airworthiness · Rule · Final rule. · Published 2002-05-23 · Effective 2002-06-27 · 67 FR 36092
Document
Document number
02-12630
Federal Register citation
67 FR 36092
Type
Rule
Action
Final rule.
Category
airworthiness
Publication date
2002-05-23
Effective date
2002-06-27
FAA docket
Docket No. 2001-NE-27-AD
Abstract
This amendment adopts a new airworthiness directive (AD), that is applicable to Pratt & Whitney (PW) JT9D-59A, -70A, -7Q, and -7Q3 turbofan engines. This amendment requires fluorescent penetrant inspection of the high pressure turbine (HPT) second stage airseal knife edges for cracks, each time the airseal is accessible. This amendment is prompted by reports of cracks found in the knife edges of HPT second stage airseals during HPT disassembly. The actions specified by this AD are intended to prevent failure of HPT second stage airseals due to cracks in the knife edges, which if not detected could result in uncontained engine failure and damage to the airplane.