T-45C TS, ADV & IUT ENG-17
OBOGS & ECS/Pressurization System
G.
Ejection seat (oxygen/communications hose): both
cockpits
H.
Pilots personal gear
'
1.
Chest-mounted oxygen regulator
Sg 1, fr 9
Pilot Services Panel
2.
Oxygen mask
3.
Anti-g suit
I.
Pilot services panel: located left console, both cockpits
NOTE: The OBOGS/ANTI-G switch is only on the FWD
pilot services panel.
Sg 2, fr 2
II.
OBOGS operating characteristics 1.4.16.2.1
Lesson Organization
A.
Functional description: OBOGS converts engine
OBOGS/SYSTEM
compressor bleed air to oxygen-enriched breathing air at
*
Major OBOGS components
OBOGS operating characteristics
the correct pressure and temperature. It uses fifth stage
*
*
OBOGS controls, switches, and indicators
compressor air from the OBOGS bleed air port.
*
OBOGS operational check requirements
*
OBOGS aircraft interfaces
*
Major ECS components
*
ECS operating characteristics
1.
OBOGS bleed air shutoff valve
*
ECS controls, switches, and indicators
*
ECS aircraft interfaces
a.
Controls supply of engine compressor air
Sg 2, fr 3 (9 overlays)
required to operate OBOGS
Fig 1: OBOGS Flow
b.
Controlled by temperature switch
Overlay 1
OBOGS Bleed Air
c.
Receives logic control signals from OBOGS/
Shutoff Valve
ANTI-G switch and overheat temperature
sensor
d.
Directs bleed air to heat exchanger
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
Page 17-4
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