AD 2000-23-21
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | Motors IO-360 | Airworthiness Directives; Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, O-470, IO-470, TSIO-470, IO-520, TSIO-520, LTSIO-520, IO-550, TSIO-550, and TSIOL-550 Series Reciprocating Engines |
Unsafe Condition
Subsurface defects in the number one crankshaft connecting rod journal, resulting from unique material composition characteristics and process control variations during steel production or forming operations, which could lead to crankshaft connecting rod journal fracture.
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Required Actions
Remove a core sample of material from the propeller mounting flange of the crankshaft and send it to Teledyne Continental Motors (TCM) for evaluation. Clean, chamfer, dye check, and paint the core sample holes. Replace any crankshafts found to be unserviceable with a serviceable crankshaft prior to further flight.
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Compliance Time
Before further flight
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Affected Aircraft
Teledyne Continental Motors IO-360, TSIO-360, LTSIO-360, O-470, IO-470, TSIO-470, IO-520, TSIO-520, LTSIO-520, IO-550, TSIO-550, and TSIOL-550 series reciprocating engines assembled, rebuilt, or overhauled using a crankshaft manufactured between April 1, 1998, and March 31, 2000, as listed by engine and crankshaft serial number in TCM Mandatory Service Bulletin (MSB) 00-5C, dated October 10, 2000.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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