airworthiness · Rule · Final rule; request for comments. · Published 2012-05-08 · Effective 2012-05-23 · 77 FR 26943
Document
Document number
2012-11057
Federal Register citation
77 FR 26943
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Pratt & Whitney Canada Turboprop
Publication date
2012-05-08
Effective date
2012-05-23
FAA docket
Docket No. FAA-2012-0417
Abstract
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Canada PT6A-38, -41, -42, -42A, -61, -64, -66, -66B, - 110, -112, -114, -114A, -121, -135, and -135A series turboprop engines. This AD requires removal from service of certain part manufacturer approval (PMA) replacement Timken Alcor Aerospace Technologies, Inc. (TAATI) first stage sun gears and planet gears installed in the reduction gearbox. This AD was prompted by failures of certain first stage sun gears manufactured by TAATI. We are issuing this AD to prevent failure of the sun gear and planet gears which will result in an engine in-flight shut down, possible uncontained engine failure, aircraft damage, and serious injuries.