AD 52-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS Models DC-6, DC-6A, DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS Models DC-6, DC-6A, DC-6B Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS Models DC-6, DC-6A, DC-6B Aircraft |
Unsafe Condition
Overvoltage in the Eclipse Generator System and General Electrical Generator System could lead to electrical fire and loss of essential electrical and electronic equipment necessary for continued flight.
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Required Actions
Replace B-14 generator contactors with 120-volt rated high-voltage contactors in the Eclipse system. Install overvoltage relays and either replace G.E. P/N 3GTR-77A102 relays with 120-volt rated relays or rework G.E. P/N XRP-12 circuit breakers to trip with the generator control relay in the General Electric system.
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Compliance Time
as soon as practicable, but not later than February 1, 1954
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Affected Aircraft
Douglas Models DC-6, DC-6A, DC-6B aircraft below serial number 43274
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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