Sun, Aug 01, 2021
AD 2021-14-13 Prompted By A Report Of An Uncontained Engine Failure Resulting From Cracks In The Knife Edge Of The HPT
The FAA is adopting a new airworthiness directive (AD) for all Pratt & Whitney (PW) PW2037, PW2037M, PW2040, and F117-PW-100 model turbofan engines.
This AD was prompted by a report of an uncontained engine failure resulting from cracks in the knife edge of the highpressure turbine (HPT) 2nd-stage air seal assembly. This AD requires fluorescent penetrant inspections (FPIs) and visual inspections of the HPT 2nd-stage air seal assembly and, depending on the results of the inspections, replacement of the HPT 2nd-stage air seal assembly with a part eligible for installation. This AD also requires replacement of the affected HPT 2nd-stage air seal assembly, depending on the engine model, at either the next engine shop visit or the next piece-part opportunity. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective September 1, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to all PW PW2037, PW2037M, PW2040, and F117-PW-100 model turbofan engines. The NPRM published in the Federal Register on June 1, 2020 (85 FR 33043). The NPRM was prompted by a report of an uncontained engine failure resulting from cracks in the knife edge of the HPT 2nd-stage air seal assembly. After further analysis, it was determined that the knife-edge crack was due to seal rubbing that elevated the HPT 2nd-stage air seal assembly temperature and induced fatigue. In the NPRM, the FAA proposed to require initial and repetitive borescope inspections (BSIs), FPIs, and visual inspections of the HPT 2nd-stage air seal assembly and, depending on the results of the inspections, replacement of the HPT 2nd-stage air seal assembly with a part eligible for installation. The NPRM also proposed to require replacement of the affected HPT 2nd-stage air seal assembly, depending
on the engine model, at either the next engine shop visit or the next piece-part opportunity. The FAA is issuing this AD to address the unsafe condition on these products.
More News
Airbus Racer Demonstrator Makes Inaugural Flight Airbus Helicopters' ambitious Racer demonstrator has achieved its inaugural flight as part of the Clean Sky 2 initiative, a corners>[...]
A little Bit Quieter, Said Testers, But in the End it's Still a DA40 Diamond Aircraft recently completed a little pilot project with Lufthansa Aviation Training, putting a pair of >[...]
Line Up And Wait (LUAW) Used by ATC to inform a pilot to taxi onto the departure runway to line up and wait. It is not authorization for takeoff. It is used when takeoff clearance >[...]
Contributing To The Accident Was The Pilot’s Use Of Methamphetamine... Analysis: The pilot departed on a local flight to perform low-altitude maneuvers in a nearby desert val>[...]
From 2015 (YouTube Version): Overcoming Obstacles To Achieve Their Dreams… At EAA AirVenture 2015, FedEx arrived with one of their Airbus freight-hauling aircraft and placed>[...]
Airbus Racer Helicopter Demonstrator First Flight Part of Clean Sky 2 Initiative
See All