Incident Overview
Description
A Boeing 747-269B airplane, N707CK, had an uncontained engine failure during climb-out from the Anchorage International Airport, Alaska. There were no injuries to the five crewmembers aboard. During climbout, the Boeing 747 crew noted a loud ‘thump,’ followed by a change in the number three engine instrument indications. One crewmember noted there was a fist-sized hole in the side of the engine cowling. The captain shut down the number three engine, returned to the departure airport, and landed without further incident. A post landing inspection revealed that the inboard aileron sustained substantial damage. PROBABLE CAUSE: “The failure of a turbine blade, and subsequent penetration of the shroud (containment ring). A factor associated with the accident was the FAA’s insufficient design standards/requirements addressed in an FAA Airworthiness Directive, which called for a strengthened containment ring. The failed containment ring was in compliance with the Air Worthiness Directive.”
Primary Cause
Turbine blade failure resulting in penetration of the shroud containment ring.Turbine blade failure resulting in penetration of the shroud containment ring.Share on:
