AD 52-01-03
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 existing damper lever and link assemblies (P/N 47-140-158 and -159) may seize due to insufficient lubrication, leading to bearing failure.
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Required Actions
Replace the existing damper lever and link assemblies (P/N 47-140-158 and -159) with the 47-140-158-1 lever and 47-140-159-1 link assembly to provide adequate lubrication and prevent bearing seizure.
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Compliance Time
next 300-hour overhaul, but not later than March 1, 1952
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Affected Aircraft
Scotts-Bell 47 Inc Model 47B, 47B3, and Model 47D helicopters serial numbers 1 to 100 inclusive
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Federal Register Abstract
Damper Lever and Link
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_52-01-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-01-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters Subject: Damper Lever and Link 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Date: Make: Scotts-Bell 47 Inc Model: 47B | 47B3 | 47D Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-01-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-01-03 SUBJECT HEADING: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-01-03 BELL: Applies to All Models 47B and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 100, Inclusive. Compliance required at next 300-hour overhaul, but not later than March 1, 1952. To provide lubrication to prevent seizing of the bearings, replace the existing damper lever and link assemblies (P/N 47-140-158 and -159) with the 47-140-158-1 lever and 47-140- 159-1 link assembly. (Bell Service Bulletin No. 78 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_52-01-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-01-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters Subject: Damper Lever and Link 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: 52-01-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-01-03 SUBJECT HEADING: Airworthiness Directives; Bell Model 47B and 47B3 and 47D Helicopters ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-01-03 BELL: Applies to All Models 47B and 47B3 Helicopters and to Model 47D Helicopters Serial Numbers 1 to 100, Inclusive. Compliance required at next 300-hour overhaul, but not later than March 1, 1952. To provide lubrication to prevent seizing of the bearings, replace the existing damper lever and link assemblies (P/N 47-140-158 and -159) with the 47-140-158-1 lever and 47-140- 159-1 link assembly. (Bell Service Bulletin No. 78 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
2023-11-07
final ruleAirworthiness Directives; Various Helicopters
Unsafe Condition: unsafe condition on these products.
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96-06-12
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 47-K Helicopters
Unsafe Condition: Inspect Tail Rotor Blade & Abrasion Strip