AD 50-06-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47D1 Helicopters |
Unsafe Condition
Fatigue failures in the ventral fin installation Bell P/N 47-267-058
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace ventral fin installation Bell P/N 47-267-058 with revised ventral fin and fixed tab installation Bell P/N 47-267-063. Discontinue inspections required by AD 49-34-02 after completion.
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Compliance Time
not later than March 31, 1950
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Affected Aircraft
Scotts-Bell 47 Inc Model 47D1 helicopters
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Federal Register Abstract
Ventral Fin Replacement
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_50-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47D1 Helicopters Subject: Ventral Fin Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Scotts-Bell 47 Inc Model: 47D1 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 50-06-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-06-01 SUBJECT HEADING: Airworthiness Directives; Bell Model 47D1 Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-06-01 BELL: Applies to All Model 47D1 Helicopters. Compliance required not later than March 31, 1950. Ventral fin installation, Bell P/N 47-267-058 should be replaced by the revised ventral fin and fixed tab installation, Bell P/N 47-267-063. The new installation is designed to eliminate the possibility of those fatigue failures which have been experienced in the old design. Upon completion of the above modifications, the inspections required by AD 49-34-02 may be discontinued. (Bell Service Bulletin No. 71 covers the same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_50-06-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 50-06-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47D1 Helicopters Subject: Ventral Fin Replacement Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Scotts-Bell 47 Inc Model: 47D1 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 50-06-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 50-06-01 SUBJECT HEADING: Airworthiness Directives; Bell Model 47D1 Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 50-06-01 BELL: Applies to All Model 47D1 Helicopters. Compliance required not later than March 31, 1950. Ventral fin installation, Bell P/N 47-267-058 should be replaced by the revised ventral fin and fixed tab installation, Bell P/N 47-267-063. The new installation is designed to eliminate the possibility of those fatigue failures which have been experienced in the old design. Upon completion of the above modifications, the inspections required by AD 49-34-02 may be discontinued. (Bell Service Bulletin No. 71 covers the 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.
Related Airworthiness Directives
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final ruleAirworthiness Directives; Various Helicopters
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final ruleAirworthiness Directives; Bell Helicopter Textron, Inc. Model 47B, 47B-3, 47D, 47D-1, 47G, 47G-2, 47G-2A, 47G-2A-1, 47G-3, 47G-3B, 47G-3B-1, 47G-3B-2, 47G-3B-2A, 47G-4, 47G-4A, 47G-5, 47G-5A, 47H-1, 47J, 47J-2, 47J-2A, and 47K Helicopters
Unsafe Condition: Failure of the stabilizer bar damper link assembly due to separation of the damper link if the damper link rod end bushing loosens and exits the damper link rod end.