Gulfstream IV - Flight Power Shutoff System

• 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.
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
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-27-00
Page 73
January 31/02
Revision 6