T-45C TS, ADV & IUT ENG-17
OBOGS & ECS/Pressurization System
NOTE: Closing the canopy diverts ECS air from
Sg 5, fr 19
avionics cooling to the defog vents.
AV HOT Caution Light
3.
The AV HOT caution light only operates on the
ground and will illuminate if the air temperature in
the avionics cooling ducts exceeds 67 degrees C
(153 degrees F)
VIII. ECS controls, switches and indicators 1.4.15.3
A.
Air conditioning system
Sg 6, fr 2
Lesson Organization
1.
Air conditioning control panel (fwd cockpit only)
OBOGS/SYSTEM
a.
Cockpit air conditioning knob
*
Major OBOGS components
*
OBOGS operating characteristics
*
OBOGS controls, switches, and indicators
*
OBOGS operational check requirements
(1) OFF: energizes solenoid to close main
*
OBOGS aircraft interfaces
*
Major ECS components
pressure regulating and shutoff valve
*
ECS operating characteristics
ECS controls, switches, and
*
(MPRSOV). Ram air ventilation is
indicators
*
ECS aircraft interfaces
automatically activated
Sg 6, fr 3
(2) NORMAL: opens MPRSOV and IPRSOV
Air Conditioning
Control Panel
(if landing gear extended) to provide air
conditioning and pressurization by directing
approximately 60% of the airflow to the
crew ventilation ducts and 40% to defog
ducts
(3) DEFOG: Diverts approximately 60% of the
airflow to the windshield and canopy defog
ducts and 40% to crew ventilation ducts
Overlay 1
Air Conditioning
Control Knob
(4) MAX DEFOG: Opens max defog valve to
allow additional supply of hot air mixing with
Overlay 2
cold airflow
Cockpit Temperature
Control Knob
b.
Cockpit temperature control knob
(1) AUTO: cockpit temperature automatically
controlled by positioning the knob toward
COOL or WARM position to maintain
desired cockpit temperature setting
Page 17-18
Change 7 (9-98)
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