AD 47-49-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49, 649, and 749 |
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 49, 649, and 749 |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 49, 649, and 749 |
Unsafe Condition
Cracks in the vicinity of the forward hinge attachments of the metal aft doors of the main landing gear.
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Required Actions
Inspect the metal aft doors of the main landing gear for signs of cracks in the vicinity of the forward hinge attachments at periods not to exceed 250 hours. Install satisfactory reinforcements and doublers when cracks are found. Discontinue inspections after installing doublers if doors are not cracked.
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Compliance Time
at periods not to exceed 250 hours
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Affected Aircraft
Lockheed Aircraft Corporation Models 49, 649, and 749 serials incorporating Short Type Metal Aft Doors for the Main Landing Gear.
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Federal Register Abstract
Landing Gear Doors
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-49-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-49-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, and 749 Subject: Landing Gear Doors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 | 649-79 | 749-79 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185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: 47-49-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-49-12 SUBJECT HEADING: LOCKHEED Models 49, 649, and 749 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-49-12 LOCKHEED: (Was Service Note 12 of AD-763-3.) Applies to All Models 49, 649, and 749 Serials Which Incorporate Short Type Metal Aft Doors for the Main Landing Gear. At periods not to exceed 250 hours inspect the metal aft doors of the main landing gear for signs of cracks in the vicinity of the forward hinge attachments. When cracks are found, satisfactory reinforcements and doublers should be installed. When doublers have been installed (doublers only are necessary if the doors are not already cracked) the periodic inspections may be discontinued. (LAC Service Bulletin 49/SB-274 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_47-49-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-49-12 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, and 749 Subject: Landing Gear Doors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 | 649-79 | 749-79 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: 47-49-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-49-12 SUBJECT HEADING: LOCKHEED Models 49, 649, and 749 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-49-12 LOCKHEED: (Was Service Note 12 of AD-763-3.) Applies to All Models 49, 649, and 749 Serials Which Incorporate Short Type Metal Aft Doors for the Main Landing Gear. At periods not to exceed 250 hours inspect the metal aft doors of the main landing gear for signs of cracks in the vicinity of the forward hinge attachments. When cracks are found, satisfactory reinforcements and doublers should be installed. When doublers have been installed (doublers only are necessary if the doors are not already cracked) the periodic inspections may be discontinued. (LAC Service Bulletin 49/SB-274 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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