AD 84-08-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Sikorsky Aircraft Corporation | S-76A | Airworthiness Directives; SIKORSKY AIRCRAFT DIVISION Model S-76A Helicopters |
Unsafe Condition
Failure of the tail rotor pitch control shaft bearing assembly and subsequent partial loss of directional control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the tail rotor pitch control shaft bearing assembly for axial movement in accordance with specified service bulletins or equivalent procedures. Replace the assembly if axial movement exceeds 0.010 inch as per the same procedures.
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 unless already accomplished within the last 75 hours time in service and thereafter at intervals not to exceed 100 hours time in service from the last inspection.
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Affected Aircraft
Sikorsky Model S-76A helicopters equipped with Part Number 76000-05100-043 or -045 tail rotor pitch control shaft assemblies.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Shaft Bearing Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_84-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SIKORSKY AIRCRAFT DIVISION Model S-76A Helicopters Subject: Shaft Bearing Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/24/1984 Make: Sikorsky Aircraft Corporation Model: S-76A Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 84-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4846 AD NUMBER: 84-08-01 SUBJECT HEADING: Airworthiness Directives; SIKORSKY AIRCRAFT DIVISION Model S-76A Helicopters ACTION: SUMMARY: DATES: Effective April 24, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-08-01 SIKORSKY AIRCRAFT DIVISION: Amendment 39-4846. Applies to all Sikorsky Model S-76A helicopters, certificated in all categories, that are equipped with Part Number (P/N) 76000-05100-043, or -045 tail rotor pitch control shaft assemblies. Compliance is required within 25 hours time in service after the effective date of this AD unless already accomplished within the last 75 hours time in service and thereafter at intervals not to exceed 100 hours time in service from the last inspection. To prevent possible failure of the tail rotor pitch control shaft bearing assembly and subsequent partial loss of directional control of the helicopter, accomplish the following: (a) Inspect the tail rotor pitch control shaft bearing assembly for axial movement in accordance with Paragraph E of Sikorsky Alert Service Bulletin (ASB) No. 76-66-18, as revised by ASB No. 76-66-18A, or with an equivalent procedure approved under paragraph (c) of this AD. (b) If the control shaft assembly axial movement exceeds 0.010 inch, replace with a serviceable assembly in accordance with Paragraph E of Sikorsky ASB No. 76-66-18, as revised by ASB No. 76-66-18A, or with an equivalent procedure approved under paragraph (c) of this AD. (c) Upon submission of substantiating data and upon request by an owner or operator through an FAA maintenance inspector, the repetitive inspection interval of this AD may be adjusted and an equivalent method of compliance with this AD may be approved by the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone number (617) 273-7329. (Sikorsky S-76 Maintenance Manual SA 4047-76-2-1, 5-20-00, Item No. 22, page 30A, March 12, 1984, pertains to the repetitive inspection.) This amendment becomes effective April 24, 1984. FOOTER:
Document Text
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AD Final Rules - DRS_84-08-01.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 84-08-01 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; SIKORSKY AIRCRAFT DIVISION Model S-76A Helicopters Subject: Shaft Bearing Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/24/1984 Make: Sikorsky Aircraft Corporation Model: S-76A 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: 84-08-01 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4846 AD NUMBER: 84-08-01 SUBJECT HEADING: Airworthiness Directives; SIKORSKY AIRCRAFT DIVISION Model S-76A Helicopters ACTION: SUMMARY: DATES: Effective April 24, 1984. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 84-08-01 SIKORSKY AIRCRAFT DIVISION: Amendment 39-4846. Applies to all Sikorsky Model S-76A helicopters, certificated in all categories, that are equipped with Part Number (P/N) 76000-05100-043, or -045 tail rotor pitch control shaft assemblies. Compliance is required within 25 hours time in service after the effective date of this AD unless already accomplished within the last 75 hours time in service and thereafter at intervals not to exceed 100 hours time in service from the last inspection. To prevent possible failure of the tail rotor pitch control shaft bearing assembly and subsequent partial loss of directional control of the helicopter, accomplish the following: (a) Inspect the tail rotor pitch control shaft bearing assembly for axial movement in accordance with Paragraph E of Sikorsky Alert Service Bulletin (ASB) No. 76-66-18, as revised by ASB No. 76-66-18A, or with an equivalent procedure approved under paragraph (c) of this AD. (b) If the control shaft assembly axial movement exceeds 0.010 inch, replace with a serviceable assembly in accordance with Paragraph E of Sikorsky ASB No. 76-66-18, as revised by ASB No. 76-66-18A, or with an equivalent procedure approved under paragraph (c) of this AD. (c) Upon submission of substantiating data and upon request by an owner or operator through an FAA maintenance inspector, the repetitive inspection interval of this AD may be adjusted and an equivalent method of compliance with this AD may be approved by the Manager, Boston Aircraft Certification Office, 12 New England Executive Park, Burlington, Massachusetts 01803, telephone number (617) 273-7329. (Sikorsky S-76 Maintenance Manual SA 4047-76-2-1, 5-20-00, Item No. 22, page 30A, March 12, 1984, pertains to the repetitive inspection.) This amendment becomes effective April 24, 1984. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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