T-45A UJPT, E2-C2, ADV, & IUT Eng-17
ECS/Pressurization System & OBOGS
2.
Heat exchanger
Overlay 2
Heat Exchanger
a.
Receives bleed air from bleed-air
shutoff valve
b.
Reduces temperature of bleed air to
level compatible with oxygen
concentrator for optimum performance
c.
Pulls cool ambient (cabin discharge) air
across core to absorb heat before being
exhausted overboard through diffuser
duct
d.
Some engine compressor bleed air is
directed through the filtered ejector
nozzle in the heat exchanger and
exhausted through the mixer/diffuser
duct. This action creates suction to pull
compartment air across the heat
exchanger
e.
Routes cooled air to overheat
temperature sensor
3.
Overheat temperature switch/sensor
Overlay 3
Overheat Temperature
Switch/Sensor
a.
Monitors bleed-air temperature from
heat exchanger
b.
When switch/sensor detects
temperature greater than
250 degrees F, it provides signal to
OXYGEN warning light on warning/
caution panel (WCP)
NOTE: 240 degrees +/- 10; may allow
pilot to reset cockpit switch when cooled
down.
4.
Oxygen concentrator
Overlay 4
Oxygen Concentrator
a.
Receives cooled air from the heat
exchanger
Page 17-14
(8-03) Original
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