AD 48-10-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS DC-6 Aircraft |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS DC-6 Aircraft |
Unsafe Condition
Failure of the cabin heater fuel system components, such as the fuel pressure regulator diaphragms, fuel pump check valve, or fire extinguishing systems, could lead to fuel leakage or fire hazards during Class A operations with cabin supercharging and thermal deicing active.
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Required Actions
Inspect and rework cabin heater fuel system components per specified Douglas Service Bulletins, disconnect and block fuel lines to the cabin heater, revise the Airplane Flight Manual with FAA-approved procedures, and ensure compliance with fire protection modifications.
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Compliance Time
prior to return to service in class A operation-with cabin supercharging and thermal deicing operative (with the exception of heat windshield deicing) and with cabin heaters inoperative.
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Affected Aircraft
The Boeing Company DC-6, DC-6A, DC-6B aircraft as specified in the referenced Service Bulletins, with serial numbers listed on the pertinent Service Bulletins.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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