T-45C TS, ADV & IUT ENG-17
OBOGS & ECS/Pressurization System
3.
Safety relief valves: located on cockpit bulkhead
Overlay 1
Discharge Valves
4.
Canopy seal: cemented to the seal retaining
channel which surrounds the canopy
Overlay 2
Safety Relief Valve
C.
Avionics equipment cooling system--major components
1.
Pressure control valve: located on fwd cockpit bulk-
head behind instrument panel
2.
Discharge valves (2): one collocated with the
pressure control valve, the other aft cockpit on
bulkhead behind seat
VII. ECS operating characteristics 1.4.15.2.1
Sg 5, fr 2
Lesson Organization
A.
Air conditioning system: the ECS system taps air from
a fifth-stage bleed air port. Airflow through the air
OBOGS/SYSTEM
conditioning system is controlled by a solenoid-operated
*
Major OBOGS components
main pressure regulator and shutoff valve (MPRSOV)
*
OBOGS operating characteristics
*
OBOGS controls, switches, and indicators
*
OBOGS operational check requirements
*
OBOGS aircraft interfaces
1.
MPRSOV
*
Major ECS components
ECS operating characteristics
*
*
ECS controls, switches, and indicators
*
ECS aircraft interfaces
a.
Divides airflow into two separate paths
Sg 5, fr 3 (11 overlays)
(1) Cold airflow path directs air through the air
Fig 2: Environmental
conditioning system for cooling
Control System
(2) Hot airflow path
Overlay 1
MPRSOV
(a) Air conditioning system bypassed
(b) Amount of air bypassed is varied by
cockpit temperature control knob
setting
Overlay 2
2.
Primary heat exchanger
Primary Heat
Exchanger
a.
Receives bleed air from fifth-stage engine
compressor ECS port
b.
Reduces temperature of engine compressor
bleed air before passing it to cold air unit (CAU)
Page 17-14
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