs when the speedbrake lever is in the
ARMED detent or either thrust lever is in reverse, and one of the
these occurs:
* Antiskid system inoperative
* Auto speedbrake actuator not retracted
* Disagreement between the wheel spin speeds and air/
ground signals
* Internal faults in the auto speedbrake module.
The SPEEDBRAKE ARMED light comes on when the automatic
operation of the speedbrake system does arm correctly. This
occurs when the speedbrake lever is in the ARMED detent or
either thrust lever is in reverse, and all of these occur:
* One or more antiskid channel operates
* Auto speedbrake actuator retracted
* No disagree in the wheel spin speeds and air/ground
signals.
The SPEEDBRAKE ARMED light also comes on when the auto
speedbrake module sends a raise command to the auto
speedbrake relays.
There are four wheel spin-up lights on the auto speedbrake
module face plate. 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 - FUNCTIONAL DESCRIPTION - AUTO SPEEDBRAKE
EFFECTIVITY
GUN ALL 27-62-00
Page 32
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
27-62-00-013
SPEEDBRAKE CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - AUTO SPEEDBRAKE
SPEEDBRAKE CONTROL SYSTEM - FUNCTIONAL DESCRIPTION - AUTO SPEEDBRAKE
EFFECTIVITY
GUN ALL 27-62-00
Page 33
D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
　
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