Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

Страница: 102 / 923

Page 2-25
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 2
ENGINES
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
Filter Clogged
If the filter begins to clog, the following events will occur:
• At 6 to 8 psi
∆
p the amber annunciator will illuminate on the MWS.
• At 9 to 12 psi
∆
p the filter bypass valve opens to deliver fuel to the high pressure pump.
The annunciator will remain illuminated for as long as the fuel filter remains clogged.
Fuel Control Unit
The fuel pump-driven FCU contains:
• Fuel Metering Section
• Power Lever Input Pot
• Shutoff Valve
• Outlet Pressurizing Valve
• Ultimate Overspeed Solenoid
• Mechanical Governor (N
2
)
The mechanical governor functions has two modes:
• An overspeed governor for the HP rotor if the fuel computer is operative.
• A hydro-mechanical control when the fuel computer is inoperative.
An operating fuel computer (DEEC) electrically controls fuel flow scheduling by setting the FCU
metering section pressure drop according to thrust lever and engine inputs. The FCU has two shutoff
valves in series.
The thrust lever actuates one valve and the electronic engine computer actuates the other valve. If the
computer senses an ultimate overspeed condition, the computer closes the shutoff valve, fuel flow
stops, and the engine shuts down.
Inlet Pressure and Temperature Sensor
An inlet pressure and temperature sensor is located on the cowling forward of the fan inlet. The sensor
contains electrical elements for sensing inlet air temperature (Tt
2
) and a pressure tap for sensing inlet
air pressure (Pt
2
). Both inlet parameters are required by the fuel computer and an electrical anti-icing
element is contained in the sensor.