Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for Pratt & Whitney (PW) JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines. That AD currently requires fluorescent penetrant inspection (FPI) of high pressure turbine (HPT) second stage airseals, part numbers (P/Ns) 5002537-01, 788945, 753187, and 807410, knife-edges for cracks, each time the engine's HPT second stage airseal is accessible. This proposed AD would require replacing each existing HPT second stage airseal with an improved design HPT second stage airseal and modifying the 2nd stage HPT vane cluster assembly and 1st stage retaining blade HPT plate assembly at next piece-part exposure, but no later than five years after the effective date of the proposed AD. These actions would be considered terminating action to the repetitive inspections required by AD 2002-10-07. This proposed AD results from the manufacturer introducing an improved design HPT second stage airseal and modifications to increase cooling. We are proposing this AD to prevent failure of the HPT second stage airseal due to cracks in the knife- edges, which if not detected could result in uncontained engine failure and damage to the airplane.