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control the speedbrake function.
See the speedbrake control section for more information on the
speedbrake control system. (SECTION 27-62)
Auto Speedbrake Control
The auto speedbrake function supplies automatic extension or
retraction of all the spoilers during landing and refused takeoff.
See the speedbrake control system section for more
information on the auto speedbrake function. (SECTION 27-62)
Abbreviations and Acronyms
* alt - altitude
* BITE - built-in test equipment
* deg - degrees
* DFCS - digital flight control system
* DFDAU - digital flight data acquisition unit
* FCC - flight control computer
* ft - feet
* fwd - forward
* gnd - ground
* Hz - hertz
* in - inch
* MLG - main landing gear
* PCU - power control unit
* prox - proximity
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* PSEU - proximity switch electronics unit
* RTO - refused takeoff
* sect - section
* spdbk - speedbrake
* splr - spoiler
* sw - switch
* sys - system
* TD - time delay
* TE - trailing edge
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General
The flight crew uses the control wheels and speedbrake lever to
manually move the flight spoilers. The autopilot controls them
during autoland.
Manual Operation - Control Wheels
The flight crew uses the control wheels to control the roll. The
control wheel gives mechanical input through the feel and
centering unit to the aileron power control units (PCUs). The
aileron PCUs supply mechanical inputs through the spoiler
mixer and ratio changer to the flight spoiler actuators. Hydraulic
pressure from the spoiler shutoff valves goes to the actuators.
After a specified amount of control wheel movement, a control
valve in each flight spoiler actuator permits hydraulic power to
move the actuators. Each actuator moves a flight spoiler.
The flight crew uses the spoiler shutoff switches on the P5 aft
overhead panel to close the spoiler shutoff valves. This stops
the hydraulic power to the flight spoiler actuators and the flight
spoilers move down.
There is no manual reversion for the flight spoilers.
Manual Operation - Aileron Trim
During aileron trim, the aileron trim switches cause the trim
actuator to move the feel and centering unit. This movement
goes to the flight spoiler actuators. The actuators move the flight
spoilers only if there is a large amount of trim.
See the ailerons section for more information on the aileron and
aileron trim control system. (SECTION 27-11)
Autopilot Operation
When engaged, the autopilot system gives mechanical input to
the aileron system. The aileron PCUs supply inputs to the flight
spoiler actuators. The actuators move the flight spoilers if the
flight control computers (FCCs) command is more than a
specified amount of control wheel movement.
See the ailerons section for more information on the aileron
autopilot operation. (SECTION 27-11)
Speedbrake Operation
The flight crew uses the speedbrake lever to control the
speedbrake operation. The speedbrake lever supplies
mechanical inputs through the spoiler mixer and ratio
changer to the flight spoiler actuators. The spoiler mixer
mixes the control wheel input with the speedbrake lever input.
The actuators move the flight spoilers on each wing
symmetrically.
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