AD 47-49-11
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
Loose fuel dump valve shaft gland nuts and valves on drain lines, crossfeed lines, and cabin heater fuel lines could permit leakage or hazardous conditions.
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Required Actions
Inspect fuel dump valve shaft gland nuts (serials up to 2075) and valves on drain lines, crossfeed lines, and cabin heater fuel lines (serials 2047-2088 and 2501-2503) at intervals not exceeding 50 hours of operation to ensure they are tight. Safety wiring may discontinue inspections.
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Compliance Time
At periods not to exceed 50 hours of operation
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Affected Aircraft
Lockheed Models 49, 649, and 749 with serial numbers up to 2075 for part (a), and serials 2047-2088, 2501-2503 for part (b)
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Federal Register Abstract
Fuel System Inspection
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-49-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-49-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, and 749 Subject: Fuel System Inspection 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Aircraft Corporation Model: 49-46 | 649-79 | 749-79 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185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: 47-49-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-49-11 SUBJECT HEADING: LOCKHEED Models 49, 649, and 749 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-49-11 LOCKHEED: (Was Service Note 11 of AD-763-3.) Applies to Models 49, 649, and 749 Serials as Noted. At periods not to exceed 50 hours of operation, inspect the following fuel system elements to determine that they are tight and will not permit leakage or other hazardous conditions: (a) Fuel dump valve shaft gland nuts (Serials up to and including 2075). (b) Valves on drain lines from outboard portion of inboard fuel tanks, fuel system crossfeed lines, and cabin heater fuel lines (Serials 2047 to 2088, inclusive, and 2501 to 2503, inclusive). If safety wiring of these items is provided, the required inspections may be discontinued. (Lockheed Service Bulletin 49/SB-215 covers part (a), and Lockheed Service Instruction 49/SI-10A covers part (b).) FOOTER:
Document Text
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AD Final Rules - DRS_47-49-11.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-49-11 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49, 649, and 749 Subject: Fuel System Inspection 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: 47-49-11 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-49-11 SUBJECT HEADING: LOCKHEED Models 49, 649, and 749 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-49-11 LOCKHEED: (Was Service Note 11 of AD-763-3.) Applies to Models 49, 649, and 749 Serials as Noted. At periods not to exceed 50 hours of operation, inspect the following fuel system elements to determine that they are tight and will not permit leakage or other hazardous conditions: (a) Fuel dump valve shaft gland nuts (Serials up to and including 2075). (b) Valves on drain lines from outboard portion of inboard fuel tanks, fuel system crossfeed lines, and cabin heater fuel lines (Serials 2047 to 2088, inclusive, and 2501 to 2503, inclusive). If safety wiring of these items is provided, the required inspections may be discontinued. (Lockheed Service Bulletin 49/SB-215 covers part (a), and Lockheed Service Instruction 49/SI-10A covers part (b).) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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