Summary
The FAA proposes to adopt a new airworthiness directive (AD) for Honeywell International Inc. (formerly AlliedSignal Inc. and Garrett Turbine Engine Co.) TFE731-2 and -3 series turbofan engines with certain part numbers (P/Ns) and serial numbers (SNs) of low pressure (LP) 1st and 2nd stage turbine rotor discs initially installed as new parts before April 1, 1991. This proposed AD would require replacement of those LP 1st and 2nd stage turbine rotor discs. This proposed AD results from a report of an uncontained failure of an LP 2nd stage turbine rotor disc that caused an in-flight engine shutdown. We are proposing this AD to prevent LP turbine rotor disk separation, which could result in an uncontained engine failure and damage to the airplane.