BLEED-AIR HEATING
SYSTEM
Air pressure for cabin pressurization, heat-
ing the cabin and cockpit, and for operating
the instr uments, r udder boost, and surface
deice is obtained by bleeding air from the
compressor stage (P
3
) of each engine. When
air is compressed, its temperature increases.
Therefore, the bleed air extracted from the
compressor section of each engine for pres-
surization pur poses is hot. This heat is uti-
lized to war m the cabin.
Engine bleed air is ducted from the engine
to the flow control unit mounted on the f ire-
wall. The bleed air from either engine will
continue to provide adequate air for pres-
surization and heating, and for the deicer
system and instr uments, should one engine
fail. The bleed air and ambient air from the
cowling intake are mixed together by the
flow control units, and are routed aft through
the f irewall along the inboard side of each
nacelle, and inboard to the center section
forward of the main spar.
When the left landing gear safety switch is
in the on-the-g round position, the ambient
air valve (Figure 11-13) in each flow con-
trol unit is closed. Consequently, only bleed
air is delivered to the environmental bleed-
air duct when the air plane is on the g round.
The exclusion of ambient air allows faster
cabin war mup during cold weather opera-
tion. In flight, the ambient air valve is open
when temperature is above 30°F, and ambi-
ent air is mixed with the engine bleed air in
the flow control unit. During war m weather
g round operation, the engine bleed air into
t h e c a b i n c a n b e s h u t o ff by p l a c i n g t h e
KING AIR C90GTi/C90GTx
PILOT TRAINING MANUAL
11-6
FOR TRAINING PURPOSES ONLY
11
AIR
CONDITIONING
Figure 11-12. Cockpit “Eyeball” Outlets
LEGEND
AMBIENT AIR
BLEED AIR
ENGINE
BLEED
AIR
AMBIENT
AIR
AMBIENT AIR
MODULATING VALVE
FIREWALL
PNEUMATIC
THERMOSTAT
AMBIENT
AIR
SHUTOFF
VALVE
BLEED AIR PRESSURE
SHUTOFF VALVE
ENVIRONMENTAL
BLEED AIR FLOW
CONTROL UNIT
ENVIRONMENTAL
BLEED AIR FLOW
CONTROL UNIT
PNEUMATIC
THERMOSTAT
ENGINE BLEED AIR
AMBIENT
AIR
AMBIENT
AIR
SHUTOFF
VALVE
FIREWALL
AMBIENT AIR
MODULATING VALVE
Figure 11-13. Ambient and Bleed Air Flow Forward of Firewalls
Содержание C90GTi
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