AD Amdt-39-10260
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | Motors IO-360 | Airworthiness Directives; Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, IO-520, LIO-520, TSIO-520, LTSIO-520 Series, and Rolls-Royce plc IO-360 and TSIO-360 Series Reciprocating Engines |
| engine | Rolls-Royce | plc IO-360 and TSIO-360 Series Reciprocating | Airworthiness Directives; Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, IO-520, LIO-520, TSIO-520, LTSIO-520 Series, and Rolls-Royce plc IO-360 and TSIO-360 Series Reciprocating Engines |
Unsafe Condition
Crankshaft failures due to subsurface fatigue cracking on engines inspected in accordance with AD 87-23-08.
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Required Actions
Remove crankshafts manufactured using the airmelt process and replace them with vacuum arc remelt (VAR) process crankshafts. Perform ultrasonic inspection using new criteria and replace crankshafts if cracks are found.
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Compliance Time
Before further flight
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Affected Aircraft
Teledyne Continental Motors and Rolls-Royce plc engines: IO-360, TSIO-360, LTSIO-360, IO-520, LIO-520, TSIO-520, LTSIO-520 series reciprocating engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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