AD 47-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes |
Unsafe Condition
Exhaust fumes enter the cabin when the clear-view panel in the windshield is opened in flight with the landing gear and flaps extended, causing passenger discomfort and potential hazard affecting safe operation.
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Required Actions
Seal all openings around the control cables and flap buss system at the side of the fuselage and provide additional means for exhausting main cabin and cockpit ventilating air, unless tests show no unsatisfactory carbon monoxide entry with open windows, landing gear down, and flaps extended.
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Compliance Time
not later than January 1, 1948
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Affected Aircraft
Douglas Model C-54 and R5D Series Airplanes and DC-4 Airplanes with serial numbers 42904 to 42943, inclusive; 42948 to 42952, inclusive; 42982 to 42996, inclusive; 43065 to 43069, inclusive; 43071; 43072; and 43102.
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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