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 Air Worthiness Directive, which called for a strengthened containment ring. The failed containment ring was in compliance with the Air Worthiness Directive.

the pilot-in-command's (non-flying pilot) improper flare. Related factors were inadequate crew/coordination, haze and sunglare.