AD 46-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Ryan Aeronautical Company | ST-3KR | Airworthiness Directives; Ryan Model ST-3KR Aircraft |
Unsafe Condition
Cracks in the front fin spar at its attachment to the fuselage could lead to structural failure.
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Required Actions
At each periodic inspection, examine the front fin spar at its attachment to the fuselage for cracks. If cracks are found, repair by cutting the spar approximately 3 1/4 inches above the lower bend and splicing on a 1 1/8 by 0.058 inch X-4130 spar replacement section using 3/16-inch bolts.
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Compliance Time
at each periodic inspection
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Affected Aircraft
Ryan Model ST-3KR Aircraft, serial numbers 1001 to 2249, inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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