Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for Pratt & Whitney JT8D-200 series turbofan engines. That AD currently requires installation of high pressure turbine (HPT) containment hardware on JT8D-217C and -219 engines. That AD also currently requires replacing LPT-to-exhaust case bolts and nuts with improved containment hardware on JT8D-209, -217, -217A, -217C, and -219 engines. This proposed AD would require installation of improved HPT containment hardware on JT8D-209, -217, -217A, -217C, and -219 engines. This proposed AD results from four reports of uncontained HPT failures of JT8D-200 series engines, since AD 99-22-14 was issued. We are proposing this AD to prevent uncontained HPT events resulting from HPT shaft fractures.