AD 2011-25-51
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | Motors | Airworthiness Directives; Continental Motors, Inc. (CMI) Reciprocating Engines |
Unsafe Condition
Fractures in starter adapter shaft gears in certain part number (P/N) CMI starter adapters, leading to failure of the starter adapter gear shaft, an inoperable oil scavenge pump, and engine in-flight shutdown.
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Required Actions
Replace affected CMI starter adapters with starter adapters eligible for installation. Eligible adapters are those with a vibro-peened manufacturer code below the ink stamped P/N or have more than 100 hours total time-in-service (TIS).
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Compliance Time
Before further flight for adapters with less than 75 hours TIS; within the next 10 hours of engine operation or before exceeding 100 hours TIS for adapters with 75-100 hours TIS; no further action required for adapters with more than 100 hours TIS.
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Affected Aircraft
Continental Motors, Inc. (CMI) TSIO-520-B, BB, D, DB, E, EB, J, JB, K, KB, N, NB, UB, VB; TSIO-550-K; TSIOF-550-K; IO-550-N (Turbo-normalized only; STC SE10589SC) engines with starter adapter part numbers 642085A17, 642085A19, 642085A20, 642085-1A1, and R-642085A17, manufactured or replaced between January 1, 2011 and November 20, 2011.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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