AD 52-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 18 | LOCKHEED Model 18 Aircraft |
Unsafe Condition
Failure to seal the inboard end of the integral fuel tanks as per Lockheed Drawing No. 50829, change A, could allow gasoline fumes to accumulate in the passenger compartment in case of fuel tank leakage.
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Required Actions
Inspect Model 18 Series aircraft converted from military to civil status for compliance with Lockheed Drawing No. 50829, change A. Install diaphragms and vents as required by the drawing. Remove overhead or floor panels to access the area for inspection.
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Compliance Time
next annual inspection, but in no event later than June 1, 1953
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Affected Aircraft
Lockheed Aircraft Corporation Model 18 aircraft designated C57, C57B, R50-1, R50-2, R50-3, R50-5, R50-6, C60, C60A, and C59, converted from military versions to civil status
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Federal Register Abstract
Fuel Tank Seal
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_52-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 18 Aircraft Subject: Fuel Tank Seal Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 18 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-08-01 SUBJECT HEADING: LOCKHEED Model 18 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-08-01 LOCKHEED: Applies to Certificated Army and Navy Versions of the Model 18 Aircraft Designated C57, C57B, R50-1, R50-2, R50-3, R50-5, R50-6, C60, C60A and C59. Compliance required at next annual inspection, but in no event later than June 1, 1953. Inspect all Lockheed Model 18 Series aircraft which have been converted from a military version to civil status, for compliance with Lockheed Drawing No. 50829, change A, to provide seal at the inboard end of the integral fuel tanks (inside fuselage) to prevent gasoline fumes from accumulating in the passenger compartment in case of fuel tank leakage. Inspection of the area can be accomplished by removal of the overhead panels adjacent to the fuselage skin in the No. 3 and No. 4 baggage compartments or by removing floor panels in the cabin. Diaphragms and vents must be installed in accordance with Lockheed Drawing No. 50829 (or equivalent). (Drawing No. 50829, change A, covering the required installation may be obtained from Lockheed Aircraft Corp., Burbank, Calif.) FOOTER:
Document Text
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AD Final Rules - DRS_52-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 18 Aircraft Subject: Fuel Tank Seal Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 18 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: 52-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-08-01 SUBJECT HEADING: LOCKHEED Model 18 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-08-01 LOCKHEED: Applies to Certificated Army and Navy Versions of the Model 18 Aircraft Designated C57, C57B, R50-1, R50-2, R50-3, R50-5, R50-6, C60, C60A and C59. Compliance required at next annual inspection, but in no event later than June 1, 1953. Inspect all Lockheed Model 18 Series aircraft which have been converted from a military version to civil status, for compliance with Lockheed Drawing No. 50829, change A, to provide seal at the inboard end of the integral fuel tanks (inside fuselage) to prevent gasoline fumes from accumulating in the passenger compartment in case of fuel tank leakage. Inspection of the area can be accomplished by removal of the overhead panels adjacent to the fuselage skin in the No. 3 and No. 4 baggage compartments or by removing floor panels in the cabin. Diaphragms and vents must be installed in accordance with Lockheed Drawing No. 50829 (or equivalent). (Drawing No. 50829, change A, covering the required installation may be obtained from Lockheed Aircraft Corp., Burbank, Calif.) FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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