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Airworthiness Directive

AD 2011-20-51 76 FR 64001 Active

Federal Aviation Administration · 14 CFR part 39

Requires the removal of affected part manufacturer approval (PMA) replacement Timken Alcor Aerospace Technologies, Inc.

Federal Register (opens in a new tab)FAA DRS (opens in a new tab)

FR document
2011-26840
Amendment
39-16843
Published
2011-10-17
Effective
2011-11-01
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/2011-20-51 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

2011-20-51

FR doc 2011-26840 · 76 FR 64001

AD 2011-20-51Published 2011-10-17Effective 2011-11-01

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires the removal of affected part manufacturer approval (PMA) replacement Timken Alcor Aerospace Technologies, Inc.

Full official 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.

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All Pratt & Whitney Canada PT6A directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index