Mantenimiento de motores de aviacion

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  • Publicado : 12 de mayo de 2011
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Lycoming Flyer

GENERAL

Lycoming Flyer 

If you are not sure of the meaning of such terms as normally aspirated, turbocharged, supercharged or direct-drive engines, then perhaps you’ll want to read our simplified definition of them. The Normally Aspirated Engine is one that is not turbocharged  or supercharged. If the airplane has a manifold pressure gauge, at full takeoff power at sea level on a standard day, it would indicate an MP reading of approximately 29" of Hg. Takeoff power  at 5,000 ft. density altitude airport would read about 24" MP.  The normally aspirated engine uses atmospheric pressure and is  thereby altitude limited. Direct-Drive Engines are those piston-powered engines where  the propeller is bolted on the end of the crankshaft, and the prop turns at the same speed as the crankshaft. Geared Engines are usually the higher powered, more complex engines using a reduction gear on the nose of the aircraft,  and with the prop attached to it. As a result, the prop will turn  somewhat slower than the crankshaft, resulting in a lower prop  noise level. When the engine is geared, we precede the engine designation with a “G.” Thus a geared, opposed (O) normally  aspirated Lycoming engine with a 480-cubic inch displacement  of the cylinders would be designated a GO-480 model. Turbocharged Engines as manufactured by Lycoming simply  consist of a turbocharger unit with a small turbine wheel attached  by a common shaft to a compressor wheel, and utilizes the engine  exhaust gas by directing it over the turbine wheel to drive the compressor. The horsepower loss in operating the turbocharger is  negligible. Turbocharging can provide greater utility to the piston  engine by providing sea-level horsepower, in some models, as high  as 20,000 feet; or it can be used to add horsepower to the engine  particularly for takeoffs. The faster the engine runs, the more air  the turbocharger can pack into the cylinder to compensate for the thin air of altitude, or to increase the horsepower. Although this  definition is somewhat oversimplified, it is a basic definition of  turbocharging of General Aviation power plants. Where  turbocharging  is  used  with  a  fuel-injected,  opposed    Lycoming  engine  with  a  540  cubic  inch  displacement,  we  designate  it  as  a  TIO-540  model.  “T”  represents  the    turbocharging. Supercharged Enginesas manufactured by Lycoming uses a  compressor wheel to pack air into the cylinders; but the compressor is driven by the crankshaft through an intricate gearing  system, which takes considerable horsepower from the engine to  operate. In comparison with a turbocharged engine, it is a medium  altitude power plant. Although supercharged engines could be built by Lycoming, new aircraft designs during the past 20 or more years have used  turbocharging instead of supercharging because of the advantages  that turbocharging offers. A supercharged, geared, opposed, fuel-injected Lycoming  engine with cylinders of 540-cubic inch displacement is designated an IGSO-540 model. “S” represents supercharging.
8 Lycoming Flyer

  All publications may be ordered through authorized Lycoming distributors, or direct from Lycoming. If ordered by mail direct  from Lycoming, payment in the form of check or money order  must be submitted with the request as outlined in the latest revision of Lycoming Service Letter No. 114. Fax or telephone orders  will be accepted if payment is made with a credit card: American  Express, Visa and MasterCard are accepted. The available maintenance publications for Lycoming engines  and accessories consist of the following:OPERATOR’S MANUAL The Operator’s Manual contains information of use to pilots and  maintenance personnel. It contains engine specifications, inspection procedures, operational information, and is used in conjunction with the Pilots Operating Handbook for the aircraft. OVERHAUL MANUALS...
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