AD 97-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | E165-2 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E165-3 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E165-4 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-1 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-10 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-11 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-2 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-3 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-5 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
| engine | Continental Motors | E185-8 | Airworthiness Directives; Teledyne Continental Motors E-165, E-185, E-225, O-470 and IO-470 Series Reciprocating Engines |
Unsafe Condition
The cylinder bore surface finish on some cylinders is rougher than specified due to extended exposure to the manganese phosphate treatment, causing increased piston pin plug wear, which wears a groove in the cylinder wall leading to massive oil consumption and potential piston pin plug disconnection, resulting in extreme side loading of the piston and consequent engine failure.
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Required Actions
Remove affected cylinders from service, reassemble with serviceable parts following the latest revision of TCM Critical Service Bulletin CSB97-10A, including procedures for removal, shipment to the factory, and reassembly.
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Compliance Time
Before further flight
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Affected Aircraft
Teledyne Continental Motors E-165, E-185, E-225, O-470, and IO-470 series engines with serial numbers listed in Table 1 of CSB97-10A or cylinders with part numbers and purchase dates in Table 2 of CSB97-10A, installed on various aircraft models including Bellanca, Cessna, Frontier-Aerospace, Luscombe, and Navion.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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