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to neutral.
When speed brakes are extended, a blue SPD BRAKE EXTNDED
advisory message is displayed on the Crew Alerting System (CAS). In
addition, the SPEED BRAKE handle will illuminate blue.
On airplanes SN 1000 through 1472 having ASC 415B and SN 1473 and
subs, an amber SPD BRAKE EXTNDED caution message is displayed on
CAS any time the speed brakes (flight spoilers) are extended with one or
both power levers above idle. Should this message be displayed, the flight
crew normally would either retract the speed brakes or reduce engine
thrust to extinguish the message.
Should the fault warning computer and flight guidance computer disagree
on the position of the speed brakes, a blue SPD BRAKE SWITCH advisory
message is displayed on CAS.
A red ACFT CONFIGURATION warning message will be displayed on
CAS, along with the associated warning tone, whenever the SPEED
BRAKE handle is not in the RETRACT detent and the following conditions
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
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October 11/02
Revision 8
occur:
• Advancing either power lever above 80% HP RPM on the ground
• Extending the flaps to DOWN (39°) or extending the landing gear in
flight
For aircraft having a Standby Warning Lights Panel (SWLP) installed, a red
ACFT CONFIG light will be illuminated whenever the SPEED BRAKE
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
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PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 69
October 11/02
Revision 8
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
second warning function can occur both on the ground and in flight,
and is activated if there is a failure within the ground spoiler system
which might result in inadvertent spoiler extension. This is
annunciated by a red GND SPOILER warning message displayed
on CAS and, if installed, the SWLP.
(2) Hydraulic Operation:
The ground spoiler system requires both control pressure and
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湾流4操作手册 Gulfstream IV Operating Manual 2(26)
