AD 51-19-04
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
Failure of the windshield anti-icing, deicing, and defogging systems due to reliance on wing heat, potential leaks in heater fuel control box, lag in emergency high seat switches, stepping relays in fire-detection circuit, unsafe landing gear indication, rudder servo motor stall torque, and insufficient nacelle structure reinforcement.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a system independent of wing heat for windshield anti-icing/deicing/defogging; redesign heater fuel control box for leak tightness and draining; relocate emergency high seat switches; redesign fire-detection circuit to eliminate stepping relays; improve landing gear position indicating system; reduce gear ratio and install field rheostat in rudder servo motor circuit; reinforce nacelle structure. Equivalent safety modifications are acceptable.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required by October 15, 1952; January 1, 1952; April 1, 1952; prior to reactivation of autopilot; before accumulation of 8,000 hours total operating time.
AI-generated summary from the source AD text. Verify against the official source before acting.
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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