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gear inboard doors and disengage the down-
locks. The gear retracts, the final movement of
the actuators engaging the uplocks. The main
gear inboard doors hydraulically close and lock;
the nose gear doors are mechanically closed.
Normal Extension
Placing the LANDING GEAR lever down
reroutes flow through the selector valve, di-
recting pressure to unlock the main gear and
inboard doors and to unlock the nose gear.
The gear extends and the last movement of the
actuators locks the main gear stay and the
nose gear drag brace. The main gear inboard
doors close, the nose gear doors close, and
the aft door remains open.
Emergency Extension
The system is prepared for use by firmly
pulling a red AUX HYD SYSTEM lever.
Pulling the handle:
• Closes an on-off valve (normally open
during main system operation to relieve
fluid seepage)
• Operates a dump valve to isolate any
main system pressure, and to intercon-
nect the normal up and down pressure
lines of the main and nose gear actua-
tors with the main system return line
• Moves a balk clear of the handpump op-
erating handle socket
The AUX HYD SYSTEM lever is held in the
selected position by a spring.
An auxiliary hydraulic handpump is provided
for in-flight use only. The handpump operat-
ing handle is removable and is normally
stowed. Inserting the handle into the hand-
pump socket permits pump operation.
Operation of the handpump draws fluid from
the auxiliary tank. The pressurized fluid is
delivered through a check valve and shuttle
valves to the down side of the main and nose
gear actuators, and to the flap control unit.
NOTE
Shortly after emergency extension
begins, handpump resistance de-
creases (when the landing gear up-
locks release) and the AUX HYD
LO LEVEL annunciator illuminates
(all colored annunciators are shown
in Appendix B). Continued hand-
pump operation locks the gear down
and, after appropriate selection,
achieves the required flap setting.
Following an emergency extension
of the landing gear, the AUX HYD
SYSTEM lever must not be reset.
Proper positioning of the lever and
the auxiliary handpump socket must
be accomplished prior to flight to
assure gear retraction.
Emergency extension is not predicated on the
LANDING GEAR lever being in the down position.
NOTE
With the main system functioning nor-
mally, pulling the AUX HYD SYS-
TEM lever has no effect on flaps
operation. If an emergency extension
is selected to demonstrate the system,
the flaps will be operated by main sys-
tem pressure.
When operating the auxiliary system
to lower the landing gear, the hand
pump action must be continued, after
three greens are achieved, until posi-
tive resistance is felt to make sure the
landing gear is down and locked.
14-9
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
CAUTION
Содержание 800 XP
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