T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
b.
OBOGS bleed air temperature exceeds
250 degrees F
c.
OBOGS BIT fails
d.
OBOGS/ANTI-G switch OFF
C.
Environmental control system (ECS)
1.
Air conditioning system
a.
Primary heat exchanger
(1) Receives bleed air from fifth-stage engine
Sg 10, fr 19
compressor ECS port
ECS Normal Functions
(2) Reduces temperature of engine
compressor bleed air before passing it
Fig 23: ECS Block
Diagram
to cold air unit (CAU)
b.
CAU: compresses bleed air received from
primary heat exchanger (temperature rises)
c.
Secondary heat exchanger: cools compressed
air before it reaches CAU turbine
d.
CAU turbine: further cools air received from
secondary heat exchanger by expansion
through turbine
e.
Temperature control system: controls final
conditioned air temperature by mixing cold air
from CAU turbine with hot air taken prior to
primary heat exchanger
f.
Cockpit air distribution
(1) Location: cooling ducts in both cockpits,
under left and right canopy rails
(9-98) Original
Page 27-96
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