T-45C TS, ADV & IUT ENG-17
OBOGS & ECS/Pressurization System
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 at any altitude:
(1) Provides signal to OXYGEN warning light
on warning panel
Overlay 4
4.
Oxygen concentrator
Oxygen Concentrator
a.
Receives cooled air from heat exchanger
b.
Filters nitrogen and other contaminants from
cooled engine bleed air, producing oxygen-
enriched air for pilots
Overlay 5
(1) Cooled engine bleed air from heat
Rotary Valve
exchanger passes through inlet filter
and pressure reducer in the oxygen
concentrator to the rotary valve.
Overlay 6
(2) Rotary valve directs air to one of two
Molecular Sieves
molecular sieve beds alternately every
five seconds
(3) Sieve bed filters out nitrogen and
Overlay 7
contaminants and directs oxygen-rich
Internal Plenum
air to internal plenum
Page 17-5
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