AD 97-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-540-M1B5D | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | LTIO-540-F2BD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | LTIO-540-J2B | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | LTIO-540-J2BD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | LTIO-540-N2BD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | LTIO-540-R2AD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | TIO-540-A2C | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | TIO-540-F2BD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | TIO-540-J2B | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming Engines | TIO-540-J2BD | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
Unsafe Condition
Cylinder head separation due to insufficient wall thickness in Superior Air Parts, Inc. PMA part numbers SL54000 series replacement cylinder assemblies, leading to inflight loss of power, possible engine failure, and fire.
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Required Actions
Remove cylinders with 300 or more hours Time in Service (TIS) since installation within 5 hours TIS after the effective date and replace with serviceable parts. For cylinders with 245-299 hours TIS, perform initial dye penetrant inspection within 5 hours TIS after the effective date, followed by repetitive inspections at intervals not exceeding 25 hours TIS until reaching 300 hours TIS, then remove and replace. Cylinders with less than 245 hours TIS must begin inspections at 250 hours TIS. Operators may choose to replace affected cylinders instead of inspections.
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Compliance Time
Within 5 hours Time in Service (TIS) after the effective date of this AD for certain actions, and subsequent intervals as specified.
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Affected Aircraft
Textron Lycoming Models TIO-540-A2C, -F2BD, -J2B, -J2BD, -N2BD, -R2AD, -S1AD, LTIO-540-J2B, -F2BD, -J2BD, N2BD, -R2AD, and IO-540-M1B5D engines with Superior Air Parts, Inc. PMA part numbers SL54000-A1, -A2, -A2P, -A20P, and A21P cylinder assemblies, serial numbers 001 through 650.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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