AD 48-11-01
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
The unsafe condition involves the potential failure of cabin heating and thermal deicing systems when operating in class B with cabin supercharging inoperative, which could lead to loss of heating and anti-icing functionality, increasing the risk of operational hazards.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Accomplish rework per specified Douglas Service Bulletins, including disconnecting superchargers and draining/flushing the supercharger oil system. Exclude certain service bulletins (258, 225, 230) and partially accomplish others as noted.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to return to service in class B operation
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Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft with cabin supercharging inoperative, as specified in the referenced Service Bulletins and Douglas Co. data.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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