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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)
• NO GND SPOILERS light is extinguished
• GND SPOILER warning message is not displayed on
CAS
• GND SPOILER UNARM advisory message is
displayed on CAS
(c) Select the GND SPLR switch to ARMED. Verify the following
indications:
• Ground spoilers are extended (visually check)
• NO GND SPOILERS light is extinguished (may flash
momentarily)
• GND SPOILER warning message is not displayed on
CAS
• GND SPOILER UNARM advisory message is not
displayed on CAS
(d) Advance the left power lever out of idle. (See Note 1.) Verify
the following indications:
• Ground spoilers are stowed (visually check)
• NO GND SPOILERS light is extinguished
• GND SPOILER warning message is not displayed on
CAS (may appear momentarily)
(e) Advance the right power lever out of idle.
(f) Retard the left power lever to idle. Verify the following
indications:
• Ground spoilers remain stowed (visually check)
• NO GND SPOILERS light is extinguished
• GND SPOILER warning message is not displayed on
CAS
(g) Select the GND SPLR switch to OFF. Verify the following
indications:
• GND SPOILER UNARM advisory message is
displayed on CAS
(h) Press and hold the GND SPLR TEST switch. (See Notes 2
and 3.) Verify the following indications:
• Ground spoilers remain stowed (visually check)
• NO GND SPOILERS light is illuminated
• GND SPOILER warning message is displayed on CAS
• Both MASTER WARN lights illuminate
• GND SPOILER UNARM advisory message is
OPERATING MANUAL
2A-27-00 PRODUCTION AIRCRAFT SYSTEMS
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October 11/02
Revision 8
displayed on CAS
• GND SPOILER light on SWLP (if installed) is
illuminated
(i) Release the GND SPLR TEST switch. Verify the following
indications:
• Ground spoilers remain stowed (visually check)
• NO GND SPOILERS light is extinguished
• GND SPOILER warning message is not displayed on
CAS
• Both MASTER WARN lights are extinguished
• GND SPOILER UNARM advisory message is
displayed on CAS
• GND SPOILER light on SWLP (if installed) is
extinguished
(j) Retard the right power lever to idle. Verify the following
indications:
• NO GND SPOILERS light is extinguished
• GND SPOILER warning message is not displayed on
CAS
• GND SPOILER UNARM advisory message is
displayed on CAS
NOTE:
(1) When the power lever is advanced, the red GND
SPOILER warning message may be displayed
momentarily and then extinguish. If the message
remains extinguished, continue the test.
(2) The absence of either the NO GND SPOILERS
light or the GND SPOILER message during Step 6 of
the ground spoiler system check, or any incorrect
indication, constitutes an unsuccessful ground spoiler
system check.
(3) The ground spoilers cannot always be observed
from the cockpit. The correct GND SPOILER message
and NO GND SPOILERS light indications are
sufficient for satisfactory preflight functional
verification.
D. Flight Power Shutoff System:
The flight power shutoff valve is a mechanically operated shutoff valve
located between the Combined and Flight hydraulic system pressure
sources and the flight and ground spoiler actuator pressure lines. The
valve consists of two mechanically connected but hydraulically isolated
sections. A controlex cable connects the valve to a FLIGHT POWER SHUT
OFF handle located on the left aft side of the cockpit center pedestal. See
Figure 8.
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 73
October 11/02
Revision 8
Moving the FLIGHT POWER SHUT OFF handle up from its stowed
(horizontal) position to the vertical position mechanically closes the flight
power shutoff valve. With the valve closed, operating pressure is removed
from the spoiler actuators and use of the system is not possible.
In accordance with limitations established in the GIV Airplane Flight
Manual, pulling the FLIGHT POWER SHUTOFF handle with speed brakes
extended is prohibited.
The resultant advantage of the flight power shutoff provision is the ability to
bypass a malfunctioning actuator (such as would be the need in the
unlikely event of an actuator jam) and manually fly the aircraft. Although
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湾流4操作手册 Gulfstream IV Operating Manual 2(28)
