National Transportation Safety Board 2

摘要

In this letter,the National Transportation Safety Board recommends that the Federal Aviation Administration (FAA) take action to address a safety issue concerning uncontained engine failures as a result of cracking in the 2nd stage turbine hub blade retaining lugs on Pratt & Whitney (P&W) PW2037 engines.The Safety Board identified this safety issue during its investigation of an uncontained engine failure that occurred on August 6,2008.Although the investigation is continuing,information gathered to date has raised serious concerns that warrant immediate action by the FAA.