Aviation Mechanic - General, Airframe, and Powerplant › II. Airframe › Task G. Environmental Systems

AM.II.G.S9

Skill

Locate the procedures for servicing a refrigerant (vapor-cycle) system.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - Airframe p. 16-56
Chapter 16: Cabin Environmental Control Systems › Vapor Cycle Air Conditioning › System Servicing
Water is removed from the system by evacuation. Anytime the system refrigerant charge falls below atmospheric pressure, the refrigerant is lost, or the system is opened, it must be evacuated before recharging. Evacuating a vapor cycle air conditioning system ... also known as pumping down the system. A vacuum pump is connected and pressure inside the system is reduced to vaporize any water that may exist. Continued operation of the vacuum pump draws the water vapor from the system…
Aviation Maintenance Technician Handbook - Airframe p. 16-52
Chapter 16: Cabin Environmental Control Systems › Vapor Cycle Air Conditioning › Vapor Cycle Air Conditioning Servicing Equipment
Figure 16-86. A basic manifold set for servicing a vapor cycle air conditioning system. Figure 16-87. The internal workings of a manifold set with the center fitting isolated (top). Opening a valve connects the center hose to that ... side of the system and the gauge (bottom). Special hoses are attached to the fittings of the manifold valve for servicing the system. The high-pressure charging hose is usually red and attaches to the service valve located…