Summary
This document proposes the adoption of a new airworthiness directive (AD) that is applicable to Pratt & Whitney PW2000 series turbofan engines. This proposal would require a reduction in the cyclic service life limit for hubs, disks, airseals, blade retaining plates, and airsealing ring supports on certain high pressure turbines (HPT) and low pressure turbines (LPT), and provide for optional inspections for cracks or rework of certain HPT and LPT hardware in order to retain the original, higher cyclic service life limit for these components. This proposal is prompted in part by new temperature data from engine testing, which were used in recalculating stress levels, and resulted in a change to the calculated cyclic service life limit. The actions specified by the proposed AD are intended to prevent HPT or LPT failure, which may result in an uncontained engine failure and possible damage to the aircraft.