The accessory section of a gas turbine engine performs several essential functions. The primary function is to provide space for the mounting of accessories necessary for operation and control of the engine. Generally, it also includes accessories concerned with the aircraft, such as electric generators and hydraulic pumps. Secondary functions include acting as an oil … Read more
In reciprocating aircraft engines, bearings support rotating components while minimizing friction, wear, and power loss. They maintain precise alignment of shafts and moving parts under radial and thrust loads, ensuring smooth and reliable engine operation. Proper bearing design and lubrication are critical for durability, efficiency, and overall powerplant performance. A bearing is any surface which … Read more
Accurate magneto-to-engine timing is essential for proper ignition system operation and engine performance. Several timing references and tools are used to establish the correct crankshaft position and determine the exact point at which the magneto breaker points open. These include built-in engine timing marks, timing discs, piston position indicators, and timing lights. Built-In Engine Timing … Read more
Aircraft propellers can be classified according to their position relative to the engine and airframe. The two primary configurations are tractor and pusher propellers. Each arrangement affects airflow, efficiency, maintenance requirements, and susceptibility to foreign object damage. Tractor Propeller Tractor propellers are those mounted on the upstream end of a drive shaft in front of … Read more
In modern aircraft engines, piston rings are critical for sealing combustion gases, controlling oil consumption, and maintaining engine efficiency. Advanced materials and precise design ensure longevity and reliable operation under high temperature and pressure. The piston rings prevent leakage of gas pressure from the combustion chamber and reduce to a minimum the seepage of oil … Read more
Thermal efficiency is a prime factor in gas turbine performance. It is the ratio of net work produced by the engine to the chemical energy supplied in the form of fuel. The three most important factors affecting the thermal efficiency are turbine inlet temperature, compression ratio, and the component efficiencies of the compressor and turbine. … Read more
In modern reciprocating aircraft engines, the piston is a critical component that converts combustion pressure into mechanical motion. Operating under extreme temperatures and pressures, it must be lightweight yet strong enough to withstand continuous thermal and mechanical stress. Advances in aluminum alloy design, cam-ground shaping, and improved ring configurations enhance durability, efficiency, and engine performance. … Read more
Jet airplanes have high kinetic energy during the landing roll because of weight and speed. This energy is difficult to dissipate because a jet airplane has low drag with the nose wheel on the ground, and the engines continue to produce forward thrust with the power levers at idle. While wheel brakes normally can cope, … Read more
The air entrance is designed to conduct incoming air to the compressor with a minimum energy loss resulting from drag or ram pressure loss; that is, the flow of air into the compressor should be free of turbulence to achieve maximum operating efficiency. Proper inlet design contributes materially to aircraft performance by increasing the ratio … Read more
The oil pressure branch of the engine lubrication system is pressurized by a gear-type pressure pump located in the oil pump and accessory drive housing. [Figure] The pressure pump receives engine oil at its lower (inlet) side and discharges pressurized oil to an oil filter located on the housing. From the oil filter, which is … Read more
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Aero Guide provides structured aviation study materials, technical explanations, and educational resources based on FAA handbooks and other aviation references. Explore aviation fundamentals, aircraft systems, airframe structures, powerplant systems, weight and balance, and more to support your aviation learning journey.
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