What stops the engine/propeller from being cranked by the starter before the pylon is fully raised?

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What stops the engine/propeller from being cranked by the starter before the pylon is fully raised?

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A limit switch detects when the pylon is in the fully raised position and only when this happens will the starter work. This eliminates the possibility of accidentally cranking the engine and having the propeller impact the engine bay doors or fuselage. The ignition/fuel-injection system can be turned on prior to raising the pylon (i.e. fuel can circulate before pylon is fully raised).

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