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27 Cards in this Set
- Front
- Back
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Where does the fuel metering system of a turbine engine discharge its fuel? |
through spray nozzles into the combustion chambers. |
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What is adjusted when the fuel control unit of a turbine engine is trimmed?
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idle speed and maximum–thrust |
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What are two locations water may be injected into a turbine engine?
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At the compressor inlet and at the inlet to the diffuser |
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What is meant by a duplex nozzle in a turbine engine fuel metering system?
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A duplex fuel nozzle is one that has two fuel discharge passages. |
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Does the fuel–air mixture provided by a float carburetor become richer or leaner as the aircraft goes up in altitude?
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If the mixture is not adjusted, it will become richer as the aircraft gains in altitude. |
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Does the fuel–air mixture provided by a float carburetor become richer or leaner when carburetor heat is applied?
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The mixture becomes richer when carburetor heat is applied.
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What would happen to the fuel–air mixture ratio in a float carburetor if the main air bleed were to become plugged?
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The mixture would become excessively rich.
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How does the automatic mixture control in a pressure carburetor keep the fuel–air mixture constant as the aircraft changes altitude?
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It automatically increases or decreases the air metering force. |
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Why must the diaphragms of a pressure carburetor be soaked before the carburetor is ready for flight? |
restores them to the condition of flexibility that they had when the carburetor was calibrated. |
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How does the exhaust gas temperature of a reciprocating engine tell anything about the fuel–air mixture being burned by the engine?
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a mixture in which all of the the fuel–air mixture are burned produces the highest exhaust gas temperature. |
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What two things are adjusted when adjusting the idling of a reciprocating engine?
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The throttle stop and the idle mixture control |
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What is the significance of the letters that are stamped on the flats of a fuel injection nozzle?
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The letters designate the size of the orifice in the injector nozzle. |
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What is the function of the economizer system in an aircraft engine carburetor? |
allows the engine to operate with an economically lean mixture for all conditions other than full power. |
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In what position is the mixture control placed for starting an engine that is equipped with a pressure carburetor?
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In the Idle Cutoff position. |
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In what position is the carburetor heat control placed when starting an aircraft engine?
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In the Cold position.
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Where is the fuel from a continuous–flow fuel injection system discharged?
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It is discharged through injector nozzles screwed into the cylinder heads |
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In which direction relative to the wind should a turbine–powered aircraft be positioned when the fuel control is being trimmed?
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If the wind velocity is less than 10 miles per hour, it can be faced in any direction. If the wind velocity is between 10 and 25 MPH, it should be trimmed facing into the wind. do not trim if more that 25mph |
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What engine parameters are sensed by the fuel control unit of a turbine engine?
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Engine RPM, inlet air pressure, compressor discharge pressure, burner can pressure, and inlet air temperature. |
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When does the acceleration system operate on an aircraft carburetor?
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When the throttle is suddenly opened. |
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What is meant by trimming a turbine engine?
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Adjusting the fuel control for the proper specific gravity of the fuel and for the proper idle and full throttle RPM |
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What are two types of electronic fuel controls for turbine engines?
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Supervisory Electronic Engine Control and Full–Authority Digital Electronic Control
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What is a FADEC?
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Full–Authority Digital Electronic Control |
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Does a turbine engine controlled by a FADEC require manual trimming?
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No, this is done by the FADEC |
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When should a turbine engine be retrimmed?
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Any time there is a decrease in engine thrust, and after any maintenance that the manufacture specifies as requiring retrimming |
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Are the instruments installed in a aircraft suitable for use when trimming a turbine engine?
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No, a special analyzer/trimmer such as a JetCal should be used |
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What specifications are used to trim a turbine engine?
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the data on the engines trim plug |
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Where should ambient temp be measured when trimming?
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In a shaded area near the engine inlet |
