AD 56-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | E165-2 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E165-3 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E165-4 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-1 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-10 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-11 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-2 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-3 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-5 | CONTINENTAL Models O-470 Series and E Series Engines |
| engine | Continental Motors | E185-8 | CONTINENTAL Models O-470 Series and E Series Engines |
Unsafe Condition
Failure of the piston pin assembly, oil pump gear assembly, or exhaust valve could cause serious engine damage in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace piston pin assembly with P/N 539467 in specified engines. Replace oil pump gear assembly with P/N 539525 in specified engines. Replace exhaust valve with P/N 539449 in specified engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as soon as possible but not later than July 1, 1956.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Continental Motors O-470 Series and E Series engines with serial numbers listed in the AD, excluding remanufactured engines shipped after May 1, 1955, and those designated as exceptions.
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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