AD 76-12-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47E | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters |
Unsafe Condition
Fatigue failure of the tail rotor yoke, Part Number 47-641-057-9, with specified serial numbers (SR29-50501 through SR29-50507, SR-29-50509 through SR29-50528, SR29-50530 through SR29-50533, SR29-50535 through SR29-50537, SR29-50539 through SR29-50544, and SR29-50546 through SR29-50554).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace tail rotor yokes with 390 or more hours' total time in service on the effective date within 10 hours' time in service. Replace those with less than 390 hours' total time prior to accumulating 400 hours' total time in service. Compliance can be achieved via Bell Helicopter Company Service Bulletin 47-05-73-1, Revision A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours' time in service for yokes with 390+ hours on effective date; prior to accumulating 400 hours' total time in service for others.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 helicopters with tail rotor yokes having specified serial numbers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Tail Rotor Yoke
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_76-12-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-12-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters Subject: Tail Rotor Yoke Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/14/1976 Make: Scotts-Bell 47 Inc Model: 47B | 47B3 | 47D | 47D1 | 47E | 47G | 47G-2 | 47H-1 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: 76-12-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2638 AD NUMBER: 76-12-02 SUBJECT HEADING: Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters ACTION: SUMMARY: DATES: Effective July 14, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-12-02 BELL: Amendment 39-2638. Applies to Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 helicopters certificated in all categories. Compliance required as indicated. To prevent possible fatigue failure of the tail rotor yoke, Part Number 47-641-057-9, remove and replace tail rotor yokes having Serial Numbers SR29-50501 through SR29-50507, SR-29-50509 through SR29-50528, SR29-50530 through SR29-50533, SR29-50535 through SR29-50537, SR29-50539 through SR29-50544, and SR29-50546 through SR29-50554, as specified below. (a) Replace those yokes with 390 or more hours' total time in service on the effective date of this AD, within 10 hours' time in service. (b) Replace those yokes with less than 390 hours' total time in service on the effective date of this AD, prior to accumulating 400 hours' total time in service. (c) Compliance with Bell Helicopter Company Service Bulletin Number 47-05-73-1, Revision A, dated November 18, 1975, fulfills compliance with this AD. (d) The requirements of this AD do not affect other Model 47 series helicopter tail rotor yokes. This amendment becomes effective July 14, 1976. FOOTER:
Document Text
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AD Final Rules - DRS_76-12-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 76-12-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters Subject: Tail Rotor Yoke Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 07/14/1976 Make: Scotts-Bell 47 Inc Model: 47B | 47B3 | 47D | 47D1 | 47E | 47G | 47G-2 | 47H-1 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: 76-12-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-2638 AD NUMBER: 76-12-02 SUBJECT HEADING: Airworthiness Directives; Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 Helicopters ACTION: SUMMARY: DATES: Effective July 14, 1976. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 76-12-02 BELL: Amendment 39-2638. Applies to Bell Models 47B, 47B-3, 47D, 47D-1, 47E, 47G, 47G-2, and 47H-1 helicopters certificated in all categories. Compliance required as indicated. To prevent possible fatigue failure of the tail rotor yoke, Part Number 47-641-057-9, remove and replace tail rotor yokes having Serial Numbers SR29-50501 through SR29-50507, SR-29-50509 through SR29-50528, SR29-50530 through SR29-50533, SR29-50535 through SR29-50537, SR29-50539 through SR29-50544, and SR29-50546 through SR29-50554, as specified below. (a) Replace those yokes with 390 or more hours' total time in service on the effective date of this AD, within 10 hours' time in service. (b) Replace those yokes with less than 390 hours' total time in service on the effective date of this AD, prior to accumulating 400 hours' total time in service. (c) Compliance with Bell Helicopter Company Service Bulletin Number 47-05-73-1, Revision A, dated November 18, 1975, fulfills compliance with this AD. (d) The requirements of this AD do not affect other Model 47 series helicopter tail rotor yokes. This amendment becomes effective July 14, 1976. FOOTER:
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Retrieved: Apr 8, 2026
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