airworthiness · Rule · Final rule; request for comments. · Published 2005-12-27 · Effective 2006-01-11 · 70 FR 76381
Document
Document number
05-24448
Federal Register citation
70 FR 76381
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Pratt & Whitney JT9D-7R4 Turbofan
Publication date
2005-12-27
Effective date
2006-01-11
FAA docket
Docket No. FAA-2005-23072
Abstract
The FAA is adopting a new airworthiness directive (AD) for Pratt & Whitney (PW) JT9D-7R4 turbofan engines. This AD requires inspection of the blade root thickness of 1st stage fan blades identified by part number (P/N) and serial number (SN) in this AD, by a repair station approved by PW to perform the inspection. This AD results from a report that a repair station created their own repair and performed it on 520 1st stage fan blades, without approval from PW. We are issuing this AD to prevent 1st stage fan blade fracture and uncontained engine failure, resulting in possible damage to the airplane.