AD 2009-19-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental | Motors O-470 | Airworthiness Directives; Teledyne Continental Motors O-470, IO-470, TSIO-470, IO-520, TSIO-520, IO-550, and IOF-550 Series Reciprocating Engines |
Unsafe Condition
Cracks in the cylinder head between the upper spark plug bore and the fuel injector/primer nozzle bore due to reduced wall thickness in TCM EQ3 cylinder head casting.
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Required Actions
Initial and repetitive visual inspections of TCM EQ3 cylinders for cracks must be conducted. All EQ3 cylinders must be replaced within 1,300 hours total time of operation after the effective date of this AD.
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Compliance Time
Within 20 flight hours after the effective date of this AD for initial inspections; within 1,300 hours total time of operation after the effective date for cylinder replacement.
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Affected Aircraft
Teledyne Continental Motors O-470, IO-470, TSIO-470, IO-520, TSIO-520, IO-550, and IOF-550 series reciprocating engines with TCM EQ3 cylinders installed, as identified in Table 1 of this AD and cross-referenced with engine serial numbers in TCM Mandatory Service Bulletin MSB09-1B.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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