Emergency AD Issued for PT6A-67AG and -67F Engines

On February 16, the FAA issued an Emergency Airworthiness Directive (AD 2024-04-51) for Pratt & Whitney Canada (P&WC) Model PT6A-67AG and PT6A-67F engines (among other dashes not in ag use). This AD was prompted by reports of contained failures of second-stage power turbine (PT2) blades. The root cause has not been determined, however, all affected power turbine modules contained PT2 blades with part number 3056693-01 and with 25 hours or less of accumulated flight time since new.

This AD directs immediate compliance with Transport Canada Emergency AD CF-2024-05, which mandates removal of affected blades prior to next flight. Critically, affected PT2 blades are defined as those identified in the P&WC Alert Service Bulletin (ASB) PT6A-72-A14574, and have accumulated less than 50 hours flight time since new, or since shop visit or since second-stage power turbine repair. Thus, if your PT2 blades have accumulated more than 50 hours flight time, they are not considered affected blades.

This Emergency AD is intended to prevent the failure of PT2 blades. This condition, if not addressed, could result in engine power loss or engine in-flight shut down, resulting in consequent emergency landing or reduced control of the airplane.