Hawker 800 XP, Pilot Training Manual

Page: 350 / 504

OPERATION
Operation of the auxiliary hand pump in nor-
mally blocked by a balk arm. To prepare the
system for operation, pull the AUX HYD SYS-
TEM lever (Figure 13-7). This action:
• Disengages the balk arm, freeing the
hand pump for operation
• Closes the on-off valve, allowing hand
pump pressure buildup
• Positions the dump valve to block main
system pressure and to connect landing
gear actuators to the reservoir return
Operation of the hand pump will now create
pressure for emergency extension of the land-
ing gear and for flap operation, when selected.
When operating the auxiliary hy-
draulic system to lower the landing
gear, the hand pump action must be
continued, after three greens are
achieved, until positive resistance
is felt to make sure the landing gear
is down and locked.
HYDRAULIC
SUBSYSTEMS
Landing gear, flaps, airbrakes, nosewheel
steering, brakes, stick pusher, and thrust re-
versers are hydraulically powered. The ap-
plication of hydraulic power is presented in
Chapter 14, “Landing Gear and Brakes,” in
Chapter 15, “Flight Controls,” and in Chapter
7, “Powerplant,” for thrust reversers.
ELECTRICAL POWER
SOURCES
PE bus bar
• HYD 1 LO PRESS annunciator
• HYD 2 LO PRESS annunciator
• AUX HYD LOW LEVEL annunciator
• E M E R B R A K E L O W P R E S S U R E
a n n u n c i a t o r
PS2 bus bar
• Main SUPPLY pressure indicator
• HYD OVHT annunciator
CAUTION
Revision 1 13-8
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
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