AD 54-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049-54 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 1049B-55 (Navy R7V-1) | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 149-46 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 49-46 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 649-79 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 649A-79 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 749-79 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. |
Unsafe Condition
Failures of Bendix No. 405308 main landing gear actuating cylinder assembly may result in flight hazards due to inability to actuate the landing gear.
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Required Actions
Replace the cylinders with Bendix designs incorporating a 3/16-inch radius in the barrel, or rework existing cylinders by providing a 3/32-inch relief radius at the barrel bore relief area and bottom of the barrel, spot-peen the radius area, and magnetically inspect the barrel internally and externally before and after rework. If the barrel is cracked, it must be scrapped.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
no later than the next regularly scheduled landing gear overhaul
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Affected Aircraft
Lockheed Models 49, 149, 649, 749, and 1049 Aircraft
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Main Landing Gear Actuating Cylinder Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_54-24-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-24-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. Subject: Main Landing Gear Actuating Cylinder Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 149-46 | 49-46 | 649-79 | 649A-79...Show more 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: 54-24-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-24-03 SUBJECT HEADING: Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-24-03 LOCKHEED: Applies to All Models 49, 149, 649, 749, and 1049 Aircraft. Compliance required no later than the next regularly scheduled landing gear overhaul for all subject type aircraft. Failures of Bendix No. 405308 main landing gear actuating cylinder assembly are continuing to occur and may result in flight hazards due to inability to actuate the landing gear. Bendix Pacific Division issued their Service Bulletin No. 71 dated December 26, 1952, for rework and inspection of these assemblies. Lockheed has written to all operators, August 20, 1954, specifying additional rework. It is necessary, in order to increase service life of these cylinders, to either replace them with cylinders of the new Bendix design (which incorporate a 3/16-inch radius in the barrel) or to accomplish the following: 1. Rework cylinder assemblies 405308-0-1, -0-2, -0-3, -0-4, -0-5 and -1 to provide a 3/32-inch relief radius at the juncture of the barrel bore relief area and bottom of the barrel, and to spot-peen this 3/32-inch radius area. 2. Magnetically inspect the barrel internally and externally prior to and following the rework per item 1. If the barrel is cracked, it must be scrapped. (Bendix Service Bulletin No. 71 and Lockheed Letter FS/93931 to operators dated August 20, 1954, covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_54-24-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-24-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. Subject: Main Landing Gear Actuating Cylinder Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049-54 | 1049B-55 (Navy R7V-1) | 1049C-55 | 1049D-55 | 1049E-55 | 149-46 | 49-46 | 649-79 | 649A-79...Show more 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: 54-24-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-24-03 SUBJECT HEADING: Airworthiness Directives; LOCKHEED Models 49, 149, 649, 749, and 1049 Aircraft. ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-24-03 LOCKHEED: Applies to All Models 49, 149, 649, 749, and 1049 Aircraft. Compliance required no later than the next regularly scheduled landing gear overhaul for all subject type aircraft. Failures of Bendix No. 405308 main landing gear actuating cylinder assembly are continuing to occur and may result in flight hazards due to inability to actuate the landing gear. Bendix Pacific Division issued their Service Bulletin No. 71 dated December 26, 1952, for rework and inspection of these assemblies. Lockheed has written to all operators, August 20, 1954, specifying additional rework. It is necessary, in order to increase service life of these cylinders, to either replace them with cylinders of the new Bendix design (which incorporate a 3/16-inch radius in the barrel) or to accomplish the following: 1. Rework cylinder assemblies 405308-0-1, -0-2, -0-3, -0-4, -0-5 and -1 to provide a 3/32-inch relief radius at the juncture of the barrel bore relief area and bottom of the barrel, and to spot-peen this 3/32-inch radius area. 2. Magnetically inspect the barrel internally and externally prior to and following the rework per item 1. If the barrel is cracked, it must be scrapped. (Bendix Service Bulletin No. 71 and Lockheed Letter FS/93931 to operators dated August 20, 1954, covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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