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37 Cards in this Set
- Front
- Back
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What is meant by a hot-section inspection?
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An inspection of the hot section of a turbine engine. The hot section include the combustors, the turbine, and the exhaust system.
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What is meant by on-condition maintenance of a turbine engine?
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The monitoring of the engine performance at regular intervals and determining when maintenance is required based on certain operating parameters specified by the engine manufacturer.
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What checks of a turbine engine are necessary to verify preflight condition?
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-Inspection of the cowling and all air inlet areas and attachment of the engine to the airframe.
-Inspection of the inlet quide vanes and the first stage of the compressor or fan blades. -Check for unusual noise when the compressor is rotated. -Inspection of the rear turbine, and exhaust system. -Check the quantity of the lubricating oil for the engine and the constant-speed drive unit. -Check the ignition system for operation by listening for the sparks. |
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What is meant by trimming a turbine engine?
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Adjusting the fuel control so the engine develops the correct idle and trim speed RPM.
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What type of equipment should be used to determine that a turbine engine is performing up to the standards specified by the engine manufacturer?
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A JedCal Analyzer/Trimmer has all of the instrumentation and cables to determine the EGT, EPR, and the other parameters specified by the engine manufacturer.
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Where can the find the model of magneto that is approved for an engine specified by the examiner?
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In the Type Certificate Data Sheet for the engine.
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What is a Supplemental Type Certificate?
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An approval issued by the FAA for a modification to a type-certificated airframe, engine or component
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What paperwork is necessary for the installation of a magneto that was not approved for an engine when it was certificated, but is approved for the engine when installed according to an STC.?
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A form FAA 337 must be completed stating that the installation was done in accordance with the specific STC.
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What are 3 types of flow-indicating systems used for turbine engines?
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Vane-type flow meters, synchronous mass-type flow meters, and electronic motorless mass flow meters.
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What do mass flow systems measure?
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The mass of the flow. This is affected by the density of the fuel which is in turn affected by the fuel temp.
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In what units is an electronic motorless mass flow meter system calibrated?
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pounds per hour of fuel flow.
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What is indicted in a turbine engine if the fuel flow for all conditions is high?
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If there are other instrument abnormalities, there are possible damaged turbine components.
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Who is authorized to repair a fuel flow indicating system?
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The components can be repaired only by an FAA approved repair station certifcated for the particular instruments.
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Where can you find the electrical power requirements for a fuel flow indicating system?
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in the aircraft maintenance manual.
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Where in the fuel system is the fuel flow transmitter located?
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between the fuel control and fuel nozzles.
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What kind of indicating system is used to measure oil temperature in a small single -engine, general aviation airplane?
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A sealed system in which a bulb, partially filled with a highly volatile liquid, is installed inside the oil strainer. The bulb is connected to a pressure gage by a copper tube. The pressure of the gas above the liquid is proportional to the temperature of the oil that surrounds the bulb, and the pressure gage is calibrated in terms of temperature
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What tupe of instrument system is used for measuring cylinder-head temperature and exhaust gas temperature?
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a thermocouple system.
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What kind of electrical instrument system is used for measuring oil temperature?
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a ratiometer-type system.
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What should a thermocouple cylinder-head temperature indicator read when the engine is cold?
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the same as the outside air temp. gage.
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What is the critical in the installation of the thermocouple leads for a cylinder-head temperature indicator, the length of the leads or the resistance?
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The resistance is critical, it must have the resistance specified on the indicator. This is usually 2 or 8 ohms.
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What should a ratiometer temperature indicator read when the electrical power is off?
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the pointer should be off scale on the low side.
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What kind of tachometer is used on most small single-engine airplanes?
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A magnetic drag tachometer that is similar to an automobile speedometer.
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What would likely cause the pointer of a magnetic drag tachometer to oscillate?
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either a dry cable connecting the indicator to the engine, or a kink in the cable housing.
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Is it permissible for a mechanic with an airframe and powerplant rating to replace the tachometer cable for a magnetic drag tachometer?
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yes, this does not constitute a repair to an instrument.
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What kind of tachometer is used on most large multi-engine airplanes?
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A three-phase AC electric tachometer.
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What kind of indicator mechanism is used to measure oil pressure?
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a Bourdon tube (sounds French to moi)
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What kind of indicator mechanism is used to measure manifold pressure?
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a differential bellows.
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What should a manifold pressure gage read when the engine is not operating?
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the existing barometric pressure as
indicated on the altimeter barometric scale when the altimeter pointers are set to the surveyed field elevation. |
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What type of fitting is used to connect an oil pressure gage to the engine?
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a fitting with a restrictor that smoothes out the pulsations and prevents a break in the indicator line, causing a serious loss of engine oil.
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What is used to fill the line between a fuel pressure gage and the fuel metering system?
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a light oil such as kerosine.
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What could cause a fuel pressure gage to fluctuate?
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The loss of the light oil in the line between the gage and the engine.
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How does a ratiometer-type oil temperature gage measure the temperature of the oil?
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a ratiometer measures the resistance of the temperature bulb. The indicator is calibrated in degrees Farenheit or Celsius rather than in ohms.
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What is the range of pressure needed for a fuel pressure gage used with a float carburetor?
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normally from 1 to 25 psi.
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What are 4 types of engine fire detection systems?
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thermoswitch system, thermocouple system, thermistor-type continous-loop system, pneumatic-type continous-loop system.
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Which type of fire detection system operates on the principle of the rate of temperature rise?
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The thermocouple system.
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Why must the reference junction in a thermocouple fire detection system be thermally insulated?
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this is a rate-of-temperature-rise system. The reference junction must be insulted so its temp will not rise as quickly as that of the measuring junctions if a fire should occur.
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How do you check a thermocouple fire detection system for operation?
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press the test switch. This heats the test thermocouple enought for it to close the sensitive rely, which in turn closes the slave relay and activates the fire warning light and bell.
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