Pneumatic Systems
Citation Bravo
Developed for Training Purposes
5K-13
September 2005
Air
Conditioning
System
Air Cycle Machine
Conditioned air is the result of bleed
air routed through the air cycle
machine (ACM). Overhead and
under-floor ducting in the cabin and
cockpit distribute the conditioned air.
The ACM
(Figure 5K-6)
utilizes
engine bleed air received from either
the flow control shutoff valves or the
ground shutoff valve to provide con-
ditioned air to the cabin. The ACM is
on the right side of the forward tail-
cone. Components include a turbine
and compressor, a bypass mixing
valve, three heat exchangers joined as
one unit, a fan housing and water
aspirator, and ACM overheat sensors.
The ACM combines a radial flow
compressor and a radial flow turbine
on a common shaft. An extension of
the common shaft drives an external
cooling fan. The fan draws air from
the tailcone across the precooler, pri-
mary, and secondary heat exchang-
ers. Placement of the PRESS
SOURCE
switch determines the
source of the bleed air.
The heat exchangers cool the air
flowing into the compressor and tur-
bine. The cooling air passing across
the heat exchangers extracts the heat
and exhausts overboard through a
vent on the under side of the tail-
cone. The ACM compressor com-
presses the bleed air from the
precooler and primary heat
exchanger. The air then passes to the
secondary heat exchanger and into
the ACM turbine where the air
expands rapidly to produce cold air.
The bypass mixing valve controls air
temperature by modulating the
amount of hot bleed air that bypasses
the ACM and mixes directly with
conditioned air. The bypass valve
position depends on the TEMPERA-
TURE CONTROL switch selection.
A small portion of bleed air from the
heat exchanger routes to the aspira-
tor of the fan housing. Here the high
velocity of the air creates a vacuum
on the tube leading from the water
separator. This removes water col-
lected by the water separator. The
HEAT EXCHANGER
COOLING AIR OUT
THROUGH EXHAUST
VENT
BLEEDAIR IN
AIR OUT
TO CABIN
HEAT
EXCHANGER
COOLING
AIR IN
PRIMARY STAGE
TO HEAT EXCHANGER
AND COMPRESSOR
WATER
TUBE
SECONDARY STAGE
OF HEAT EXCHANGER
TO TURBINE
BYPASS
HOT AIR
DUCT
CONDITIONED
AIR DUCT
WATER
SEPARATOR
5K-6
Summary of Contents for Citation Bravo
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