AD 81-02-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters |
Unsafe Condition
Clutch failure resulting in loss of engine power to the main rotor.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove P/N 214-040-021-001 clutch assemblies and install P/N 214-040-021-103 assemblies according to specified schedules. Compliance must be accomplished within 10 hours' time in service for assemblies with 290+ hours or unknown time, and prior to 300 hours' time in service for those with less than 290 hours.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours' time in service for P/N 214-040-021-001 assemblies with 290 or more hours' time in service or unknown time on the effective date. Prior to attaining 300 hours' time in service for those with less than 290 hours' time in service on the effective date.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron, Inc. Models 214B and 214B-1 helicopters, serial numbers up to and including S/N 28049.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Clutch Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_81-02-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-02-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters Subject: Clutch Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/26/1981 Make: Bell Helicopter Textron, Inc. Model: 214B | 214B-1 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 81-02-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4025 AD NUMBER: 81-02-10 SUBJECT HEADING: Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters ACTION: SUMMARY: DATES: Effective January 26, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-02-10 BELL: Amendment 39-4025. Applies to Models 214B and 214B-1 helicopters, serial numbers up to and including S/N 28049. Compliance is required as indicated unless already accomplished. To prevent a clutch failure which will result in the loss of engine power to the main rotor, accomplish the following: (a) The freewheeling clutch assembly, P/N 214-040-021-001, must be removed from service and P/N 214-040-021-103 clutch assembly installed according to the following schedule; (1) P/N 214-040-021-001 clutch assemblies with 290 or more hours' time in service on the effective date of this AD must be removed from service within the next 10 hours' time in service. (2) P/N 214-040-021-001 clutch assemblies with less than 290 hours' time in service on the effective date of this AD must be removed from service prior to attaining 300 hours' time in service. (3) P/N 214-040-021-001 clutch assemblies with unknown time in service must be removed within the next ten hours' time in service. NOTE: BHT Alert Service Bulletin No. 214-80-13, dated August 22, 1980, pertains to this subject. (b) Special flight permits may be issued in accordance with FAR 21.197 and FAR 21.199 to fly aircraft to a base where this AD can be accomplished. (c) Any alternate equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration. This AD supersedes AD 80-07-11 (Amdt. 39-3726, 45 FR 20778). The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Bell Helicopter Textron, Product Support Department, Post Office Box 482, Fort Worth, Texas 73101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, FAA, 4400 Blue Mound Road, Fort Worth, Texas, and at the FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at their headquarters in Washington, D.C., and at the Southwest Regional Office in Fort Worth, Texas. This amendment becomes effective January 26, 1981. FOOTER:
Document Text
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AD Final Rules - DRS_81-02-10.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-02-10 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters Subject: Clutch Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/26/1981 Make: Bell Helicopter Textron, Inc. Model: 214B | 214B-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: 81-02-10 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4025 AD NUMBER: 81-02-10 SUBJECT HEADING: Airworthiness Directives; BELL Models 214B and 214B-1 Helicopters ACTION: SUMMARY: DATES: Effective January 26, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-02-10 BELL: Amendment 39-4025. Applies to Models 214B and 214B-1 helicopters, serial numbers up to and including S/N 28049. Compliance is required as indicated unless already accomplished. To prevent a clutch failure which will result in the loss of engine power to the main rotor, accomplish the following: (a) The freewheeling clutch assembly, P/N 214-040-021-001, must be removed from service and P/N 214-040-021-103 clutch assembly installed according to the following schedule; (1) P/N 214-040-021-001 clutch assemblies with 290 or more hours' time in service on the effective date of this AD must be removed from service within the next 10 hours' time in service. (2) P/N 214-040-021-001 clutch assemblies with less than 290 hours' time in service on the effective date of this AD must be removed from service prior to attaining 300 hours' time in service. (3) P/N 214-040-021-001 clutch assemblies with unknown time in service must be removed within the next ten hours' time in service. NOTE: BHT Alert Service Bulletin No. 214-80-13, dated August 22, 1980, pertains to this subject. (b) Special flight permits may be issued in accordance with FAR 21.197 and FAR 21.199 to fly aircraft to a base where this AD can be accomplished. (c) Any alternate equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration. This AD supersedes AD 80-07-11 (Amdt. 39-3726, 45 FR 20778). The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Bell Helicopter Textron, Product Support Department, Post Office Box 482, Fort Worth, Texas 73101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, FAA, 4400 Blue Mound Road, Fort Worth, Texas, and at the FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at their headquarters in Washington, D.C., and at the Southwest Regional Office in Fort Worth, Texas. This amendment becomes effective January 26, 1981. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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