EASA AD US-2018-22-01
Engine - Second Stage Turbine Rotors - Removal
The Federal Aviation Administration's Airworthiness Directive 2018-22-01 addresses Honeywell International Inc. TPE331 turboprop engines, specifically models TPE331-8, -10, -10N, -10R, -10U, -10UA, -10UF, -10UG, -10UGR, -10UR, and -11U equipped with certain second stage turbine rotor assemblies. This directive mandates the removal of specific second stage turbine rotors at reduced life limits to prevent unsafe conditions. It was issued following reports of uncontained rotor separation and discovery of cracks in the turbine rotors.