AD 80-17-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | TIO-540-S1AD | AVCO LYCOMING Model TIO-540-S1AD Engine |
Unsafe Condition
Seized throttle movement due to transition wastegate assembly issues could lead to loss of engine power control.
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Required Actions
Prior to each flight, check throttle movement for stiffness or binding by releasing the throttle friction lock, moving the throttle from idle to full open and back. If stiffness or binding occurs, replace wastegate valve or cable assembly with new assembly per Lycoming SB 448. Alternate compliance methods may be approved by FAA.
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Compliance Time
prior to each flight after receipt of this directive until a new transition wastegate assembly P/N LW16858 is installed
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Affected Aircraft
Lycoming Model TIO-540-S1AD engines with serial numbers from L-5253-61A to L-6991-61A excluding specified ranges, installed in Piper PA-32RT-300T and PA-32R-301T aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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