AD 46-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Gladden Products Corp. | Kinner R-5 Series 2 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
| engine | Gladden Products Corp. | Kinner R-55 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
| engine | Gladden Products Corp. | Kinner R-56 | KINNER Model R-5 Series 2, R-55, and R-56 Engines |
Unsafe Condition
Master rod knuckle pinholes may not fit properly with the knuckle pins, leading to potential failure of the connecting rod assembly.
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Required Actions
Grind the master rod knuckle pinholes to a fit of 0.0003 to 0.0008-inch (tight) with the knuckle pins. Rebore the connecting rod bushings, replace the knuckle pins and wrist pin bushings. Mark engine serial numbers with an 'O' to indicate rework completion.
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Compliance Time
Rework required immediately if total engine time has already exceeded 500 hours, or if not, rework must be accomplished before exceeding 500 hours.
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Affected Aircraft
Gladden Products Corp. Kinner R-5 Series 2, R-55, and R-56 engines installed on Fairchild 24J, 24JS, 24W Series, Jobmaster DGA-18K, Meyers OTW-160, and Ryan ST-3KR airplanes with engine serial numbers: 12005 to 12319 inclusive; 12805 to 12846 inclusive; 12938 to 12948 inclusive; 12950 to 12952 inclusive; 12954 to 12973 inclusive; 12975 to 12976 inclusive; 13034 to 13037 inclusive; and 13040 to 13056 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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