Hawker Beechcraft Hawker 800XP, Руководство по эксплуатации для пилотов

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Page 2-21
Pilot’s Operating Manual
Revision A1: Nov, 2002
Sub-section 2
ENGINES
Hawker 800XP Pro Line 21
Section III - SYSTEMS DESCRIPTION
Fuel/Oil Cooler
The fuel/oil cooler (oil temperature regulator) uses airplane fuel to maintain the oil at a constant
temperature and consists of a temperature control valve and a heat exchanger. Fuel constantly flows
through the unit and oil only flows through the unit if it is above a set temperature.
If the oil temperature exceeds 99
°
C the control valves open to route the oil through the cooler. From
the fuel/oil cooler, oil then lubricates the fan shaft bearings and the front LP spool bearings.
After travelling to all the main sump areas, oil then drains by gravity to the lowest point of each sump
and is then drawn back to the engine oil reservoir by the scavenge pumps.
Oil Venting
Vent lines interconnect the oil sumps to the oil tank assembly and the breather pressurizing valve. The
breather pressurizing valve provides an ambient vent for the oil system at low altitudes and at high
altitude increases the internal engine vent and tank pressure to ensure proper oil pump operation.
Low Oil Pressure Annunciators
A pressure switch, located in each engine oil supply line, operates the red OIL 1 LO PRESS and OIL 2
LO PRESS annunciators on the MWS.
Normally, engine oil pressure holds the switch open. If the pressure drops below 23 PSI, the switch
closes to complete a circuit which will cause the respective annunciator to illuminate. Once the pressure
exceeds 25 PSI, the switch will open to break the circuit and extinguish the annunciator.
MFD
MFD
PFD
PFD
Copilot Instrument Panel
Pilot Instrument Panel
Center Instrument
Panel
OIL 2
LO PRESS
OIL 1
LO PRESS
and/or