AD 57-03-04
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
Zone III fires and combustion heater system malfunctions could lead to uncontrolled fires and reduced safety margins in the nacelle area and heater control systems.
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Required Actions
Replace or lag fireproof materials on nacelle ducting and fuel lines, install fire detectors in specified nacelle areas, modify fuel supply and control systems with steel tubing, solenoid valves, overheat circuits, and revised flight manuals. Item 7 for 404 aircraft requires additional solenoid valves and steel clips by July 1, 1958.
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Compliance Time
Not later than April 1, 1958, except item 7 required not later than July 1, 1958.
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Affected Aircraft
Martin-Marietta Corporation Models 202, 202A, and 404 aircraft, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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