Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

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Page 8-18
Pilot’s Operating Manual
Original Issue: Feb, 2002
Sub-section 8
LANDING GEAR
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
POWER SUPPLIES
DC power distribution is as follows:
PE Busbar
WHEEL BRAKE EMERG annunciators
PS1 Busbar
BRAKES applied pressure indicators
NOSEWHEEL STEERING (Figure 9)
CAUTION:
A STEERING DISCONNECT PIN MUST BE REMOVED BEFORE TOWING THE AIRPLANE.
(Refer to Section 6, Sub-section 1 - GROUND HANDLING)
OPERATION
Hydraulic pressure is provided from the main hydraulic system for operation of the nose wheel steering.
CAUTION:
NOSE WHEEL STEERING IS NOT AVAILABLE WHEN THE MAIN HYDRAULIC PRESSURE IS
LESS THAN 2300 PSI. THE AUXILIARY HYDRAULIC SYSTEM CANNOT POWER THE
STEERING SYSTEM.
When the nose gear is locked down, nose wheel steering is available through a range of 45
°
left and
right of the center line. Steering is controlled from a handwheel located on the left-side console.
Rotation of the handwheel operates the selector valve input via cables and linkage. Movement of the
selector valve directs hydraulic pressure to either extend or retract the steering actuator. The nose gear
is turned in the required direction by the steering actuator.
When the required degree of turn has been reached, feedback through linkage connected to the
landing gear moves the selector valve input to a neutral position. The nose gear stops turning and the
selected angle is maintained. A steering on/off valve is operated by the nose gear mechanical
indication linkage. The on/off valve is only selected on when the nose gear is locked down. After lift-off
the nose gear is centered by the action of cams in the oleo strut.
WARNING: THE STEERING HANDWHEEL MUST BE FREE FROM OBSTRUCTION DURING
GEAR LOWERING. FAILURE TO MAKE SURE THE HANDWHEEL IS FREE TO
MOVE MAY RESULT IN THE AIRPLANE VEERING OFF THE RUNWAY
IMMEDIATELY ON TOUCHDOWN.
The reason the handwheel must be free from obstruction during gear lowering is that 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 neutral position again prior to
the gear locking down.
When the steering on/off valve is selected off, the steering actuator is isolated from the main hydraulic
pressure for the purpose of preventing the gear being turned and striking the wheel bay.