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From the FAA library

  • Glossary

    strip made of two different types of metal fastened together side by side. When heated, the two metals expand different amounts and the strip warps or bends. BITE. Built-in test equipment. A troubleshooting system installed in many modern electronic ... blade of a propeller corresponds to the wing of an airplane. Blending. A method of repairing damaged compressor and turbine blades. The damage is removed and the area is cleaned out with a fine file to form a shallow depression…

  • Chapter 1: Aircraft Engines › Combustion Section › Turbine Section

    Turbine Section The turbine transforms a portion of the kinetic (velocity) energy of the exhaust gases into mechanical energy to drive the gas generator compressor and accessories. The sole purpose of the gas generator turbine is to absorb approximately ... percent of the total pressure energy from the exhaust gases. The exact amount of energy absorption at the turbine is determined by the load the turbine is driving (i.e., compressor size and type, number of accessories, and the load applied…

  • Chapter 15: Transition to Turbopropeller-Powered Airplanes › Turboprop Engine Types › Split-Shaft/Free Turbine Engine

    Split-Shaft/Free Turbine Engine In a free power-turbine engine, such as the Pratt & Whitney PT-6 engine, the propeller is driven by a separate turbine through reduction gearing. The propeller is not on the same shaft ... basic engine turbine and compressor. [Figure 15-5] Unlike the fixed-shaft engine, in the split-shaft engine the propeller can be feathered in flight or on the ground with the basic engine still running. The free power-turbine design…