AD 2011-20-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada PT6A-15AG | Airworthiness Directives; Pratt & Whitney Canada PT6A-15AG, -27, -28, -34, -34AG, -34B, and -36 Series Turboprop Engines |
Unsafe Condition
Failures of certain first stage reduction sun gears, manufactured by TAATI, could result in failure of the shaft portion of the sun gear, leading to engine in-flight shutdown, 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 PMA replacement TAATI first stage reduction sun gear and the interacting planet gears from the propeller reduction gearbox assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 15 operating hours or 15 days after the effective date of this AD, whichever occurs first.
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 with TAATI PMA replacement first stage reduction sun gear, part number E3024765, serial numbers PC5-091 through PC5-176, 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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