AD 52-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6, DC-6A and DC-6B Airplanes |
Unsafe Condition
Inadvertent actuation of the propeller reversing solenoid valves due to lack of electrical circuit isolation from other circuits, which could lead to unintended propeller reversal and loss of aircraft control.
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Required Actions
Modify reversing solenoid circuits by isolating them from other circuits and each other through specific wiring changes, terminal modifications, and protective shielding as per Douglas Service Bulletin DC-6 NO. 356 and Hamilton Standard Service Bulletin No. 221. Implement maintenance inspections every 350 flight hours and operational checks per specified procedures.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Progressive modification program to begin no later than August 1, 1952, and be completed no later than August 1, 1953.
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Affected Aircraft
Douglas DC-6, DC-6A, and DC-6B airplanes with Hamilton Standard propellers.
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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