Hawker 800 XP, Pilot Training Manual

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HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
NOSEWHEEL STEERING
GENERAL
The manually controlled, hydraulically actuated
nosewheel steering system provides deflection
45° right and left of center. A hydraulic actua-
tor (steering jack) provides movement through
mechanical linkage to steer the nosewheels.
OPERATION
Power for the steering system is provided by
the main hydraulic system. Rotation of the
handwheel on the pilot’s console (Figure 14-
8) moves the selector valve of the steering ac-
tuator which directs pressure to turn the
nosewheel appropriately (Figure 14-9). When
the selected position is reached, the nosewheel
steering angle is maintained. A relief valve,
fitted into the actuator hydraulic return line,
reduces the possibility of nosewheel shimmy.
When the nose gear unlocks prior to retraction,
a shutoff valve is mechanically closed, ren-
dering the steering system inoperative.
The steering handwheel must be free
from obstruction during gear lower-
ing, otherwise an unwanted steering
command will be given which may re-
sult in the aircraft veering off the run-
way immediately on touchdown
The reason is, the geometry of the
linkage from the handwheel to the
selector valve causes the handwheel
to rotate while the gear is lowering
or retracting. The handwheel must
be free to turn and to find its neu-
tral position again prior to the gear
locking down.
The quick-release and steering disconnect
pins must be removed prior to towing. Install
the steering disconnect pin, retaining it with
the quick-release pin, for all towing opera-
tions.
WARNING
14-10
FOR TRAINING PURPOSES ONLY
PILOT'S CONSOLE
STEERING
ACTUATOR
TORQUE
LINK
QUICK-RELEASE PIN
STEERING
DISCONNECT PIN
Figure 14-8. Nosewheel Steering System