AD 46-39-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54B and C-54 Series Airplanes |
Unsafe Condition
The main fuel line supporting brackets at wing Stations 357, 378, and 399 are subject to vibration failure.
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Required Actions
Replace the main fuel line supporting brackets at wing Stations 357, 378, and 399 with redesigned brackets. Replace United Carr clips at wing Station 378 with Adel clips.
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Compliance Time
not later than December 1, 1946
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Affected Aircraft
The Boeing Company Model C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC airplanes having the C-54B fuel system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Fuel Line Supporting Brackets
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_46-39-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-39-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54B and C-54 Series Airplanes Subject: Main Fuel Line Supporting Brackets 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| C54A-DC | C54B-DC | C54D-DC | C54E-DC | C54G-DC Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 46-39-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-39-05 SUBJECT HEADING: DOUGLAS Model C-54B and C-54 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-39-05 DOUGLAS: (Was Mandatory Note 6 of AD-762-7.) Applies Only to C-54B and Other C-54 Series Airplanes Having the C-54B Fuel System. To be accomplished not later than December 1, 1946. The main fuel line supporting brackets at wing Stations 357, 378, and 399 are subject to vibration failure and are to be replaced with redesigned brackets. In addition, the United Carr clips at wing Station 378 are to be replaced by Adel clips. (Douglas Service Bulletin No. DC-4-5 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_46-39-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 46-39-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54B and C-54 Series Airplanes Subject: Main Fuel Line Supporting Brackets 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 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: 46-39-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 46-39-05 SUBJECT HEADING: DOUGLAS Model C-54B and C-54 Series Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 46-39-05 DOUGLAS: (Was Mandatory Note 6 of AD-762-7.) Applies Only to C-54B and Other C-54 Series Airplanes Having the C-54B Fuel System. To be accomplished not later than December 1, 1946. The main fuel line supporting brackets at wing Stations 357, 378, and 399 are subject to vibration failure and are to be replaced with redesigned brackets. In addition, the United Carr clips at wing Station 378 are to be replaced by Adel clips. (Douglas Service Bulletin No. DC-4-5 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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