AD 74-22-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | 6-285-B | TELEDYNE CONTINENTAL MOTORS Model 6-285-B Engines |
Unsafe Condition
Omission of crankcase main bearing oil supply passages could result in insufficient lubrication, leading to bearing failure and engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect crankcase main bearing oil supply passages per Teledyne Continental Service Bulletin M74-21. If an omitted oil passage is found, remove the engine from service.
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Compliance Time
within the next 25 hours time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Teledyne Continental Motors Model 6-285-B engines with serial numbers 700000 through 700095
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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