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Turbine Engines
O&P(P)
| Question | Answer |
|---|---|
| How are the four strokes of a recip engine similar to the sections of a turbine engine | Intake= air inlet section Compression= compressor section Ignition and power= combustion and turbine sections exhaust= exhaust section |
| What type of turbojet engine is commonly used in commercial aviation due to lower noise and better fuel consumption | High bypass turbofan engines |
| What four types of gas turbine engines are used in aircraft | Turbojet, Turboprop, Turboshaft, Turbofan |
| What are the two types of turbine compressors? | Centrifugal and axial flow |
| What is meant by trimming an engine | Adjusting the fuel control so the engine develops the correct idle and trim speed RPM |
| What type of equipment should be used to determine that a turbine engine is performing up to the standards specified by the engine manufacturer | A JetCal analyzer/trimmer has all of the instrumentation and cables to determine the EGT, EPR, and other parameters specified by the engine manufacturer |
| What is meant by the hot section inspection? | An inspection of the hot section of a turbine engine. The hot section includes the combustors, the turbine, and the exhaust system |
| What is meant by on-condition maintenance of a turbine engine? | The monitoring of the engine performance at regular intervals and determining when maintenance is required based on certain operating parameters specified by engine manufacturer |
| What checks of a turbine engine are necessary to verify preflight conditions? | Inspect the cowling and air inlet areas and attachment of the engine to the airframe Inspect the inlet guide vanes and 1st stage compressor or fan blades Check for unusual noise when compressor is rotated Inspect the rear turbine and exhaust system Ch |
| What engine instruments are monitored during the start of a turbine engine | Tach, oil pressure, internal gas temp |
| What checks are performed after the installation of a turbine engine | After starting and idle speed is obtained, and engine instrument values are monitored. Takeoff thrust is checked by adjusting the throttle to obtain a single, predicted reading on the EPR indicator. The manufacturer's procedures and limitations must be fo |
| What engine fault could cause a turbine engine to have high exhaust gas temp, low RPM, and high fuel flow at all engine speeds | Possible turbine damage and/or loss of turbine efficiency due to excessive wear |
| What would be the indications of an engine bleed air valve malfunctioning | Engine has higher than normal exhaust gas temp during takeoff, climb, and cruise. RPM and fuel flow are higher than normal |
| What is the primary purpose of bleeding air off the compressor section | To unload the compressor at low speeds and to control the flow of air to the combustion burners |
| What is the secondary Purpose or use of bleed air | Cabin pressurization, heating and cooling, deicing and anti-icing systems, pneumatic starting of engines and auxiliary drive units, vortex dissipators |
| Where are most APUs located in modern jet transport aircraft | In the tail cone of the fuselage |
| What is the function of the APU | An APU provides electric power and compressed air when main engines are not operating |
| What are two sources of compressed air from an APU | From bleed air from the APU turbine compressor, or from a load compressor driven by a free turbine in the engine |
| Where in maintenance info based on the ATA-100 system would you fine instructions for inspecting and servicing the engine of an airborne APU | In section 49-20 |
| How is most of the troubleshooting done for modern APU | By the fault codes generated by the FADEC |
| What ensures that an APU will not be shut down while it is too hot | The APU fuel control incorporates an automatic time-delay feature that closes the bleed air valve to remove most of the load reduce the APU temp before it is shut down |
| WHat prevents the APU exceeding its safe operating limits when the bleed air valve is wide pen | The FADEC monitors the load and regulates the fuel going to the APU to prevent it from exceeding its safe limits |
| What document would you use to find the safety procedures to follow when replacing an igniter plug in an APU engine | The maintenance manual for the APU |
| What adjustments and rigging are accomplished on a turbine engine? | The primary rigging on a turbine engine involves the adjustment of power control levers and cables, followed by careful adjustment of the fuel control unit to trim the engine for the correct idle speed and obtain maximum thrust |
| How is a turbine engine preserved for long periods of inactivity | Common practices include draining the lubrication system and flsuhing with preservative oil. The engine fuel system may also be drained and filled with preservative oil, including the fuel control. Before the engine can be returned to service, the preserv |
Created by:
tbarth
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