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Fri, May 11, 2012

AD: Pratt & Whitney Canada Turboprop Engines

AD NUMBER: 2012-09-10

PRODUCT: Certain Pratt & Whitney Canada PT6A-38, -41, -42, -42A, -61, -64, -66, -66B, -110, -112, -114, -114A, -121, -135, and -135A series turboprop engines.
SUBJECT: Airworthiness Directive 2012-09-10
ACTION: Final rule; request for comments.

SUMMARY: 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. The FAA Is 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.

DATES: This AD becomes effective May 23, 2012. Comments are due by June 22, 2012.



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