AD 52-01-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters |
Unsafe Condition
The tail rotor blade grip retaining bolt may fail due to insufficient service life, leading to blade detachment.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the existing 47-641-026-1 bolt with the 47-641-052-1 bolt and torque to 160-190 inch-pounds. Replace the 47-641-036-1 flat washer type micarta seal with the 47-641-042-1 cup seal type on Models 47B and 47B3.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
next 300-hour overhaul, but not later than March 1, 1952
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Scotts-Bell 47 Inc Model 47B and 47B3 helicopters and Model 47D helicopters serial numbers 1 to 110, inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Rotor Blade Grip Retaining Bolt
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_52-01-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-01-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters Subject: Rotor Blade Grip Retaining Bolt Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Scotts-Bell 47 Inc Model: 47B | 47B3 | 47D Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-01-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-01-05 SUBJECT HEADING: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-01-05 BELL: Applies to All Models 47B and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 110, Inclusive. Compliance required at next 300-hour overhaul, but not later than March 1, 1952. To provide a tail rotor blade grip retaining bolt of increased service life, replace each existing 47-641-026-1 bolt with the 47-641-052-1 bolt, and torque to 160-190 inch-pounds. Also, replace the 47-641-036-1 flat washer type micarta seal in the blade yoke on Models 47B and 47B3 helicopters with the 47-641-042-1 cup seal type. (Bell Service Bulletin No. 80 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_52-01-05.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-01-05 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters Subject: Rotor Blade Grip Retaining Bolt Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Scotts-Bell 47 Inc Model: 47B | 47B3 | 47D 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: 52-01-05 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-01-05 SUBJECT HEADING: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-01-05 BELL: Applies to All Models 47B and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 110, Inclusive. Compliance required at next 300-hour overhaul, but not later than March 1, 1952. To provide a tail rotor blade grip retaining bolt of increased service life, replace each existing 47-641-026-1 bolt with the 47-641-052-1 bolt, and torque to 160-190 inch-pounds. Also, replace the 47-641-036-1 flat washer type micarta seal in the blade yoke on Models 47B and 47B3 helicopters with the 47-641-042-1 cup seal type. (Bell Service Bulletin No. 80 covers this 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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Unsafe Condition: Inspect Tail Rotor Blade & Abrasion Strip