T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
c.
OBOGS FLOW selector: enables/
disables OBOGS system in that
cockpit
2.
Oxygen monitor (fwd cockpit only):
mounted on bulkhead above pilot services
panel, enables oxygen monitor BIT
a.
On BUNO 165057 and up and BUNO
163600 through 165056 after AFC-
098, a solid state oxygen monitor is
used
3.
OBOGS BIT button - when pressed and
held, activates the OBOGS internal test
and is primarily used by maintenance
personnel
4.
OXYGEN warning light: indicates OBOGS
failure
a.
Oxygen monitor senses low oxygen
concentration
b.
OBOGS bleed air temperature
exceeds 250 degrees F
c.
OBOGS BIT fails (light still illuminated
after 60 seconds)
d.
OBOGS/ANTI-G switch OFF
NOTE: A bleed air overtemperature of
more than 250 degrees F at any
altitude, or a low oxygen concentration
above 10,800 ft MSL deenergizes the
OBOGS/ANTI-G switch which closes
the bleed air shutoff valve. Altitude
shutoff only applies to 163600 through
163646.
Page 26-64
(8-03) Original
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