AD 55-20-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 202 | MARTIN Models 202, 202A, and 404 Aircraft |
| aircraft | Martin-Marietta Corporation | 202A | MARTIN Models 202, 202A, and 404 Aircraft |
| aircraft | Martin-Marietta Corporation | 404 | MARTIN Models 202, 202A, and 404 Aircraft |
Unsafe Condition
Nose gear steering shaft failures at the machined splines due to torsional fatigue.
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Required Actions
Inspect for cracks using dye penetrant, magnetic particle, or vapor blast inspections. Install new type shafts (Menasco P/N 526681) on all 202 and 202A aircraft and 404 aircraft with shimmy dampeners. Inspect original type shafts (Menasco P/N 511681) with added relief cut every 2,500 hours (or 1,000 hours for 404 without dampeners). Reinspect cracked original shafts at 325-hour intervals after grinding to remove cracks.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Martin-Marietta Corporation Models 202, 202A, and 404 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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