Definition

An in-flight shutdown (IFSD) is the stoppage of an aircraft engine while airborne.

Description

An IFSD occurs any time an aircraft engine ceases to function while in flight. This can include a contained or uncontained engine failure, or an emergency or precautionary shutdown carried out by the flight crew. IFSDs are often discussed in terms of extended range operations. During extended range operations, aircraft must be able to safely reach an alternate airport with the remaining engine(s) in the event of an IFSD.

Emergency engine shutdowns may occur due to fire or severe mechanical failure. Precautionary shutdowns may occur due to high oil temperature, low oil pressure, low oil quantity, low hydraulic pressure or quantity, or propeller overspeed in turboprop aircraft.