FLAPPER VALVE FOR AIRCRAFT ENGINE

A valve assembly (20) for an aircraft engine (10) includes a base (21) defining an air opening (19) configured to receive airflow therethrough in a flow direction from an upstream side (15) to a downstream side (17), a stopper (24) extending from the downstream side (17) of the base (21) adjacent the air opening (19), and a flapper plate (22) pivotably mounted to the base (21) about a pivot axis (25). The flapper plate (22) is pivotable relative to the base (21) and the stopper (24) between a closed position (22B) and a fully open position (22A). In the fully open position (22A), a downstream surface (28) of the flapper plate (22) abuts the stopper (24). In the closed position (22B), the flapper plate (22) obstructs the air opening (19). A deflector (41) extends from an upstream surface (26) of the flapper plate (22) and projects into the airflow when the flapper plate (22) is located in the fully open position.