AD 52-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 404 | MARTIN Model 404 Airplanes |
Unsafe Condition
Inadvertent actuation of the propeller reversing solenoid valves due to lack of protection of the reversing solenoid circuits from other energized circuits.
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Required Actions
Protect the reversing solenoid circuits from other circuits per Attachment A and specific instructions, modify terminal strips and control boxes, inspect and check circuits at 350-hour intervals, and initiate maintenance practices for electrical fault inspections. Compliance with item 5 of Attachment A for operating instructions is required.
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Compliance Time
Item I must be accomplished by a progressive modification program beginning no later than August 10, 1952, and completed no later than December 15, 1952. Maintenance practices (Item II) must be initiated not later than August 10, 1952.
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Affected Aircraft
Martin-Marietta Corporation Model 404 airplanes, 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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