AD 50-32-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | E165-2 | CONTINENTAL Model E185-3, E185-1, E165-2 Engines |
| engine | Continental Motors | E165-3 | CONTINENTAL Model E185-3, E185-1, E165-2 Engines |
| engine | Continental Motors | E185-1 | CONTINENTAL Model E185-3, E185-1, E165-2 Engines |
Unsafe Condition
Sudden oil pump failure (and almost immediate complete engine failure resulting therefrom) due to shearing of the square corners of the oil pump drive gear shaft.
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Required Actions
Inspect oil pump drive gear shaft backlash using Continental Drive Fit Indicator (P/N 530757). If backlash exceeds 15 degrees, replace worn parts including oil pump drive gear, oil pump housing, accessory case, and cam gear (if cam gear concentricity exceeds 0.004 inch runout). Repeat inspections at 10-hour intervals until overhaul if initial reading is ≤15 degrees, and replace parts if additional 5 degrees wear occurs within 20 hours.
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Compliance Time
Compliance required each 10 hours of operation as indicated.
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Affected Aircraft
Continental Motors E185-3 engines serially numbered 4514-D and below, E185-1 engines serially numbered 4566-D and below, and E165-2 engines serially numbered 10025 and below, installed on Navion, Beech Model 35, and Temco (Luscombe) Model 11A airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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