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 | 72
FOR SIMULATION USE ONLY – NOT A TRAINING AID
COCKPIT AND AVIONICS COOLING SYSTEM
Cockpit cooling and avionics cooling is provided by a vapour cycle system, which
includes an engine-driven refrigerant compressor, condenser and blower
assembly, two air conditioner evaporator and blower assemblies, and a bi-level
pressure switch.
The compressor is belt-driven at the front of the engine, just aft of the propeller
spinner base plate. Vapour cycle air conditioning system operation is controlled by
a toggle switch, placarded AIR COND, ON, OFF, located on the environmental control
panel on the forward cockpit right console. When the AIR COND switch is ON, the air
conditioning compressor will be engaged. The air conditioning compressor is also
powered on when the DEFOG switch is ON.
The evaporator blower assembly in each cockpit is controlled by a rheostat,
placarded EVAP BLOWER, on the environmental control panel in each cockpit. The
blower assembly produces up to 350-cubic-feet-per-minute flow at the HI setting.
Power for the evaporator blower fan in each cockpit is provided through a circuit
breaker, placarded EVAP BLWR, located on the generator bus circuit breaker panel
in the front and rear cockpits.
Cooled air is discharged in each cockpit through one eyeball-type outlet mounted
on the centre console and through two outlets on each glare shield.
Power for cockpit cooling system is provided through a circuit breaker, placarded
AIR COND, located on the generator bus circuit breaker panel in the front cockpit.
Cockpit cooling air is available only when the engine is running, the generator is on
line, the generator bus is powered, and either the AIR COND or DEFOG switch is ON.
NOTE
The evaporator blowers will be on anytime the AVIONICS MASTER switch is
ON.
A bi-level pressure switch will interrupt electrical power to the compressor
clutch in the event of abnormally high or low system pressure. This switch is
located at the service panel just forward of the right wing and automatically
resets when tripped.
NOTE
Air conditioner compressor operation has negligible effect on aircraft engine
and field performance. Air conditioning may be on for all take-offs, landings,
and ground operations without affecting aircraft/engine performance.
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