The FAA issued an Emergency airworthiness directive (AD), detailing inspections of specific Honeywell TFE731 turbofan engines following reports of 2nd stage low-pressure turbine (LPT2) blade separations.
On June 10, 2014 the U.S. Federal Aviation Administration issued an Emergency airworthiness directive (AD), prompted by reports of 2nd stage low-pressure turbine (LPT2) blade separations on TFE731 engines. Analysis indicates the presence of casting anomalies at or near the root of the LPT2 blade. This condition, if not corrected, could result in LPT2 blade failure, multiple engine in-flight shutdowns, and damage to the airplane.
The AD requires before further flight a review of the engine log book maintenance records to determine if any affected engines are installed. Operation is prohibited of an airplane with two or more affected engines that have LPT2 blades with less than 250 operating hours since new after receipt of the emergency AD.
Affected engine series are: Honeywell International Inc. (Type Certificate previously held by AlliedSignal Inc., Garrett Turbine Engine Company) TFE731-4, -4R, -5AR, -5BR, -5R, -20R, -20AR, -20BR, -40, -40AR, -40R, -40BR, -50R, and -60 turbofan engines. These engines are fitted to various corporate jet models and some military jet trainers.
- EAD-2014-12-52 (PDF)