AD 65-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Scotts-Bell 47 Inc | 47 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47B3 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47D1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47E | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-2A-1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-3 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-3B | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-3B-1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-3B-2 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-3B-2A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-4 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-4A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-5 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47G-5A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47H-1 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47J | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47J-2 | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47J-2A | Airworthiness Directives; Bell Model 47 Series Helicopters |
| aircraft | Scotts-Bell 47 Inc | 47K | Airworthiness Directives; Bell Model 47 Series Helicopters |
Unsafe Condition
Some P/N 47-620-535-1 outer races installed in the freewheeling clutch may not have been tempered properly, leading to excessive wear and subsequent malfunction of the freewheeling clutch.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Conduct a hardness test on the outer races as described by Bell Service Bulletin No. 141SB. Replace the outer race with one within the hardness limits before further flight if the test fails.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 25 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Scotts-Bell 47 Inc Model 47 Series Helicopters equipped with transmissions serial numbers B12-885 through B12-969
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Freewheeling Clutch
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_65-04-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 65-04-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47 Series Helicopters Subject: Freewheeling Clutch Status: Current Citation: Federal Register: February 17, 1965 Citation Publish Date: 02/17/1965 Effective Date: 02/17/1965 Make: Scotts-Bell 47 Inc Model: 47 | 47B | 47B3 | 47D | 47D1 | 47E | 47G | 47G-2 | 47G-2A | 47G-2A-1 | 47G-3 | 47G-3B | 47G-3B-1 | 4...Show more 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: 65-04-01 CITATION: [Federal Register: February 17, 1965] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-36 AD NUMBER: 65-04-01 SUBJECT HEADING: Airworthiness Directives; Bell Model 47 Series Helicopters ACTION: SUMMARY: DATES: Effective February 17, 1965. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 65-04-01 BELL: Amdt. 39-36 Part 39 Federal Register February 17, 1965. Applies to Model 47 Series Helicopters Equipped With Transmissions Serial Numbers B12-885 through B12-969. Compliance required within 25 hours' time in service after the effective date of this AD, unless previously accomplished in accordance with Bell Helicopter Company Service Bulletin No. 141SB. Some of the P/N 47-620-535-1 outer races installed in the freewheeling clutch of transmissions listed herein may not have been tempered properly. To eliminate the possibility of excessive wear of these races and subsequent malfunction of the freewheeling clutch, conduct a hardness test on these races as described by Bell Service Bulletin No. 141SB. If the hardness does not fall within the limits prescribed by the bulletin, replace the outer race with one which is within the limits before further flight. This directive effective February 17, 1965. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_65-04-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 65-04-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47 Series Helicopters Subject: Freewheeling Clutch Status: Current Citation: Federal Register: February 17, 1965 Citation Publish Date: 02/17/1965 Effective Date: 02/17/1965 Make: Scotts-Bell 47 Inc Model: 47 | 47B | 47B3 | 47D | 47D1 | 47E | 47G | 47G-2 | 47G-2A | 47G-2A-1 | 47G-3 | 47G-3B | 47G-3B-1 | 4...Show more 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: 65-04-01 CITATION: [Federal Register: February 17, 1965] PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-36 AD NUMBER: 65-04-01 SUBJECT HEADING: Airworthiness Directives; Bell Model 47 Series Helicopters ACTION: SUMMARY: DATES: Effective February 17, 1965. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 65-04-01 BELL: Amdt. 39-36 Part 39 Federal Register February 17, 1965. Applies to Model 47 Series Helicopters Equipped With Transmissions Serial Numbers B12-885 through B12-969. Compliance required within 25 hours' time in service after the effective date of this AD, unless previously accomplished in accordance with Bell Helicopter Company Service Bulletin No. 141SB. Some of the P/N 47-620-535-1 outer races installed in the freewheeling clutch of transmissions listed herein may not have been tempered properly. To eliminate the possibility of excessive wear of these races and subsequent malfunction of the freewheeling clutch, conduct a hardness test on these races as described by Bell Service Bulletin No. 141SB. If the hardness does not fall within the limits prescribed by the bulletin, replace the outer race with one which is within the limits before further flight. This directive effective February 17, 1965. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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