T-45A UJPT, E2-C2, ADV, & IUT Eng-17
ECS/Pressurization System & OBOGS
(1) Cold airflow path directs air
through the air conditioning
system for cooling
(2) Hot airflow path
(a) Air conditioning system
bypassed
(b) Amount of air bypassed is
varied by cockpit temperature
control knob setting
2.
Inducer pressure regulator and shutoff
Overlay 2
valve (IPRSOV): controls airflow to the
IPRSOV
inducers
a.
When the landing gear is extended,
cooling air is inducted through each
heat exchanger by a cooling air jet
pump (inducer)
b.
When either the landing gear is raised
or the cockpit air conditioning system
is switched off, the inducers will shut
off
3.
Primary heat exchanger
Overlay 3
Primary Heat Exchanger
a.
Receives bleed air from fifth-stage
engine compressor ECS port
b.
Reduces temperature of engine
compressor bleed air before passing it
to cold air unit (CAU)
4.
CAU compressor: compresses bleed air
Overlay 4
CAU Compressor
received from primary heat exchanger
Overlay 5
5.
Secondary heat exchanger: dissipates
Secondary Heat Exchanger
heat gained during compression by CAU
compressor
(8-03) Original
Page 17-5
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