• Both power levers are retarded to ground idle
• Main landing gear Weight-On-Wheels (WOW) is sensed by
the nutcracker system
• At wheel spinup greater than 57 knots (48 knots for aircraft
with ASC 307 incorporated) when:
• Flaps position is greater than 22° OR:
• Flaps position is less than 22° and the GND SPLR
FLAP ORIDE switch is selected to ON
(4) Ground Spoiler Warning System:
The ground spoiler system is monitored by a warning circuit that will
detect certain in-flight and on-ground malfunctions within the ground
spoiler system.
(a) A red GND SPOILER warning message will be displayed on
CAS and, if installed, the SWLP, should any of the following
events occur while in flight:
• One or both ground spoilers not fully retracted with
SPEED BRAKE handle in RETRACT detent
• Primary solenoid-operated hydraulic control valve
failure with secondary solenoid-operated hydraulic
control valve pressurized
• Secondary solenoid-operated hydraulic control valve
electrically energized
• Failure of the primary solenoid-operated hydraulic
control valve nutcracker relay No. 6
• Failure of the secondary solenoid-operated hydraulic
control valve nutcracker relay No. 1
Additionally, the red GND SPOILER warning message will be
displayed should any of the following events occur while on
the ground:
• Primary solenoid-operated hydraulic control valve
failure with the power levers not in ground idle
• Unlocked ground spoiler with power levers at takeoff
power
(b) A red NO GND SPOILERS warning light, located adjacent to
the pilot’s AOA indexer on the windshield center post, will
illuminate if the ground spoilers do not automatically extend
upon touchdown.
(5) Ground Spoiler System Check:
The following ground spoiler system check should be performed
during the After Starting Engines checklist prior to the first departure
of each day. It provides a complete functional check of the automatic
ground spoiler system and ground spoiler warning system.
(a) Verify the GND SPLR switch is selected to OFF.
(b) Verify left and right power levers are positioned to idle. Verify
the following indications:
• Ground spoilers are stowed (visually check)
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 71
January 31/02
Revision 6
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