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FOR TRAINING PURPOSES ONLY
HAWKER 800 XP
PILOT TRAINING MANUAL
FlightSafety
international
RAM AIR
Ram air from the dorsal air intake is used pri-
marily as a cooling medium for the heat ex-
changer, but it can also be introduced into an
unpressurized cabin for ventilation purposes.
The cabin supply is ducted from the ram-air
intake and fed into the cabin through an elec-
trically operated ram-air valve and a nonreturn
valve, and into the flood flow duct. The ram-
air valve is controlled by a microswitch which
operates when the DUMP VALVE lever is se-
lected fully OPEN.
The ram air passes through the CAU heat ex-
changer assisted by a fan driven by the CAU
turbine, and is ducted to atmosphere through
a grille in the aircraft skin.
If the intake becomes obstructed, a spring-
loaded door in the intake duct opens inwards to
permit air from the rear equipment bay to enter
the intake and supply the CAU heat exchanger.
REAR EQUIPMENT BAY
VENTILATION
A tapping is taken from the dorsal fin air in-
take to provide an air supply for rear equip-
ment bay ventilation. There are no controls or
indications for this supply.
GROUND AIR CONDITIONING
Ground air conditioning can be supplied by the
auxiliary power unit (APU). The APU air sup-
ply is fed through a shutoff valve and a non-
r e t u r n v a l v e i n t o t h e m a i n s u p p l y d u c t
downstream of the pressure regulator and shut-
off valve (PRSOV). APU air is controlled by
the APU AIR VLV OPEN–CLOSE switch on
the flight compartment roof panel.
ELECTRICAL POWER
SOURCES
PE bus bar
• Flight deck heat valve
• HP air overheat warning
• HP bleed on–off valve
• Main air valves 1 and 2
• Cabin temperature (manual)
• Duct overheat detect
PS1 bus bar
• temperature indicator
PS2 bus bar
• Cabin temperature indicator
• Cabin temperature (auto)
• Cabin temperature sensor
LIMITATIONS
There are no limitations imposed on the air-
conditioning system.
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