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inboard to outboard): a ground spoiler, an inboard flight spoiler and an outboard
flight spoiler. The spoilers are manually and electrically controlled, hydraulically
powered, and mechanically actuated. They are hinged to open forward when
extended and close aft when retracted. Four hydraulic actuators convert hydraulic
pressure to a linear mechanical force to position the spoilers.
Spoiler panel function and position depends upon the control input. Moving the
SPEED BRAKE handle to the extend position extends all six spoiler panels
simultaneously to function as speed brakes. Rotating the control wheel from the
neutral position extends the inboard and outboard spoiler panels on the same
wing as the raised aileron, functioning as flight spoilers to assist with roll control.
When armed, all six spoiler panels extend automatically extend on touchdown to
dump lift and increase braking effectiveness, functioning as ground spoilers.
Panel function and position is summarized in the following table:
INPUT CONDITION PANEL POSITION
Maximum Aileron, No Speed Brakes Two Down-Wing Flight Spoilers Extended
23°, All Other Panels Retracted
Maximum Speed Brakes, No Aileron All Six Panels Extended 26°
Maximum Speed Brakes, Maximum
Aileron
Two Down-Wing Flight Spoilers Extended
55°, Two Ground Spoilers Extended 26°,
Two Up-Wing Flight Spoilers Extended
26°,
Automatic Ground Spoilers All Panels Extended 55°
The spoiler system is composed of the following subsystems, units and
components:
• Flight Spoiler System
• Speed Brake System
• Ground Spoiler System
• Flight Power Shutoff System
2. Description of Subsystems, Units and Components:
A. Flight Spoiler System:
(See Figure 25.)
Flight spoilers are incorporated into the roll flight control system to improve
aircraft roll response. Spoiler travel varies in proportion to the degree of roll
input. The flight spoiler system is solely a hydraulically powered system,
thus reversion to manual control is not possible.
As the aileron control system commands an aileron to deflect upward, a
mixing linkage between the aileron and flight spoiler control systems
transmits an extend command to the flight spoiler actuator servo control
valve. The servo control valve then shifts to direct pressure to the flight
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 67
October 11/02
Revision 8
spoiler actuator. This allows the two outboard spoiler panels on the same
side as the raised aileron to extend commensurate with the amount of roll
input, up to a maximum of 23 ±2°. The opposite spoilers remain flush to the
wing as that aileron travels downward.
If the speed brakes are extended, the flight spoilers may extend up to a
maximum of 55 +4/-3°. The opposite spoilers remain in the position
commanded as speed brakes.
B. Speed Brake System:
(See Figure 23 and Figure 25.)
The speed brake system provides a method for manual symmetrical
deployment of all six spoiler panels in flight to decrease airspeed and
increase descent rate. They may also be manually extended on the ground
to increase braking effectiveness, should the ground spoilers not
automatically extend upon landing or an aborted takeoff. This is
accomplished by mechanical control of the left and right flight spoiler
actuators through the use of the SPEED BRAKE handle located on the
cockpit center pedestal. The speed brake system is solely a hydraulically
powered system, thus reversion to manual control is not possible.
Moving the SPEED BRAKE handle out of the RETRACT detent provides
simultaneous mechanical input to the left and right flight spoiler mixing
linkages. Each mixing linkage then shifts the associated flight spoiler
actuator servo control valve to the extend position. The servo control valve
then directs Combined and Flight hydraulic system pressure to the actuator
piston. The pistons extends and the attached mechanical linkage drives all
six spoiler panels to a position commensurate with SPEED BRAKE handle
position. Speed brake position is infinitely variable between fully retracted
(0°) and fully extended (26 ±2°), depending on handle position.
With speed brakes extended, rotation of the control wheel repositions the
mechanical linkage between the aileron and flight spoiler control
mechanisms. Movement in either direction will further extend the outboard
two (inboard and outboard flight spoiler) panels on the side of the raised
aileron, up to a maximum of 55 +4/-3°. These panels will return to their
original speed-brakes-extended position when the control wheel is returned
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湾流4操作手册 Gulfstream IV Operating Manual 2(25)
