AD 70-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 204B | Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A | Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A-1 | Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters |
Unsafe Condition
Failure of the grip assemblies, P/N 204-011-728 or P/N 204-011-706, due to improper hardness or conductivity below Rockwell 79 on the 'B' scale or above conductivity of 39 on International Annealed Copper Standard.
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Required Actions
Inspect all tail rotor grip assemblies for proper hardness or conductivity using Rockwell Hardness, Eddy Current Tester, or Magnatest FM-120 before further flight. Remove grip assemblies with readings below Rockwell 79 or above 39 conductivity. Inspect spare assemblies before installation.
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Compliance Time
before further flight
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Affected Aircraft
Bell Model 204B, 205A, and 205A-1 helicopters with tail rotor hub assemblies P/N 204-011-801-5 or -7, P/N 204-011-701-11, -13, or -19, and spare tail rotor hub assemblies P/N 205-011-801-5 or -7, P/N 204-011-701-11, -13, or -19.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Tail Rotor Grip Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_70-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters Subject: Tail Rotor Grip Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/13/1970 Make: Bell Helicopter Textron, Inc. Model: 204B | 205A | 205A-1 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 70-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-955 AD NUMBER: 70-06-02 SUBJECT HEADING: Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters ACTION: SUMMARY: DATES: Effective March 13, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-06-02 BELL: Amdt. 39-955. Applies to all Model 204B 205A and 205A-1 helicopters and to any other helicopter incorporating tail rotor hub assembly, P/N 204-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19 and to all spare tail rotor hub assemblies P/N 205-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19. Compliance required as indicated. To prevent failure of the grip assemblies, P/N 204-011-728 or P/N 204-011-706, accomplish the following one time inspection on all tail rotor grip assemblies for proper hardness or conductivity before further flight, unless already accomplished after February 27, 1970. These inspections may be conducted with the grips installed on the helicopter. Determine the hardness of the grip assembly using a Rockwell Hardness or Eddy Current Tester, a Magnatest FM-120 (Magnaflux Corp.) or equivalent. Readings should be taken adjacent to vibro etched serial number between the blade retention bolts on grip face. Inspect all spare grip assemblies before installation. Remove grip assemblies with readings below Rockwell 79 on the "B" scale or above conductivity of 39 on International Annealed Copper Standard. This supersedes Amendment 39-953 (AD 70-06-01) issued by telegram dated February 27, 1970. This amendment is effective March 13, 1970, and was effective for all recipients of the telegram dated March 4, 1970 which contained this amendment. FOOTER:
Document Text
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AD Final Rules - DRS_70-06-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 70-06-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters Subject: Tail Rotor Grip Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/13/1970 Make: Bell Helicopter Textron, Inc. Model: 204B | 205A | 205A-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: 70-06-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-955 AD NUMBER: 70-06-02 SUBJECT HEADING: Airworthiness Directives; Bell Model 204B 205A and 205A-1 Helicopters ACTION: SUMMARY: DATES: Effective March 13, 1970. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 70-06-02 BELL: Amdt. 39-955. Applies to all Model 204B 205A and 205A-1 helicopters and to any other helicopter incorporating tail rotor hub assembly, P/N 204-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19 and to all spare tail rotor hub assemblies P/N 205-011-801-5 or -7 or P/N 204-011-701-11, -13 or -19. Compliance required as indicated. To prevent failure of the grip assemblies, P/N 204-011-728 or P/N 204-011-706, accomplish the following one time inspection on all tail rotor grip assemblies for proper hardness or conductivity before further flight, unless already accomplished after February 27, 1970. These inspections may be conducted with the grips installed on the helicopter. Determine the hardness of the grip assembly using a Rockwell Hardness or Eddy Current Tester, a Magnatest FM-120 (Magnaflux Corp.) or equivalent. Readings should be taken adjacent to vibro etched serial number between the blade retention bolts on grip face. Inspect all spare grip assemblies before installation. Remove grip assemblies with readings below Rockwell 79 on the "B" scale or above conductivity of 39 on International Annealed Copper Standard. This supersedes Amendment 39-953 (AD 70-06-01) issued by telegram dated February 27, 1970. This amendment is effective March 13, 1970, and was effective for all recipients of the telegram dated March 4, 1970 which contained this amendment. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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