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Copyright © 2020
Original Release
ATA 21‐00‐60
Page | 10
DESCRIPTION AND OPERATION
2. SYSTEM DESCRIPTION AND OPERATION
2.1. General:
2.1.1. The air conditioning system installed on the Pilatus PC12 M19 Aircraft is not considered a
primary flight system. However, an air conditioning system does perform the important
function of providing passenger and flight crew comfort during aircraft movement on the
ground and while in flight. Aircraft air conditioning systems not only provide effective
passenger cooling, but must also maintain a high level of reliability to minimize aircraft
downtime due to unscheduled repairs.
2.1.2. In order to ensure component reliability and achieve a long service life for which the
system is designed, periodic inspection and preventive maintenance must be performed.
Failure to complete periodic inspections, service, or maintenance schedules may reduce
product life and potentially void manufacturer’s warranty.
2.1.3. Inspections, servicing, and/or maintenance schedules are presented in the following
sections. This will ensure component and/or system reliability and performance are
maintained when performed at the specified intervals.
WARNING
: SERVICE TECHNICIANS ARE ADVISED TO OBSERVE STANDARD SAFETY
PRECAUTIONS, SUCH AS WEARING PERSONAL SAFETY GEAR, TO PREVENT INJURY WHILE
PERFORMING SERVICE TO THE UNIT. LIQUID REFRIGERANT CAN CAUSE FROSTBITE AND/OR
BLINDNESS.
WARNING
: PROPER VENTILATION IS REQUIRED. KEEP REFRIGERANTS AND OILS AWAY FROM
OPEN FLAMES. REFRIGERANTS CAN PRODUCE POISONOUS GASSES IN THE PRESENCE OF A
FLAME. WORK IN A WELL VENTILATED AREA AND AVOID BREATHING REFRIGERANT /LUBRICANT
VAPOR MIST IF ACCIDENTAL DISCHARGE OCCURS.
WARNING
: AVOID USE OF COMPRESSED AIR. DO NOT INTRODUCE COMPRESSED AIR OR
OXYGEN INTO AN AIR CONDITIONING SYSTEM OR REFRIGERANT CONTAINER. R-134A IN THE
PRESENCE OF AIR OR OXYGEN ABOVE ATMOSPHERIC PRESSURE MAY FORM A COMBUSTIBLE
MIXTURE.
2.1.4. Do not discharge R-134A refrigerant into the atmosphere. Although its ozone depletion
potential is zero, it can have an effect on global warming. In the United States recovery
and recycling are mandated by the Clean Air Act.
