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disarm the spoiler system.
GND LIFT
DUMPING
AUTO BRAKE
FLIGHT CONTROLS
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
10−10−43
SPOILER FUNCTIONS
The spoiler system performs the following:
· ROLL ASSIST − by asymmetric deployment of up to four pairs of MFS to augment the ailerons
control. The surface deflection is a function of the handwheel roll angle (derived from the
average of two sensors) compensated with airspeed and flaps position. Right wing down
command deploys the right spoilers, left remain stowed. Left wing down deploys the left
spoilers, right spoilers remain stowed.
· PROPORTIONAL LIFT DUMPING − by symmetric deployment of up to four pairs of MFS
commanded by the FSCL. Four pairs of MFS may be deployed when the flaps are fully
retracted. Two pairs (inboard) of MFS will deploy when the flaps are in any of their extended
position detents. Under this condition, the outboard MFS will be available for roll assistance
only.
· GROUND LIFT DUMPING − through the symmetric full extension of all spoilers upon landing
or rejected takeoff
condition. At initial touchdown with at least one left or right main landing
gear indicating onground
(wheels spinning up), the two pairs of GS deploy first. The
deployment of the two pairs of MFS is delayed (until weight on wheels) slightly to prolong roll
control.
· COMBINATION ROLL ASSIST AND PROPORTIONAL LIFT DUMPING − MFS control mixes
the roll command and proportional lift dumping command. To command a handwheel
command and a FSCL command, spoiler deployment of one wing decreases and increases on
the other. The roll effect is obtained by the differential deployment of left and right spoilers.
For roll assist and proportional lift dumping, the spoiler scheduling depends on handwheel roll
sensors and FSCL sensors. Corrections to the scheduling is a function of the airplane airspeed
provided by the three air data computers and flap position under control of the SFCUs.
SPLRS/STAB IN TEST
An advisory message “SPLRS/STAB IN TEST” will be displayed when the spoilers and stab trim
systems are performing selftest
when hydraulics are first applied. The spoiler system is inoperative
throughout the duration (approximately 20 seconds) of the test.
FLIGHT CONTROLS
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
10−10−44
ROLL SPOILER PRIORITY
The “ROLL SPLRS” priority switches are located on the glareshield at each pilot position. They are
released/pressed switches with a split legend, an amber “ROLL SEL” and a white “PLT ROLL”
(“CPLT ROLL”). During normal operation, the switches are not selected and remain dark. The MFSs
receive roll commands from the FCUs through sensor inputs from movement of each control column.
The roll commands are averaged from the sensor inputs to the FCUs for MFS operation, with the
disconnect system in the normal configuration.
JAMMED
AILERON CIRCUIT
ROLL
COMMAND
SENSOR
ROLL DISCONNECT SWITCH
ROLL SPLRS
CPLT CONT
ROLL
SEL
CPLT
ROLL
ROLL SPLRS
PLT CONT
ROLL
SEL
PLT
ROLL
In the event of a jammed aileron system, the pilots free the nonjammed
system by forcing the
disconnect mechanism. If no ROLL SPLRS switch selection is made within 30 seconds following
disconnect, the roll disconnect switch sends a signal to the FCUs which command both “ROLL SEL”
captions and a “ROLL SELECT” message to appear. Both “ROLL SEL” captions illuminate to
indicate to the pilot that a priority is required by switch selection, for MFS operation due to
disconnect. The 30 second time delay for illumination of the “ROLL SEL” captions is to avoid
increasing pilot workload in the instant following an aileron system failure.
JAMMED
AILERON CIRCUIT
ROLL
COMMAND
SENSOR
PILOT ROLL
PRIORITY SWITCH
COPILOT ROLL
PRIORITY SWITCH
LEGEND
Active Sensor Input
Inactive Sensor Input
ROLL
SEL
PLT
ROLL
Selecting the appropriate priority switch prior to or following a “ROLL SEL” indication, commands the
valid side to be used by the FCUs. Example above: if pilot side is selected, both pilot and copilot
“ROLL SEL” captions extinguish and the “PLT ROLL” caption illuminates and vice versa for a copilot
action. Until one side is selected, the FCUs continue to average pilot and copilot roll commands.
　
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