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Electric Starter Motor and Sprag Clutch in Gas Turbine Engines

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Electric Starter Motor and Sprag Clutch in Gas Turbine Engines

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Questions and Answers

During a normal engine start cycle, at what approximate rotational speed does the engine reach self-sustaining operation?

30% of maximum RPM (correct)

10% of maximum RPM

20% of maximum RPM

40% of maximum RPM

What is the purpose of the blowout cycle during an unsuccessful start attempt?

To prevent potential damage by allowing unburnt fuel to drain or evaporate (correct)

To purge the engine of any residual air

To rapidly cool down the engine components

To test the starter motor's functionality

What is the typical duty cycle (maximum operating time) of an air turbine starter motor in modern turbofan engines?

6-8 minutes

3-5 minutes (correct)

9-11 minutes

1-2 minutes

If the engine fails to start within the starter motor's duty cycle, what action is typically taken?

The fuel and ignition are switched off, but the starter motor continues to run Signup and view all the answers

During engine start, which two key instruments should be closely monitored?

Exhaust Gas Temperature (EGT) gauge and High-Pressure (HP) compressor rotational speed gauge Signup and view all the answers

What is the initial event that occurs during a normal engine start cycle?

The ignition system is activated, and the igniters begin to glow Signup and view all the answers

What event causes the second rise in Exhaust Gas Temperature (EGT) during a normal start cycle?

The Fuel Control Unit progressively increasing fuel flow Signup and view all the answers

What is the purpose of the automatic cancellation of the starter motor and igniters during a normal start cycle?

To allow for a smooth transition to idle RPM Signup and view all the answers

Which component is responsible for regulating fuel flow during the engine start cycle?

The Fuel Control Unit Signup and view all the answers

What is the purpose of the starter motor during the engine start cycle?

To rotate the compressor until the engine reaches self-sustaining speed Signup and view all the answers