handle is not in the RETRACT detent and the following conditions occur:
• Advancing either power lever above the takeoff power range on the
ground
• Extending the flaps past 22° or extending the landing gear in flight
C. Ground Spoiler System:
(See Figure 22 through Figure 24.)
(1) General:
The ground spoiler system provides the capability for full and
automatic deployment of all six spoiler panels upon aircraft
touchdown in order to dump any remaining lift and increase braking
effectiveness. Also, if takeoff is aborted, the system provides for
automatic deployment of all spoiler panels.
The inboard spoilers on each wing are used as ground spoilers and,
through electrical control, are powered by the Combined or Flight
hydraulic system. Ground spoiler operation is dependent on control
signal pressure being available from the Combined, Utility or
Auxiliary hydraulic system. When the system is armed (GND SPLR
switch selected to ARMED), the ground spoilers extend to 55 +4/-3°
upon touchdown as the power levers are retarded to the ground idle
setting. Movement of the two ground spoiler actuators provides an
input to the two flight spoiler actuators, causing flight spoiler
extension to 55 +4/-3°. These two actions result in all six panels
extending. After rollout is completed, all six spoiler panels are
retracted by selection of the GND SPLR switch to OFF. Switch
selection to OFF also causes a blue GND SPOILER UNARM
advisory message to be displayed on CAS.
NOTE:
The GND SPLR switch is normally selected to ARMED
on lineup before takeoff. If either power lever is
advanced above idle after the spoilers are armed, the
electrical circuit to the primary and secondary
solenoid-operated hydraulic control valves is broken.
The spoilers will remain stowed even though the GND
SPLR switch is selected to ARMED.
If the aircraft is operating on Essential DC bus power only, the
ground spoilers are inoperative, as power for the system is required
from the Main DC bus. If Main DC bus power is not available and the
GND SPLR switch is selected to ARMED, a red NO GND
SPOILERS warning light (windshield center post) illuminates when
the power levers are retarded to ground idle after landing. Since the
ground spoilers are inoperative, no input is made to the flight
spoilers, thus they also do not extend. In this case, the speed brakes
would be extended at the discretion of the flight crew.
The ground spoiler system incorporates two distinct warning
functions. The first warning function occurs only on the ground, and
is activated if the ground/flight spoilers do not automatically extend
upon touchdown. This is annunciated by illumination of the red NO
GND SPOILERS warning light on the windshield center post. The
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 69
January 31/02
Revision 6
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