How many bearings does the engine have?

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Prepare with flashcards and multiple choice questions for the ATR General Familiarization Test. Gain insights into various aircraft systems, hints, and explanations for a successful exam experience. Get ready to excel!

Multiple Choice

How many bearings does the engine have?

Explanation:
Bearings support and align rotating parts inside the engine, reducing friction and carrying loads. To know how many bearings an engine has, you count all the bearing surfaces that support moving components: main crankshaft bearings, connecting-rod bearings, camshaft bearings, and any bearings in the gear train or accessory drive. In this typical engine configuration, those add up to seven bearings. The other options don’t address a count of bearings—one is a percentage, another is the reduction gear box, and the last is an emergency exit door—so they aren’t relevant to the question.

Bearings support and align rotating parts inside the engine, reducing friction and carrying loads. To know how many bearings an engine has, you count all the bearing surfaces that support moving components: main crankshaft bearings, connecting-rod bearings, camshaft bearings, and any bearings in the gear train or accessory drive. In this typical engine configuration, those add up to seven bearings. The other options don’t address a count of bearings—one is a percentage, another is the reduction gear box, and the last is an emergency exit door—so they aren’t relevant to the question.

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