AD 47-42-16
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
Combustion chamber failure in surface combustion Model 63A66 thermal anti-icing heaters and Model A63A68 cabin and thermal anti-icing heaters could lead to heater malfunction or failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove combustion chambers for inspection and pressure test at each 500-hour interval of heater operation. Carefully inspect the downstream end of the combustion chambers at each periodic inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at each 500-hour interval of heater operation
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC-6, DC-6A, DC-6B aircraft with surface combustion Model 63A66 and Model A63A68 heaters
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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