AD 46-36-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | A-65-1 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-12J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14F | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14FJ | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-14J | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
| engine | Continental Motors | A-65-3 | CONTINENTAL Models A-65, A-75, A-80 Series Engines |
Unsafe Condition
Piston pins installed in engines with serial numbers from 3456658 to 4109568, or those with A-21422 piston pins or new 3-Ring pistons installed since September 25, 1945, are subject to failure without warning. The weakness cannot be detected by normal inspection methods, and breakage can cause complete engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace piston pin P/N A-21422 with thick wall piston pin No. A-25127. Examine pistons for skirt cracks and rework the bottom rib by reducing its height and rounding sharp corners. Alternatively, install cam ground pistons P/N 40731 with larger diameter piston pins.
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Compliance Time
50 hours of engine operation after August 27, 1946
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Affected Aircraft
Continental Models A-65, A-75, A-80 Series Engines with serial numbers from 3456658 to 4109568 inclusive, or those with A-21422 piston pins or new 3-Ring pistons installed since September 25, 1945.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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