AD 2011-25-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada | Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines |
Unsafe Condition
Failure of the Timken Alcor Aerospace Technologies, Inc. (TAATI) part manufacturer approval (PMA) replacement first stage reduction sun gear, part number (P/N) E3024765, or the associated planetary gear sets, which could result in an engine in-flight shut down, possible uncontained engine failure, aircraft damage, and serious injuries.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove the affected TAATI PMA replacement first stage reduction sun gears, P/N E3024765, with serial numbers (S/Ns) PC5-051 through PC5-089, or S/Ns SG36-051 through SG36-120, and/or the associated planetary gear sets, P/N E3101455-02, with S/Ns EE-051 through EE-197, S/Ns EE-4051 through EE-4094, or S/N EE-4113, from the propeller reduction gearbox assembly. Inspect the chip detector on the propeller reduction gearbox assembly for metal debris within 10 operating hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 operating hours after the effective date of this AD for chip detector inspections. Removal of affected parts is required within the compliance times specified in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Canada PT6A-15AG, -27, -28, -34, -34AG, -34B, and -36 series turboprop engines that have had maintenance involving the first stage reduction sun gear or planetary gear set replacement since December 22, 2008, and having the specified TAATI PMA replacement parts installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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