I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 67
FOR SIMULATION USE ONLY ā NOT A TRAINING AID
ENVIRONMENTAL CONTROL SYSTEM (ECS)
The environmental control system provides automatic temperature and
pressurization control. Heating and pressurization are provided by conditioned
engine bleed air.
Cockpit cooling is provided by a vapour cycle system with an engine-driven
compressor.
Fresh air ventilation is available for ground operations and non-pressurized flight.
A full set of environmental controls are located in the front cockpit right side
console.
Power for the environmental control panel is provided through a circuit breaker,
placarded CKPT TEMP, located on the generator bus circuit breaker panel in the
front cockpit.
BLEED AIR SUPPLY SYSTEM
Engine bleed air is utilized for the canopy pressurization seal, anti-G system,
cockpit heating and defogging, pressurization, and on-board oxygen generation
system (OBOGS).
Bleed air is tapped from the engine compressor section at the left and right P3
ports. All bleed air supporting OBOGS, anti-G, and the canopy pressurization seal
must first pass through a heat exchanger assembly.
This assembly is divided into two sections. One section supports cooling for anti-G,
canopy seal, and OBOGS. The other section is used for all other ECS functions.
Cooling air for the heat exchanger is supplied by two sources. For ground
operations, a blower supplies the necessary cooling air flow. With weight off the
landing gear, electrical power to the blower is terminated and ram air through the
cooling air inlet is ducted to the heat exchanger. Flappers in the heat exchanger
inlet duct divert the airflow, depending on whether the cooling air is blower or ram
air supplied.
Bleed air from the left side P3 port is used for the OBOGS. The left side P3 bleed air
is controlled using the supply lever on the oxygen regulator in each cockpit.
Bleed air from the right side P3 port is used for canopy seal, anti-G,
heating/defogging, and pressurization. To prevent right side P3 bleed air from
entering the cockpit, both the BLEED AIR INFLOW switch on the environmental
control panel and the DEFOG switch on the centre console must be in the OFF
position. These two switches control the position of the bi-level flow control and
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