AD 54-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 1049C-55 | LOCKHEED Models 1049C, 1049E, and 1049D |
| aircraft | Lockheed Aircraft Corporation | 1049D-55 | LOCKHEED Models 1049C, 1049E, and 1049D |
| aircraft | Lockheed Aircraft Corporation | 1049E-55 | LOCKHEED Models 1049C, 1049E, and 1049D |
Unsafe Condition
Cracks in the outer wing main beam web between Stations 551 and 637, left and right, which may not be detectable by inspection for fuel stains alone due to sealant on the tank surface.
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Required Actions
Perform a visual inspection for cracks between Stations 551 and 637, left and right, as soon as practical and reinspect every 125 hours until reinforced. Reinforce the area with extruded aluminum alloy stiffeners (LS347-3) as soon as possible but not later than 1,000 hours after receipt of parts or March 1, 1955, whichever comes first.
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Compliance Time
As soon as practical for initial inspection; reinspect at intervals of approximately 125 hours until reinforced. Reinforcement must be completed not later than 1,000 hours after receipt of parts from the manufacturer or March 1, 1955, whichever occurs first.
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Affected Aircraft
Lockheed Models 1049C (Serial Numbers 4520-4548), 1049E (Serial Numbers 4549-4556, 4558-4560, 4563-4565), and 1049D (Serial Numbers 4163-4166).
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Federal Register Abstract
Wing Main Beam Web Inspection
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_54-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 1049C, 1049E, and 1049D Subject: Wing Main Beam Web Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049C-55 | 1049D-55 | 1049E-55 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 54-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-24-02 SUBJECT HEADING: LOCKHEED Models 1049C, 1049E, and 1049D ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-24-02 LOCKHEED: Applies to 1049C, Serial Numbers 4520 Through 4548; Model 1049E, Serial Numbers 4549 Through 4556, 4558 Through 4560, and 4563 Through 4565; Model 1049D, Serial Numbers 4163 Through 4166. Compliance required as indicated. 1. Perform a visual inspection of the outer wing main beam web between Stations 551 and 637, left and right, for cracks as soon as practical, and reinspect at intervals of approximately 125 hours until this area is reinforced as outlined in paragraph 2. If cracks are found repair and reinforce as per paragraph 2 immediately. Inspection for fuel stains alone as an indication of a crack is not sufficient due to the presence of sealant on the inside of the tank surface. 2. Reinforce the main beam web between wing Stations 551 and 637, left and right as soon as possible, convenient with aircraft check periods, but not later than 1,000 hours after receipt of parts from the manufacturer or March 1, 1955, whichever occurs first. This may be accomplished by the addition of extruded aluminum alloy (75ST6) stiffeners (LS347-3), one between each of the original stiffeners in this area. (Lockheed Service Bulletin No. 1049/SB-2559 describes this reinforcement.) FOOTER:
Document Text
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AD Final Rules - DRS_54-24-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 54-24-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Models 1049C, 1049E, and 1049D Subject: Wing Main Beam Web Inspection Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 1049C-55 | 1049D-55 | 1049E-55 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: 54-24-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 54-24-02 SUBJECT HEADING: LOCKHEED Models 1049C, 1049E, and 1049D ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 54-24-02 LOCKHEED: Applies to 1049C, Serial Numbers 4520 Through 4548; Model 1049E, Serial Numbers 4549 Through 4556, 4558 Through 4560, and 4563 Through 4565; Model 1049D, Serial Numbers 4163 Through 4166. Compliance required as indicated. 1. Perform a visual inspection of the outer wing main beam web between Stations 551 and 637, left and right, for cracks as soon as practical, and reinspect at intervals of approximately 125 hours until this area is reinforced as outlined in paragraph 2. If cracks are found repair and reinforce as per paragraph 2 immediately. Inspection for fuel stains alone as an indication of a crack is not sufficient due to the presence of sealant on the inside of the tank surface. 2. Reinforce the main beam web between wing Stations 551 and 637, left and right as soon as possible, convenient with aircraft check periods, but not later than 1,000 hours after receipt of parts from the manufacturer or March 1, 1955, whichever occurs first. This may be accomplished by the addition of extruded aluminum alloy (75ST6) stiffeners (LS347-3), one between each of the original stiffeners in this area. (Lockheed Service Bulletin No. 1049/SB-2559 describes this reinforcement.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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