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Turbine Engines O&P

QuestionAnswer
What are the two basic sections of a turbine engine? The hot section and the cold section.
What are the two basic types of compressors that are used in aircraft turbine engines? Axial-flow and centrifugal.
What is the purpose of the stators in an axial-flow compressor? change the direction of the air for the next stage of rotors
What are three types of combustors used on aircraft turbine engines? Can-type, annular-type, can-annular-type.
How many igniters are there normally in an aircraft turbine engine? Two.
What is the main purpose of the turbine nozzle in an aircraft turbine engine? directs the hot gases as they leave the combustors
What is meant by a free-turbine turboshaft engine? a turbine wheel, or stage of turbine wheels, that is not used to drive the compressor of the gas generator section of the engine.
Why do some axial-flow turbine engines have more than one set of turbines and compressors? so they can operate at the speed at which they are most efficient
What kind of bearings are used to support the rotor shaft of an aircraft turbine engine? ball bearings, roller bearings.
What is meant by a turbofan engine? An axial-flow turbine engine in which the first stage of compressor blades are lengthened, so they can force air around the outside of the gas generator portion of the engine.
Where can you find the limits of repair allowed for the compressor blades of an aircraft turbine engine? In the FAA-approved service manual issued by the manufacturer of the engine.
Why is it important that a turbojet engine be allowed to cool before it is shut down after it has been operated at a high power setting? If the engine is shut down while it is hot, there is a possibility that the shroud will contract around the turbine wheel and seize the rotor.
What is meant by a hung start in a turbine engine? A start in which ignition occurs, but the engine does not accelerate to a self-sustaining speed.
What is meant by a hot start in a turbine engine? A start in which ignition occurs, but the internal temperatures go high enough that they can damage the engine.
What is meant by creep of the turbine blades? A condition of permanent elongation of the turbine blades.
How is the compressor of a turbine engine cleaned? An emulsion-type cleaner is sprayed through the engine while it is being motored by the starter or operated at a low speed. The wash is followed by a clean water rinse.
What is a more vigorous cleaning of a turbine engine done with? by injecting a mild abrasive, such as ground-up apricot pits or walnut shells, into the engine while it is operating at low speed.
Where is water injected into a turbine engine for cooling purposes? Into the compressor inlet and into the engine diffuser case.
At what point in a turbine engine is the temperature the highest? At the inlet to the high-pressure turbine.
What is the function of the interconnect tubes between the cans of a turbine engine that uses can-type combustors? allows the flame to travel from the cans that contain the igniters to all of the other cans when the engine is being started.
What are two types of thrust reversers that are used on turbojet engines? mechanical blockage- clamshell aerodynamic blockage- cascade
What is meant by trimming a turbojet engine? Adjusting the fuel control to get the correct idling and maximum-thrust RPM.
Where are most APUs located in modern jet transport aircraft? In the tail cone of the fuselage.
What is the function of an APU? provides electric power and compressed air when the main engines are not operating.
What are two sources of compressed air from an APU? bleed air from the APU load compressor driven by a free turbine in the engine.
Where in maintenance information based on the ATA-100 system would you find instructions for inspecting and servicing the engine of an airborne APU? 49 20.
How is most of the troubleshooting done for a modern APU? By the fault codes generated by the FADEC.
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