Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

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Page 8-7
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 8
LANDING GEAR
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
RETRACTION and EXTENSION (Figure 2)
With the weight of the airplane off the wheels, selecting LANDING GEAR up allows main hydraulic
system pressure into the gear up pipelines. This pressure operates hydraulic jacks, one on each main
gear, and one on the nose gear. Additionally, main pressure is routed via sequence valves and reversing
valves to operate the two main gear wheel well door actuators.
Retraction sequence is as follows:
• Main gear wheel well doors open.
• Nosewheel steering isolated (nose wheel self-centers).
• Nose gear doors open.
• Nose gear locks up and doors shut.
• Main gear locks up.
• Wheel well doors shut and lock.
Subsequent LANDING GEAR down selection diverts main hydraulic system pressure to the gear down
pipelines.
Extension sequence is as follows:
• Main and nose gears unlock and doors open.
• Main and nose gears lock down.
• Main gear wheel well doors shut but do not lock up.
• Nose gear doors shut.
• Nosewheel steering reconnects.
Main system pressure is dumped when the auxiliary hydraulic system is used to lower the landing gear.
In this case, the wheel well doors are pushed open by the extending main gear and remain open with
the gear locked down.