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(“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.
After switch selection, both FCUs will use the corresponding roll input (unjammed side). This will
enable the MFS to operate through their full range of operation with a single control column input.
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−43
SPOILER SYSTEM OPERATION
The spoiler system modes of operations are as follows:
Ground Lift Dumping
Ground lift dumping function commands extension of the spoilers when engines are equal to or
below idle and the ground condition is recognized. Engine throttle lever position is provided by
sensors in the throttle lever assembly.
Ground condition is determined from the airplane height provided by:
· Radio Altimeters (RA).
· Wheel speed, through the Brake Control Unit (BCU).
· WeightOnWheels(
WOW), through the Landing Gear Electronic Control Unit (LGECU).
The ground lift dumping system is fully automated or can be operated manually. Arming,
deployment and retraction is controlled by the FCUs.
In the event of a malfunction, failure of the automatic arming or disarming (automatic retraction),
the ground lift dumping system may be manually armed or manually disarmed through the GND
LIFT DUMP/AUTOBRAKE panel.
Arming
The system is automatically armed when the throttle levers are at the minimum takeoff
position.
The flight compartment ground lift dumping “MANUAL ARM” switch is provided in case of auto
arming failure and to test the system during preflight.
Deployment
All spoilers deploy simultaneously during a rejected takeoff.
The GS deploy first in order to dump the airplane lift; therefore, the logic is split for GS and MFS
operations.
To deploy ground spoilers the system must be armed, engine throttles at idle position (or below)
and two of the three following conditions:
· Radio Altimeter (RA) below 7 feet.
· Left or right main landing gear WOW indication.
· Left or right wheel speed greater than 16 knots.
Radio altimeter and wheel spin will normally be the first conditions satisfied. Deployment of the
MFS is delayed until the airplane is more firmly on the ground to prolong maximum roll control,
through the spoilers roll assist function.
To deploy multifunctional
spoilers the ground lift dumping must be armed, both the left and right
throttles at idle (or below) and:
· Both main landing gear have WOW.
AND
· Left or right wheel speed indication above 16 knots, OR radio altimeter below 7 ft.
When the MFS are commanded for ground lift dumping, roll assist is available for partial
multifunction
spoiler operation.
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
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