Gulfstream G550, Руководство по эксплуатации

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Monitor and Warning System (MWS) in order to generate CAS messages in the
event of a malfunction, and to format the graphic display of spoiler position on the
Flight Controls 2/3 synoptic page.
Two additional contact switches, one on each wing, are closed when the spoilers
are flush with the wing surface. The switches, located on the aft wing beam
provide position signals to the MAUs (left spoiler to MAU #1, right spoiler to MAU
#2) confirming that the spoilers are stowed.
If a malfunction of the spoiler system occurs, a single pushbutton, labelled
SPOILER CONTROL, located just forward of the speed brake handle can be used
to deactivate the spoilers. Depressing the pushbutton will illuminate the amber
OFF legend within the button and close two (left and right) spoiler control valves
located in the aft wing to fuselage fairing, bypassing left and right system
hydraulic pressure to the spoiler actuators.
2. Description of Subsystems, Units and Components:
A. Speed Brake:
All six spoiler panels will deploy upward from the wing surface in response
to manual commands from the speed brake handle on the cockpit center
console, shown in Figure 16. An internal light, powered by the right
essential DC bus, will illuminate the speed brake handle as it is moved aft
from the stowed position. The speed brake handle is connected by wire
cables and linkages to the ground spoiler hydraulic actuators that position
the inboard spoiler panels on each wing. The ground spoiler hydraulic
actuators are in turn mechanically linked to the flight spoiler actuators on
each wing that position the middle and outboard spoiler panels. The
amount of spoiler panel deflection is dependent upon the position of the
speed brake handle. The handle may be moved to any range from the
retract position to fully extended position with no detents in the handle
range. At the fully extended position, the two inboard spoilers will deploy to
thirty degrees, plus or minus one degree (30°
±
1°) and the two outboard
spoilers on each wing will deploy to thirty degrees, plus or minus four
degrees (30°
±
4°). The difference in tolerances from the thirty degree (30°)
full setting is due to the rigging of the linkages between the ground and
flight spoiler actuators.
The position of the SPEED BRAKE handle is monitored by an Input /
Output (I/O) module in MAU #2. When the handle is out of the retract
position, the I/O module communicates with the MWS to generate a blue
“Speed Brake Extended” advisory CAS message. If the power levers are
positioned forward of the idle position with the speed brakes extended, an
amber “Speed Brake Extended” caution CAS message is displayed as a
reminder to the flight crew.
NOTE:
Rapid descents using the speed brake with the power
levers at idle produce high closure rates with the
desired or assigned altitude. If not recognized early,
the recovery response is often to add power to slow
the descent rate without first retracting the speed
brakes.
Additionally, if the flight crew commences a roll command to the ailerons
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS
2A-27-00
Page 71
August 14/03
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