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From the FAA library

  • Glossary

    Air cooling. The removal of unwanted heat from an aircraft engine by transferring the heat directly into the air flowing over the engine components. Air/fuel mixture ratio. The ratio of the weight of the air to that of the fuel ... cylinders of an engine. Air impingement starter. A turbine engine starter that basically consists of a nozzle that blows a stream of compressed air against the turbine blades to rotate the compressor for starting the engine. Air-oil separator…

  • Chapter 6: Lubrication & Cooling Systems › Turbine Engine Lubrication Systems

    Turbine Engine Lubrication Systems Both wet- and dry-sump lubrication systems are used in gas turbine engines. Wet-sump engines store the lubricating oil in the engine proper, while dry-sump engines utilize an external tank mounted on the engine ... somewhere in the aircraft structure near the engine, similar to reciprocating piston engines mentioned earlier. Turbine engine’s oil systems can also be classified as a pressure relief system that maintains a somewhat constant pressure: the full flow type…

  • Chapter 16: Cabin Environmental Control Systems › Air Cycle Air Conditioning › Component Operation

    which opens, closes, and modulates. It is manually actuated from the flight deck and automatically responds to supply and air cycle system parameter inputs. Refrigeration Turbine Unit or Air Cycle Machine & Secondary Heat Exchanger The heart of the air cycle ... air conditioning system is the refrigeration turbine unit, also known as the air cycle machine (ACM). It is comprised of a compressor that is driven by a turbine on a common shaft. System air flows from the primary heat exchanger…