AD 48-27-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 149-46 | LOCKHEED Models 49 and 149 Aircraft |
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Models 49 and 149 Aircraft |
Unsafe Condition
Failure to install fuel dump stand pipes could result in fuel overflow during flight, leading to loss of aircraft control.
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Required Actions
Install fuel dump stand pipes as specified in LAC Service Bulletin 49/SB-403 and LAC Service Instruction 49/SI-12 dated September 25, 1946.
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Compliance Time
Not later than next wing change or aircraft overhaul, and in no event later than February 1, 1949.
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Affected Aircraft
Lockheed Aircraft Corporation Models 49 (modified for 93,000 pounds takeoff and 83,000 pounds landing weights) and Model 149 (redesignated from Model 49 and modified for 100,000 pounds takeoff and 83,000 pounds landing weights).
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Federal Register Abstract
Fuel Dump Standpipes
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_48-27-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-27-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49 and 149 Aircraft Subject: Fuel Dump Standpipes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 149-46 | 49-46 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 48-27-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-27-01 SUBJECT HEADING: LOCKHEED Models 49 and 149 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-27-01 LOCKHEED: Applies to All Model 49 Aircraft Modified to Permit Operation at 93,000 Pounds Takeoff and 83,000 Pounds Landing Weights, and Model 49 Aircraft, Redesignated as Model 149, and Modified to Permit 100,000 Pounds Takeoff and 83,000 Pounds Landing Weights. Compliance required not later than next wing change or aircraft overhaul, and in no event later than February 1, 1949. In order to comply with the requirements of Civil Air Regulations, fuel dump stand pipes must be installed. (LAC Service Bulletin 49/SB-403 and LAC Service Instruction 49/SI-12 dated September 25, 1946, cover this same subject.) Pending the accomplishment of the above change, operations are permissible at the increased weights. FOOTER:
Document Text
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AD Final Rules - DRS_48-27-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 48-27-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 49 and 149 Aircraft Subject: Fuel Dump Standpipes Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 149-46 | 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: 48-27-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 48-27-01 SUBJECT HEADING: LOCKHEED Models 49 and 149 Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 48-27-01 LOCKHEED: Applies to All Model 49 Aircraft Modified to Permit Operation at 93,000 Pounds Takeoff and 83,000 Pounds Landing Weights, and Model 49 Aircraft, Redesignated as Model 149, and Modified to Permit 100,000 Pounds Takeoff and 83,000 Pounds Landing Weights. Compliance required not later than next wing change or aircraft overhaul, and in no event later than February 1, 1949. In order to comply with the requirements of Civil Air Regulations, fuel dump stand pipes must be installed. (LAC Service Bulletin 49/SB-403 and LAC Service Instruction 49/SI-12 dated September 25, 1946, cover this same subject.) Pending the accomplishment of the above change, operations are permissible at the increased weights. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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