AD 51-13-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 202 | Martin Models 202 and 202A Series Aircraft |
| aircraft | Martin-Marietta Corporation | 202A | Martin Models 202 and 202A Series Aircraft |
Unsafe Condition
Cracks in wing top cover splice angles and wedge assemblies could lead to wing structural failure.
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Required Actions
Inspect wing top cover splice angles using 2- to 6-power glass. Replace cracked top cover wedge assemblies with specified new parts. Reinstall outer wings with engines removed and shim gaps as specified. Perform torque check on attach angle bolts post-first flight. Replace attach angle bolts and spar web splice bolt every 12,000 flight hours.
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Compliance Time
Every other No. 3 inspection period, approximately 620 hours flight time, or 6 months, whichever occurs first (for most aircraft except serials 9125-9127, 9129-9131 which require every 170 hours flight time). Replacement actions must be completed by January 1, 1953 (most aircraft) or May 15, 1952 (serials 9125-9127, 9129-9131). Bolt replacements every 12,000 flight hours.
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Affected Aircraft
Martin-Marietta Corporation Models 202 and 202A Series Aircraft, excluding serial numbers 9125 through 9127 and 9129 through 9131 (except for section 2 which applies to those serials).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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