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SUBTASK 21-00-09-99F-005
1.5
Consumable Products:
PART NUMBER
DESCRIPTION
REMARKS
11602
SEALANT RTV
BLACK
7471
THREAD SEALANT PRIMER
LOCTITE
569
THREAD SEALANT
LOCTITE
RL100H
EMKARATE ESTER REFRIGERANT OIL
Table 2 Consumable Products
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Introduction
Page 12
FEBRUARY 16, 2010
DESCRIPTION AND OPERATION
TASK 21-00-09-99F-802
2.0
R-134a AIR CONDITIONING SYSTEM DESCRIPTION AND OPERATION
SUBTASK 21-00-09-99F-006
2.1
General:
2.1.1
Air conditioning systems installed on aircraft are 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.
Component Maintenance Manual
12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
Fax (405) 382-0737
http://www.enviro-ok.com
EFFECTIVITY: ALL 21-00-09
Introduction
Page 13
FEBRUARY 16, 2010
2.1.5
Refrigerant recovery/recycling service equipment must be approved for use with R-134a refrigerant. Recycling machines must be approved by Underwriters Laboratories (UL) and meet SAE standard J2210 and SAE standard J2099 for refrigerant purity.
SUBTASK 21-00-09-99F-007
2.2
System Description and Operation:
2.2.1
The cabin cooling system installed in the Cessna Model 510 aircraft operates using a closed vapor cycle concept using refrigerant R-134a as the heat absorption media. The R-134a air conditioning system cools the aircraft in a similar manner as systems found in an automobile or home. However, aircraft air conditioning systems contain components which are designed to be light weight, compact, provide high performance, and provide the ability to operate at extreme altitudes and ambient temperatures.
2.2.2
The concept of air conditioning a room, cabin or cockpit is straight forward. Examples of a system are shown in Figures 2 and 3 (refer to Schematic and Wiring Diagrams, Section 4). Refrigerant is the media which absorbs and rejects the room or cabin heat. By continuous recirculation of the warm cabin air, heat is absorbed in the evaporator module(s) and is rejected to the outside through the system condenser. When the system is turned on, the electric motor drives the R-134a compressor at a constant speed and capacity which compresses the R-134a refrigerant gas to a high pressure. The hot, high pressure gas then passes through the condenser coil where it is cooled and condensed into a warm liquid at constant pressure. The warm liquid is then routed into a receiver-dryer container where the liquid and any remaining gas are separated and any moisture is absorbed. The warm, dry liquid is then directed to the evaporator module expansion valve where the high pressure liquid is expanded to a low pressure. The expansion process creates a super cool gas which passes through the evaporator coil and absorbs heat from the warm cabin air passing over the coils. The warm low pressure refrigerant then enters the R-134a compressor where the process starts all over again. In addition to cooling the cabin air, a refrigerant type system also removes a large percentage of the moisture in the air as well as removing dust and pollen particles in the air. Thus, the system conditions the air as well as cooling it. As a safety feature, the unit is also equipped with a binary pressure switch. This switch prevents the unit from operating if the discharge pressure becomes excessively high. The switch also prevents the unit from operating if the internal pressure is very low due to leakage or low ambient temperatures.
　
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