AD 50-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | C145-2 | CONTINENTAL Model C145 Engines |
| engine | Continental Motors | C145-2H | CONTINENTAL Model C145 Engines |
Unsafe Condition
Crankcase and/or cylinder barrel failures due to cracks around cylinder base areas and improper torque on cylinder base nuts, contributing to engine operation difficulties.
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Required Actions
Visually inspect crankcase for cracks around each cylinder base, except for new type crankcases (P/N 530836 and 530837) on engines serial No. 4383 and above or overhauled after September 1, 1949. Visually inspect cylinder barrels for cracks at the base flange fillet. Install new flanged-type cylinder base nuts (P/N 531001 and 531003) and ensure proper torque (500±10 in-lbs for 7/16 fasteners, 420±10 in-lbs for 3/8 studs). Discontinue inspections after one 25-hour inspection post-installation of new nuts.
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Compliance Time
Compliance required by June 1, 1950, and each 25-hour period of operation thereafter.
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Affected Aircraft
Continental Motors Model C145-2 and C145-2H engines, serial numbers 3000 to 5031 inclusive, except serials 3612, 4650, 4652, 4654, 4671, 4676, 4679, 4683, 4690, 4710, 4855, 4889, 4904, 4996, 4997, 5002 through 5021, and 5023 through 5029.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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