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.
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Federal Register Abstract
Openings Around the Control Cables and Flap Buss System
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-12-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-12-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes Subject: Openings Around the Control Cables and Flap Buss System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-12-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-12-01 SUBJECT HEADING: DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-12-01 DOUGLAS: (Was Mandatory Note 14 of AD-762-7.) Applies to All C-54 and R5D Series Airplanes, and the Following DC-4 Airplanes: 42904 to 42943, Inclusive; 42948 to 42952, Inclusive; 42982 to 42996, Inclusive; 43065 to 43069, Inclusive; 43071; 43072; and 43102. DC-4 Production Airplanes Nos. 43070, 43090, and Subsequent Except 43102, as Noted Above, Will be Modified Prior to Delivery. To be accomplished not later than January 1, 1948. If the clear-view panel in the windshield is opened in flight when the landing gear and flaps are extended, exhaust fumes enter the cabin. This causes considerable discomfort to passengers and may create a hazard which would affect the safe operation of the airplane. In order to prevent the exhaust fumes from entering the cabin under these conditions, all openings around the control cables and flap buss system at the side of the fuselage must be sealed and additional means for exhausting main cabin and cockpit ventilating air provided, unless tests made by the operator of the individual airplane show no unsatisfactory condition of carbon monoxide entering cabin with open windows when landing gear down and flaps extended. (Douglas Service Bulletin No. DC-4, No. 32, covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_47-12-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-12-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes Subject: Openings Around the Control Cables and Flap Buss System Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: C54-DC | C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-12-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-12-01 SUBJECT HEADING: DOUGLAS Model C-54 and R5D Series Airplanes and DC-4 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-12-01 DOUGLAS: (Was Mandatory Note 14 of AD-762-7.) Applies to All C-54 and R5D Series Airplanes, and the Following DC-4 Airplanes: 42904 to 42943, Inclusive; 42948 to 42952, Inclusive; 42982 to 42996, Inclusive; 43065 to 43069, Inclusive; 43071; 43072; and 43102. DC-4 Production Airplanes Nos. 43070, 43090, and Subsequent Except 43102, as Noted Above, Will be Modified Prior to Delivery. To be accomplished not later than January 1, 1948. If the clear-view panel in the windshield is opened in flight when the landing gear and flaps are extended, exhaust fumes enter the cabin. This causes considerable discomfort to passengers and may create a hazard which would affect the safe operation of the airplane. In order to prevent the exhaust fumes from entering the cabin under these conditions, all openings around the control cables and flap buss system at the side of the fuselage must be sealed and additional means for exhausting main cabin and cockpit ventilating air provided, unless tests made by the operator of the individual airplane show no unsatisfactory condition of carbon monoxide entering cabin with open windows when landing gear down and flaps extended. (Douglas Service Bulletin No. DC-4, No. 32, covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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