Revision 1.02
7-18
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
ENGINE BLEED AIR AND
VENTILATION
INTRODUCTION
Air is bled from two stages of the engine com-
pressor to provide supplies for (see Figure 7-14):
• Nacelle Inlet Cowl Anti-icing
• Aircraft Services.
Ram air is used to ventilate the area of the
cowling surrounding the engine compressor
stages between the front and rear firewalls.
BLEED AIR
Anti-icing
An ENG ANTICE ON-OFF switch (see Figure
7-15), located on the roof panel ice protection sec-
tion, is provided for each engine. With either or
both switches selected to ON, an ICE PROT SE-
LECTED annunciator on the MWS panel is lit.
Each switch controls a servo-operated anti-
icing on-off valve. When ON is selected, the
following events occur:
• The anti-icing valve deenergizes open
and high pressure air from the HP com-
pressor and is ducted forward to anti-
ice the nacelle inlet cowl.
• Electrical power is supplied to PT2 and
TT2 sensor probe heaters.
• In flight, the engine digital computers
are reset to a schedule that incorporates
a raised idle rpm to compensate for the
effect on thrust.
• The temperature provided by the A panel
windscreen film temperature is uplifted
from the normal setting to ensure ade-
quate anti-icing performance.
ZONE 1
VENTILATION
INLET
ANTI-ICING
ON-OFF VALVE
PRESSURE
SWITCH
UPPER
PANEL
DISTRIBUTION
DUCT
PICCOLO
TUBE
ANTI-ICING
PIPE FROM
COMBUSTION
SECTION
INLET
COWL
ANTI-ICING HOT AIR FLOW
VENTILATION AIR FLOW
FWD COWL
FIREWALL
AFT COWL
FIREWALL
ENGINE
ACCESSORY
SECTION
(ZONE 1)
LOWER
ACCESS
DOOR
THRUST REVERSER
DOORS
FAN EXHAUST DUCT
INNER SKIN
FAN EXHAUST DUCT
OUTER SKIN
ENGINE
COMBUSTION
SECTION ZONE 2
MIXER NOZZLE
Figure 7-14. Engine Air Bleeds and Ventilation
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