AD 86-20-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Cessna Aircraft Company | 404 | Airworthiness Directives; Cessna Model 404 Airplanes |
Unsafe Condition
Cracks in the engine mount beams could lead to structural failure.
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Required Actions
Inspect engine beams for cracks via fluorescent penetrant inspection per Cessna Service Bulletin MEB 86-7. Inspections must be done within next 100 flight hours for airplanes with 1600+ hours TIS, or between 1600-1700 hours TIS for those with less. If cracks <2.00 inches, stop drill and install SK 404-40. For cracks >2.00 inches, contact Cessna for repair. Compliance required as indicated unless already done.
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Compliance Time
Required as indicated, unless already accomplished.
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Affected Aircraft
Cessna Model 404 airplanes with serial numbers 404-0001 through 404-0136, 404-0201 through 404-0246, 404-0401 through 404-0460, 404-0601 through 404-0695, and 404-0801 through 404-0859.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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