AD 47-40-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | Teledyne Continental Motors | C-125-1 | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C-125-2 | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12F | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12FH | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C75-12FJ | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-12F | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
| engine | Continental Motors | Teledyne Continental Motors | C85-12FJ | CONTINENTAL Models C75-12, -12F, C85-12, -12F or -12FHJ, C125-1 or -2 Engines |
Unsafe Condition
Piston pins installed in engines of the specified serial numbers and distributed as replacement parts are subject to failure without warning. The weakness cannot be detected by normal inspection methods, leading to piston pin breakage and potential complete engine failure.
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Required Actions
Replace piston pin assembly No. 22248-A1 (0.6875-inch inside diameter) with thick wall piston pin assembly No. 25121-A1 or 25262-A1 (0.5945-inch inside diameter).
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Compliance Time
Compliance required immediately if engine has attained or passed 600-hour major overhaul period, but in any event not later than December 31, 1947, or 600 hours of operation, whichever occurs first.
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Affected Aircraft
Continental Motors/Teledyne Continental Motors models C75-12, -12F, C85-12, -12F, -12FHJ, C125-1, or -2 engines with specific serial numbers below the listed exceptions.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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