AD 2012-09-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney | Canada | Airworthiness Directives; Pratt & Whitney Canada Turboprop Engines |
Unsafe Condition
Failures of certain first stage sun gears, manufactured by TAATI, leading to potential failure of the sun gear and planet gears in the propeller reduction gearbox assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service the specified PMA replacement TAATI first stage sun gears and planet gears within 40 operating hours after the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 40 operating hours after the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Canada PT6A-38, -41, -42, -42A, -61, -64, -66, -66B, -110, -112, -114, -114A, -121, -135, and -135A series turboprop engines with TAATI PMA replacement first stage sun gears or planet gear sets installed, specifically P/N E3028456, E3037304, E3101455-02, and E3101525-02, all serial numbers.
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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