AD 47-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Univair Aircraft Corporation | 415-C | Airworthiness Directives; ERCO Model 415C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-CD | Airworthiness Directives; ERCO Model 415C, -CD and -D Aircraft |
| aircraft | Univair Aircraft Corporation | 415-D | Airworthiness Directives; ERCO Model 415C, -CD and -D Aircraft |
Unsafe Condition
Cracks have occurred in the belly skin at the rearmost rivet attaching the center section belly skin outer stiffeners (Erco P/N 415-13056 L/R) to the belly skin.
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Required Actions
Install 0.064-inch 24ST alclad angles 1/2-inch wide with legs of 1 3/32 inches and 1/2 inch (Erco P/N 415-13068). If cracks are found, drill relief holes at the ends of the cracks and install triangular shaped patch plates of 0.032-inch 24ST alclad material with specified rivets.
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Compliance Time
prior to October 1, 1947
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Affected Aircraft
Univair Aircraft Corporation Model 415-C, 415-CD, and 415-D Aircraft, serial numbers 800 through 2037.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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