Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов, Страница: 147 / 923

Page 5-6
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 5
HYDRAULICS
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
Wheel Brakes Emergency Path
Main system pressure is distributed through a check valve to the emergency brake accumulator and
the emergency brake reducing valve.
Should the main system pressure fail, the check valve retains the pressure stored in the emergency
brakes accumulator. For details of the number of brake applications available using the fluid from the
accumulator, refer to Sub-section 8 LANDING GEAR.
Low pressure (below 2250 psi) in the path or accumulator is indicated by the illumination of the EMRG
BRK LO PRESS annunciator on the main MWS panel.
Accumulators
Three piston-type accumulators, each installed with a pressure indicator and a gas charging valve, are
located in the rear equipment bay. The piston separates charges of gas from the hydraulic fluid.
With no hydraulic pressure in the system, the main system and the emergency brake accumulators are
initially charged with nitrogen at 1000 psi.
The initial charge for the thrust reverser accumulator is 1500 psi.
NON-MAINTAINED PRESSURE PATHS
The landing gear, flaps, airbrakes and nose wheel steering paths are directly fed with system pressure
with no provision to cover delivery pressure failure.