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CSP 700−6
Volume 2
10−10−44
SPOILER SYSTEM OPERATION (CONT'D)
Disarm
The logic automatically disarms after the airplane has been on the ground for 40 seconds following
touchdown and the wheel speed has decreased below 45 knots for 30 seconds. Automatic
disarming prevents the spoilers from deploying during taxiing. The system can also be manually
disarmed (turned off) to override the automatic arm/disarm circuits, through the ground lift dumping
“OFF” switch on the “GND LIFT DUMP/AUTOBRAKE” panel located in the centre pedestal.
SPOILER SYSTEM/FCU INTERFACE
The spoiler system operation is under control of two FCUs which have dual modules to control and
monitor the spoiler surfaces in pairs. The FCUs receive input from various airplane systems and
schedule the MFSs either symmetrically or proportionally depending on airplane configuration. The
FCUs also control and monitor the operation of the GS through valves within the ground spoiler
selector valves. Refer to the SPOILER CONTROL AND MONITORING this Chapter.
The FCUs control the priority of spoiler operations for flight and ground phases of operation and
spoiler system malfunctions are reported on the EICAS system.
The FCUs interface with the following systems for spoiler control and monitoring:
· BCU − Brake Control Unit provides wheel speed for Ground Lift Dumping (GLD) logic.
· LGECU − Landing Gear Electronic Control Unit provides WeightOnWheels
(WOW) for GLD
logic.
· DAUs − Data Acquisition Units provide hydraulic pressure data.
· ADCs − Air Data Computers provide airspeed data.
· RA − Radio Altimeter provides height for GLD.
· TQ − Throttle Quadrant assembly provides left and right throttle lever position sensors for GLD
logic.
· SFCU − Slat/Flap Control Unit provides flap position for Proportional Lift Dumping (PLD).
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−45
SPOILER FCU INPUT SCHEMATIC
ROLL
SEL
PLT
ROLL
ROLL
SEL
CPLT
ROLL
GND LIFT
DUMPING
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−46
SPOILER CONTROL AND MONITORING
Spoiler control and monitoring of the MFS and ground spoilers are as follows:
MultiFunctional
Spoilers
The MFS PCUs are hydraulically powered and electrically controlled. The FCU controls each PCU
servo valve and uses an integral sensor to determine their position. The PCUs incorporate a
hydraulic lock to prevent upfloat in the event of a hydraulic failure. The MFS surfaces use a
proximity sensor to detect that the surface is retracted.
The FCU provides monitoring of the PCU command, PCU response to the command, spoiler
surface through the proximity sensor and detection of interface electrical failures.
When a MFS panel failure is detected, the opposite panel will automatically be disabled, in order to
ensure lift dumping remains symmetrical.
Ground Spoilers
An electrically controlled ground spoiler selector valve is used to provide hydraulic pressure to
single actuators (at each panel), to either retract or extend a left or right pair of ground spoilers.
The FCU must energize two valves within the ground spoiler selector valve for a pair of ground
spoilers to deploy. Proximity sensors are used for monitoring and indication and to detect whether
a ground spoiler panel is retracted or not.
The actuators at each ground spoiler panel incorporates a hydraulic lock to prevent upfloat in the
event of a hydraulic failure. Each of the two FCUs controls and monitors one of the two pairs of
ground spoilers.
FLIGHT CONTROLS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
10−10−47
SPOILER EICAS MESSAGES
CONFIG SPOILERS
FLT SPOILERS FAIL
ROLL SPOILERS FAIL
GND LIFT DUMP
FLT SPLR DEPLOYED
SPLR LEVER FAIL
ROLL SELECT
"NO TAKEOFF"
Displayed during takeoff,
if
FLIGHT CONTROLS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
10−10−48
SPOILER EICAS MESSAGES (CONT'D)
FLT SPOILERS FAULT
GND LIFT DUMP
SPLRS/STAB IN TEST
NO TAKEOFF
GND LIFT DUMP OFF
GLD MANUAL ARM
PLT ROLL SPLRS
CPLT ROLL SPLRS
takeoff
(example: trims,
LIFT DUMPING switch
is selected to MANUAL ARM.
LIFT DUMPING switch
is selected OFF.
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