AD 47-27-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | C54-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | C54A-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | C54B-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | C54D-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | C54E-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | C54G-DC | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
| aircraft | The Boeing Company | DC-4 | DOUGLAS Model C-54-DC Series and DC-4 Airplanes |
Unsafe Condition
Cracks in the spar web structure of the outer wing and center wing section, which may indicate fuel leaks due to cracked spar webs or rivets and seam leaks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect spar web structure for loose rivets, cracks, or irregularities by opening quick-opening inspection doors. Repair cracks using Douglas Drawings 5354811 and 3344236 if found after AD 46-27-01 or in areas not covered by Service Bulletin C-54-205.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at intervals not to exceed 170 hours
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
The Boeing Company models C54-DC, C54A-DC, C54B-DC, C54D-DC, C54E-DC, C54G-DC, and DC-4 airplanes
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Spar Web Structure
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-27-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-27-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54-DC Series and DC-4 Airplanes Subject: Spar Web Structure 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| C54B-DC | C54D-DC | C54E-DC | C54G-DC | DC-4 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 47-27-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-27-02 SUBJECT HEADING: DOUGLAS Model C-54-DC Series and DC-4 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-27-02 DOUGLAS: (Was Service Note 4 of AD-762-7.) Applies to All C-54-DC Series and DC-4 Airplanes. Inspection required at intervals not to exceed 170 hours. Open the quick-opening type inspection doors in the bottom of the outer wing and center wing section surfaces forward of the front spar and aft of the center spar. Inspect spar web structure for loose rivets, cracks, or other irregularities. Pay particular attention in the fuel tank areas for evidence of fuel leaks which will indicate cracked spar webs or rivets and seam leaks. All spar web cracks which are found after accomplishment of AD 46-27-01 (Service Bulletin C-54-205. "Rework - Integral Fuel Tanks") or cracks that are located in areas to which the Service Bulletin C-54-205 does not apply, should be repaired in accordance with Douglas Drawing No. 5354811, "Service Rework-Station 463, Outer Wing, Center Spar", and No. 3344236, "Repair-Integral Tank Spar Web Crack". Revised March 21, 1961. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-27-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-27-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: DOUGLAS Model C-54-DC Series and DC-4 Airplanes Subject: Spar Web Structure 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: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 47-27-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-27-02 SUBJECT HEADING: DOUGLAS Model C-54-DC Series and DC-4 Airplanes ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-27-02 DOUGLAS: (Was Service Note 4 of AD-762-7.) Applies to All C-54-DC Series and DC-4 Airplanes. Inspection required at intervals not to exceed 170 hours. Open the quick-opening type inspection doors in the bottom of the outer wing and center wing section surfaces forward of the front spar and aft of the center spar. Inspect spar web structure for loose rivets, cracks, or other irregularities. Pay particular attention in the fuel tank areas for evidence of fuel leaks which will indicate cracked spar webs or rivets and seam leaks. All spar web cracks which are found after accomplishment of AD 46-27-01 (Service Bulletin C-54-205. "Rework - Integral Fuel Tanks") or cracks that are located in areas to which the Service Bulletin C-54-205 does not apply, should be repaired in accordance with Douglas Drawing No. 5354811, "Service Rework-Station 463, Outer Wing, Center Spar", and No. 3344236, "Repair-Integral Tank Spar Web Crack". Revised March 21, 1961. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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