AD 47-10-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Aluminum alloy bulkhead fittings for fuel, oil, and hydraulic lines and buting with cut-length hose connections in nacelle zones 1 and 2 may fail to provide adequate fire resistance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace aluminum alloy bulkhead fittings with nickel steel or equivalent fire-resistant fittings. Replace buting having cut-length hose connections with flexible coupled hose assemblies in nacelle zones 1 and 2.
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Compliance Time
prior to July 1, 1947
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serial numbers up to and including 2075
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Federal Register Abstract
Fire Resistant Firewall Fittings
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-10-13.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-13 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Fire Resistant Firewall Fittings 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Make: Lockheed Aircraft Corporation Model: 49-46 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-10-13 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-13 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-13 LOCKHEED: (Was Mandatory Note 15 AD-763-3.) Applies to All Model 49 Serials Up to and Including 2075. Compliance required prior to July 1, 1947. (a) On all firewalls, replace aluminum alloy bulkhead fittings for fuel, oil, and hydraulic lines with nickel steel fittings or others of equivalent fire resistance. (LAC Service Bulletin 49/SB-108 covers this same subject.) (b) In nacelle zones 1 and 2 replace all buting having cut-length hose connections with flexible coupled hose assemblies. (LAC Service Bulletin 49/SB-103 covers this same subject.) FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_47-10-13.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-13 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Fire Resistant Firewall Fittings 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: 47-10-13 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-13 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-13 LOCKHEED: (Was Mandatory Note 15 AD-763-3.) Applies to All Model 49 Serials Up to and Including 2075. Compliance required prior to July 1, 1947. (a) On all firewalls, replace aluminum alloy bulkhead fittings for fuel, oil, and hydraulic lines with nickel steel fittings or others of equivalent fire resistance. (LAC Service Bulletin 49/SB-108 covers this same subject.) (b) In nacelle zones 1 and 2 replace all buting having cut-length hose connections with flexible coupled hose assemblies. (LAC Service Bulletin 49/SB-103 covers this same subject.) 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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