The National Transportation Safety Board (NTSB) is providing the following information to urge the Federal Aviation Administration (FAA) to take action on the safety recommendation in this report. This recommendation is intended to prevent failures of spool bearings installed in the power turbine governors (PTG) of certain Rolls-Royce (formerly Allison) 250-series engines. It is derived from the NTSB’s investigation of a fatal accident in which an MD Helicopters 369E helicopter, N629JK, impacted trees and terrain near Reedsville, Wisconsin. As a result of findings in this investigation, the NTSB is issuing one safety recommendation to the FAA.
This report contains safety recommendations issued to the FAA, and does not include any determination of probable cause.