actuators convert hydraulic pressure to a linear mechanical force to position the
spoilers.
2. Description of Subsystems, Units and Components:
A. Flight Spoiler Control System:
The flight spoiler control system assists the ailerons in spoiling lift. As the
ailerons are deployed upward, the outboard two (inboard and outboard
flight spoiler) panels are also deployed on the up-aileron side, up to a
maximum of 47 (±3) degrees corresponding to full up-aileron travel of 11
degrees.
NOTE:
With the control wheel turned fully in one direction and
flight spoilers fully extended on the up-aileron side, the
opposite wing flight spoilers may deploy slightly. This
condition is acceptable.
If the SPOILER CONTROL switch, located on the cockpit center pedestal,
is selected to OFF, hydraulic pressure is inhibited and the flight spoilers will
be inoperative.
B. Ground Spoiler Control System:
The ground spoiler control system provides a method for full and automatic
deployment of all spoiler panels upon aircraft touchdown in order to reduce
lift and increase braking effectiveness on the ground. Also, if takeoff is
aborted, the system provides for automatic deployment of all spoiler
panels. The system is electrically controlled and hydraulically powered.
(1) Operational Logic:
With the GND SPLR switch selected to ARMED, the ground spoiler
control system will extend all six spoiler panels in unison to 55 (±4)
degrees when the following parameters are satisfied:
• L ESS DC bus available to provide power for LMLG WOW.
• R ESS DC bus available to provide power for RMLG WOW
and electrical control for spoilers.
• L SYS (or AUX or PTU) hydraulic pressure available to
provide servo pressure for spoiler control.
• L SYS (or R SYS) hydraulic pressure available to provide
operational pressure to extend spoilers.
• Both power levers retarded to IDLE.
• SPOILER CONTROL switch selected to ON.
• LMLG and RMLG WOW in GROUND mode
OR:
At wheel spinup greater than 47 knots when:
• Flaps position is greater than 22° OR:
• Flaps position is less than 22° and GND SPLR FLAP
OVERRIDE is selected to ON.
(2) NO GND SPLRS Lights:
(See Figure 14.)
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS2A-27-00
Page 36
May 22/01
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