starting and ignition system Flashcards

1
Q

what are the 3 things required to start a GTE?

A

fuel, air and an ignition

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2
Q

what are 4 methods to turn a GTE?

A

electric, gas, fluid, forward motion

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3
Q

on engine start up what component turns first and why?

A

high pressure compressor, because the compressor drives the turbine and HP is a smaller mass than LP

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4
Q

what does the HP cock do?

A

used to shut down the engine. stops fuel flow to the engine and is an engine component

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5
Q

What does the LP cock do?

A

Stops fuel from leaving the tank and is an airframe component

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6
Q

What are four possible starting faults

A

Ignition failure, fuel delivery failure, over fuelling and failure to reach correct RMP

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7
Q

Why aren’t electrical starters used on large turbofan engines

A

They don’t provide enough torque

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8
Q

When are turbine temperatures at their highest?

A

During the engine start due to thermal shock

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