T-45A UJPT, E2-C2, ADV, & IUT Eng-17
ECS/Pressurization System & OBOGS
b.
Filters nitrogen and other contaminants
from cooled engine bleed air,
producing oxygen-enriched air for
pilots
(1) Cooled engine bleed air from heat
Overlay 5
exchanger passes through inlet
Rotary Valve
filter and pressure reducer in the
oxygen concentrator to the rotary
valve.
(2) Rotary valve directs air to one of
Overlay 6
two molecular sieve beds
Molecular Sieves
alternately every five seconds
(3) Sieve bed filters out nitrogen and
Overlay 7
contaminants and directs oxygen-
Internal Plenum
rich air to internal plenum
NOTE: Allows anything the size of
an oxygen molecule or smaller to
pass through, anything larger than
an oxygen molecule is filtered out.
(4) Internal plenum receives oxygen-
rich breathing air from both sieve
beds and directs air to oxygen
plenum
c.
Directs oxygen-rich breathing air to
plenum
5.
Plenum
Overlay 8
Plenum
a.
Receives oxygen from concentrator
b.
Provides a volume of oxygen-enriched
breathing air to meet peak demands
c.
Prevents surges in pilots' oxygen
supply
d.
Equalizes temperature of breathing air
from concentrator to cockpit
(8-03) Original
Page 17-15
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