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Splitter plate on the fuselage side of an F-4 Phantom II

Splitter plate forming a lip on the underside of a Eurofighter Typhoon

A splitter plate is a component in some jet aircraft, used to control the airflow into the engine. Where the engine air intake is mounted partway back along the fuselage or under the wing, the splitter plate diverts the boundary layer away from the engine intake. It is a form of boundary layer control.