AD 47-10-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Failure of the engine oil lines to have seal plates and cover plates on the alternate oil line cutouts in the engine fire seals could result in uncontained engine failure and fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Add seal plates to engine oil lines passing through engine fire seals and install cover plates on alternate oil line cutouts during engine replacement in quick-change powerplant units.
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Compliance Time
after each engine change
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serial numbers up to and including 2088
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Federal Register Abstract
Oil Line Cover Plates
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-10-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Oil Line Cover Plates Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-10-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-09 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-09 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088. Compliance required after each engine change. When found necessary as a result of engine replacement in a quick-change powerplant unit, add seal plates to the engine oil lines where they pass through the engine fire seals, and add cover plates to the alternate oil line cutouts in the fire seals. (LAC Service Instruction 49/51-39 and LAC Service Bulletin 49/SB-63 cover this same subject for Models 49-51 and 49-46, respectively.) FOOTER:
Document Text
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AD Final Rules - DRS_47-10-09.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-09 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Oil Line Cover Plates Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 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: 47-10-09 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-09 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-09 LOCKHEED: (Was Mandatory Note 8 of AD-763-3.) Applies to All Model 49 Serials Up to and Including 2088. Compliance required after each engine change. When found necessary as a result of engine replacement in a quick-change powerplant unit, add seal plates to the engine oil lines where they pass through the engine fire seals, and add cover plates to the alternate oil line cutouts in the fire seals. (LAC Service Instruction 49/51-39 and LAC Service Bulletin 49/SB-63 cover this same subject for Models 49-51 and 49-46, respectively.) 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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