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operating pressure. Control pressure, also known as servo
pressure, is normally supplied by the Combined hydraulic system,
but can be supplied by either the Utility or Auxiliary hydraulic
systems. Operating pressure is supplied by the Combined and
Flight hydraulic systems. The ground spoiler system is solely a
hydraulically powered system, thus reversion to manual control is
not possible.
The ground spoiler hydraulic system contains primary and
secondary solenoid-operated hydraulic control valves located in the
main wheel well. Two ground spoiler actuators (one per side) are
located at the inboard ends of the left and right wing rear beam.
During normal operation, Combined and Flight hydraulic system
pressure is supplied through the open flight power shutoff valve to
the retract side of the ground spoiler actuators.
The ground spoiler automatic deployment feature is accomplished
by a common hydraulic signal that overrides any input to the servo
valve through the SPEED BRAKE handle. The override signal is
supplied by Combined (or Utility or Auxiliary) hydraulic pressure to
both actuators through normally-closed solenoid valves. Since the
override signal is common to both the left and right actuators, the
possibility of asymmetrical extension is virtually eliminated.
In the unlikely event that the ground spoilers inadvertently extend
during low-speed flight, the ground spoiler control system will extend
all six spoiler panels in unison to 55 +4/-3°. Should this occur at
higher airspeeds, the panels will “blow back” to an angle that
balances the aerodynamic load against the panels with the force
applied by the actuators.
If both Combined and Flight hydraulic system pressure is lost, a
bypass feature in the actuators allows the spoiler panels to “blow
down” to a trail position.
(3) Operational Logic:
The ground spoiler control system will automatically extend all six
spoiler panels in unison to 55 +4/-3° when the following parameters
are satisfied:
• Main DC bus power is available to provide electrical power
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
Page 70
October 11/02
Revision 8
for the system
• Combined (or Utility or Auxiliary) hydraulic pressure is
available to provide servo pressure for spoiler control
• Combined or Flight hydraulic pressure is available to provide
operational pressure to extend the spoilers
• GND SPLR switch is selected to ARMED
• 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
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 71
October 11/02
Revision 8
of each day. It provides a complete functional check of the automatic
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湾流4操作手册 Gulfstream IV Operating Manual 2(27)
