T-45A UJPT, E2-C2, ADV, & IUT Eng-17
ECS/Pressurization System & OBOGS
2.
Pressure control valve: maintains cockpit
pressure at predetermined value with
respect to aircraft altitude
3.
Discharge valves: control cockpit
Overlay 1
pressurization by adjusting airflow out of
Discharge Valve Operation
the cockpit in response to control inputs
Overlay 2
from the pressure control valve
Cockpit Pressurization
Overlay 3
4.
Safety relief valve: ensures that positive
Safety Valve Operation
cockpit pressure does not exceed 4.8 psi
and that inward negative cockpit differential
pressure does not exceed 0.5 psi (rapid
descent protection)
C.
Avionics equipment cooling system
1.
While airborne, some of the conditioned
cockpit air exhausted through the
discharge valves passes through the
avionics compartments on its way to being
discharged overboard
2.
On the ground with the canopy open, the
diverter valve directs ECS cooling air from
the canopy defog vents to the avionics
compartments
NOTE: Closing the canopy diverts ECS air
from avionics cooling to the defog vents.
3.
The AVIONICS HOT caution light only
Sg 2, fr 4
operates on the ground and will illuminate
if the air temperature in the avionics
cooling ducts exceeds 67 degrees C
(153 degrees F)
AVIONICS HOT CAUTION LIGHT
Page 17-8
(8-03) Original
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