AD 48-49-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 Airplanes |
Unsafe Condition
Some essential electrical circuits were inadvertently connected to the distribution bus instead of the master bus, increasing the risk of loss of power for circuits critical in flight.
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Required Actions
Inspect all DC-6 aircraft to ensure specified circuit protectors (Radio Master, Fuel Booster Pumps, Inverter Power, Propeller Booster, Propeller Control, Propeller Synchronizer, Governor Control, Generator Control Panel) are connected to the master bus. Rewire as necessary per Douglas Service Bulletin DC-6 No. 329.
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Compliance Time
not later than March 1, 1949
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Affected Aircraft
The Boeing Company DC-6, DC-6A, DC-6B airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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