General Aircraft Technical Knowledge Practice Test

Ram air in the engine intake is:

Filtered Unfiltered Partially filtered Not applicable

Correct Answer:

Unfiltered

Explanation:

Ram air is the air that flows into the engine simply because the airplane is moving forward. It is unfiltered to avoid added resistance that would reduce the mass of air the engine can ingest, which directly affects engine performance and thrust. Filtration would create a pressure drop, especially at high speeds, so the intake is designed to minimize restriction. In practice, large debris may be kept out by inlet screens or debris diverters, but fine filtration of ram air is not used in the engine intake path.

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