T-45C TS, ADV & IUT ENG-17
OBOGS & ECS/Pressurization System
b.
Aft Cockpit
(1) OBOGS FLOW selector - OFF
(2) CABIN pressure altimeter - CHECK
5.
Starting Engine
a.
OBOGS/ANTI-G switch-ON
6.
Poststart
a.
OBOGS pneumatic BIT button - PRESS
Hold until OXYGEN warning light illuminates.
Ensure light goes out 1 minute after releasing
button
b.
Oxygen mask - ON/CONFIRM FLOW
c.
ANTI-G test button - PRESS
B.
Evaluation criteria
1.
When the OBOGS pneumatic test button is pressed,
cockpit air enters oxygen monitor illuminating the
OXYGEN warning light. The OXYGEN warning light
should illuminate within 65 seconds and extinguish
within 1 minute of releasing the button
NOTE: Due to the extreme sensitivity of the
pneumatic BIT mechanism, steady uninterrupted
manual pressure on the BIT button is required to
obtain a satisfactory test.
Sg 11, fr 2
2.
Wearing oxygen mask not required during oxygen
Lesson Organization
test but will speed up testing process
OBOGS/SYSTEM
V.
OBOGS aircraft interfaces 1.4.16.2
*
Major OBOGS components
*
OBOGS operating characteristics
*
OBOGS controls, switches, and indicators
A.
Electrical
*
OBOGS operational check requirements
OBOGS aircraft interfaces
*
*
Major ECS components
*
ECS operating characteristics
1.
28 VDC essential services bus provides power
*
ECS controls, switches, and indicators
*
ECS aircraft interfaces
a.
OBOGS concentrator/monitor
Page 17-11
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