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are deployed in flight and:
• the aircraft radio altitude between 10 and 300 feet AGL, or
• the left or right engine N1 is greater than 79%, or
• if radio altitude is not available, at any time the landing gear is extended
If the flight spoilers are not stowed with the aircraft in takeoff mode, a CONFIG
SPOILERS warning EICAS message and aural warning will be displayed/sounded.
20° Detent Mechanism
A 20° detent mechanism prevents asymmetrical deployment of the flight spoilers in
the event of a disconnected input linkage. The PCU control valves are spring-loaded
retracted, but the detent mechanism will apply force to hold a mid-position if the
spoiler has been deployed to greater than 20°. When on the ground with hydraulic
pressure available, a sensor on each detent mechanism will generate a FLT SPLRS
caution EICAS message, and cause the appropriate flight spoiler outline to turn amber
on the Flight Control Synoptic page, if the spoiler position does not correspond to the
detent position.
FLIGHT CONTROLS
For Training Purposes Only
May 03
10-17
P I LOT T R A I N I N G GU I D E
Flight and Ground Spoilers - Schematic
Figure 10-10
FLIGHT CONTROLS
FLAPS 30
AIL AIL
EICAS FLIGHT CONTROLS SYNOPTIC PAGE
(SECONDARY DISPLAY)
Flight
Spoiler
Position
Indicator
1 2
1 2
FLIGHT
SPOILER
FLIGHT
SPOILER
GROUND
SPOILER
GROUND
SPOILER
PROXIMITY
SENSOR
ELECTRONIC
UNIT
PROXIMITY
SENSOR
ELECTRONIC
UNIT
SUBSYSTEM A SUBSYSTEM B
GROUND
SPOILER
SOLENOID
VALVE
1
BATT
BUS
BATT
BUS
SPLR
UP
SPLR
UP
LH
THROTTLE
AT IDLE
RH
THROTTLE
AT IDLE
LH
THROTTLE
ABOVE MIN
TAKEOFF
RH
THROTTLE
ABOVE MIN
TAKEOFF
DC
BUS 2
DC
BUS 1
SYSTEM
INPUTS
1
MECHANICAL
INPUT
P604_10_006
Ground
Spoiler
Indicator
L ARMED
EMER STOW
OFF
R ARMED
OFF
GND SPOILERS
THRUST
REVERSER
ARM
AUTO
DISARM
UNLK UNLK
L R
FLIGHT
SPOILER
1/4
0
RETRACT
1/2
3/4
MAX
FLIGHT CONTROLS
10-18 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
Ground Spoilers
The inboard spoiler panels on each wing are the ground spoilers. The ground spoilers
have only two positions: retracted or fully deployed to 45°. A single actuator powered
by hydraulic system 1 operates each ground spoiler.
After touchdown or during a rejected takeoff, the ground spoilers extend to dump lift
and increase drag to assist in aircraft braking. Ground spoiler deployment is normally
automatic but can be activated manually by the pilot.
In the automatic or manual modes, arming, deployment and retraction is controlled by
the Proximity Sensor Electronic Unit (PSEU). The PSEU monitors inputs from the
following:
• ground spoiler arming switch
• thrust lever position microswitches
• ground spoiler surface position
• flight spoiler lever position switch
• anti-skid control unit (wheel speed)
In the event of a malfunction or failure of the automatic arming and disarming logic,
the ground spoiler system may be manually armed or disarmed through the GND
SPOILERS panel, located on the center pedestal.
Spoiler position is indicated on both the EICAS Status and FLIGHT CONTROLS
synoptic pages, using white arrows which move upward toward lines, indicating
relative extension (for the flight spoilers only), and full extension (for both flight and
ground spoilers). When the flight and ground spoilers are fully retracted, all EICAS
spoiler icons and position arrows disappear.
Ground Spoiler Arming Logic
The ground spoiler circuit must be armed before deployment can take place. The
ground spoilers are armed or disarmed by the three-position GND SPOILERS switch,
located on the center pedestal next to the Flight Spoiler Control Lever. The ground
spoiler system can be armed either automatically or manually as follows:
FLIGHT CONTROLS
For Training Purposes Only
Sept 04
10-19
P I LOT T R A I N I N G GU I D E
Ground Spoilers Arming Logic
Figure 10-11
P604_10_018
Automatic Arming
• GND SPOILERS Switch in the AUTO
position, and
• L and R Thrust Min Takeoff Setting,
and
• Wheel Speed > 16 kts
>
Manual Arming
　
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