AD 51-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 202 | Martin Models 202 and 202A Airplanes |
| aircraft | Martin-Marietta Corporation | 202A | Martin Models 202 and 202A Airplanes |
Unsafe Condition
Modification Board Items
Required Actions
Decrease breaker rating for propeller anti-icing circuit to 5 amperes to accommodate No. 20 wire (Model 202 only). Install negative pressure scoop on battery vent line. Add manually operated charging valve in the emergency brake hydraulic system per Service Bulletin No. 185. Provide circuit protection for voltmeter, generator tip light circuit at main bus, and ammeter wires. Install circuit breaker in circuit breaker panel with wire routed back to auxiliary bus control relay.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required by August 16, 1951; November 16, 1951; December 1, 1951; and February 1, 1952 respectively.
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Affected Aircraft
Martin-Marietta Corporation Models 202 and 202A airplanes except as noted.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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