AD 59-18-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049G-82 | LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft |
| aircraft | Lockheed Aircraft Corporation | 1049H-82 | LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft |
Unsafe Condition
Cracking in the inner wing rear spar web at Wing Station 458 in the upper and lower notched web area.
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Required Actions
Inspect the inner wing rear spar web at Station 458 for cracks in the upper and lower notched web area. If cracks are found, incorporate the reinforcements shown in Lockheed Drawing 555353. If no cracks are found, reinforcements may be incorporated or reinspect at 4,000 flight-hour periods or block overhaul intervals.
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Compliance Time
At the next block overhaul or 4,000 flight-hours, whichever occurs first
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Affected Aircraft
Lockheed Models 1049C, 1049D, 1049E, 1049G, and 1049H Aircraft
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Federal Register Abstract
Wing Spar Web Reinforcement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_59-18-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-18-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft Subject: Wing Spar Web Reinforcement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049C-55 | 1049D-55 | 1049E-55 | 1049G-82 | 1049H-82 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 59-18-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-18-04 SUBJECT HEADING: LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-18-04 LOCKHEED: Applies to All Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft. Compliance required as indicated. The following inspections have been established as a result of recently found cracking in the inner wing rear spar web at Wing Station 458. At the next block overhaul or 4,000 flight-hours, whichever occurs first, on all aircraft (regardless of accumulated flight time) inspect the inner wing rear spar web at Station 458 for cracks in the upper and lower notched web area shown in Lockheed Drawing 555353. Inspection is applicable to both left and right wings. If cracks are discovered incorporate the reinforcements shown in Lockheed Drawing 555353, or equivalent. If no cracks are discovered, the reinforcements shown in Lockheed Drawing 555353 may be incorporated. Otherwise, reinspection at 4,000 flight-hour periods or block overhaul, whichever is less, is required to insure detection of cracks. (Lockheed Service Letter FS/231094 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_59-18-04.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 59-18-04 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft Subject: Wing Spar Web Reinforcement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049C-55 | 1049D-55 | 1049E-55 | 1049G-82 | 1049H-82 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: 59-18-04 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 59-18-04 SUBJECT HEADING: LOCKHEED Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 59-18-04 LOCKHEED: Applies to All Models 1049C, 1049D, 1049E, 1049G and 1049H Aircraft. Compliance required as indicated. The following inspections have been established as a result of recently found cracking in the inner wing rear spar web at Wing Station 458. At the next block overhaul or 4,000 flight-hours, whichever occurs first, on all aircraft (regardless of accumulated flight time) inspect the inner wing rear spar web at Station 458 for cracks in the upper and lower notched web area shown in Lockheed Drawing 555353. Inspection is applicable to both left and right wings. If cracks are discovered incorporate the reinforcements shown in Lockheed Drawing 555353, or equivalent. If no cracks are discovered, the reinforcements shown in Lockheed Drawing 555353 may be incorporated. Otherwise, reinspection at 4,000 flight-hour periods or block overhaul, whichever is less, is required to insure detection of cracks. (Lockheed Service Letter FS/231094 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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