Airworthiness Directives; Pratt & Whitney Canada PT6A-15AG, -27, -28, -34, -34AG, -34B, and -36 Series Turboprop Engines
airworthiness · Rule · Final rule; request for comments. · Published 2011-10-17 · Effective 2011-11-01 · 76 FR 64001
Document
Document number
2011-26840
Federal Register citation
76 FR 64001
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Publication date
2011-10-17
Effective date
2011-11-01
FAA docket
Docket No. FAA-2011-1038
Abstract
We are adopting a new airworthiness directive (AD) for Pratt & Whitney Canada PT6A-15AG, -27, -28, -34, -34AG, -34B, and -36 series turboprop engines. This emergency AD was sent previously to all known U.S. owners and operators of these engines. This AD requires the removal of affected part manufacturer approval (PMA) replacement Timken Alcor Aerospace Technologies, Inc. (TAATI) first stage reduction sun gears and the interacting planet gears, from the propeller reduction gearbox assembly. This AD was prompted by failures of certain PMA replacement first stage reduction sun gears, manufactured by TAATI. We are issuing this AD to correct the unsafe condition on these products.