AD 61-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All DC-6 and DC-7 Series Airplanes |
Unsafe Condition
Fuel transfer in flight can occur due to lack of antifuel transfer check valves in the fuel system, which may lead to improper fuel distribution and potential loss of engine power.
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Required Actions
Install a placard in the flight compartment stating 'Fuel Transfer in Flight Prohibited' and revise the FAA-approved airplane flight manual to incorporate fuel system operation procedures prohibiting fuel transfer in flight and deleting references to installed check valves.
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Compliance Time
within the next 330 hours' time in service
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Affected Aircraft
The Boeing Company DC-6, DC-6A, DC-6B, DC-7, DC-7B, DC-7C series airplanes which do not have antifuel transfer check valves installed in the fuel system.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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