AD 81-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters |
Unsafe Condition
Failure of main rotor spindle attachment pin retention bolts, P/N EWB26-10H90, due to corrosion or exceeding 1,200 hours' time in service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect each of the four main rotor spindle attachment pin retention bolts for corrosion; replace bolts exceeding 1,200 hours' time in service or showing corrosion. Install replacement bolts with corrosion prevention compound and proper torque.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 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
Bell Helicopter Textron Model 214B, 214B-1, 214ST helicopters certified in all categories
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Spindle Retention Bolts
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_81-12-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-12-03 Document Type: AD Final Rules Docket Number: 81-ASW-24 Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters Subject: Spindle Retention Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/11/1981 Make: Bell Helicopter Textron, Inc. Model: 214B | 214B-1 | 214ST Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 81-12-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 81-ASW-24 AMENDMENT: 39-4125 AD NUMBER: 81-12-03 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters ACTION: SUMMARY: DATES: Effective June 11, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-12-03 BELL HELICOPTER TEXTRON (BHT): Amendment 39-4125. Applies to all Model 214 series helicopters certified in all categories (Airworthiness Docket No. 81-ASW- 24). To prevent possible failure of main rotor spindle attachment pin retention bolts, P/N EWB26-10H90, accomplish the following: (a) Unless Bell Helicopter Textron Alert Service Bulletin 214-81-17 has been previously complied with, within the next 50 hours' time in service after the effective date of this AD: (1) Remove and inspect each of the four main rotor spindle attachment pin retention bolts, P/N EWB26-10H90, for evidence of corrosion. (2) Replace all bolts exceeding 1,200 hours' time in service or showing evidence of corrosion. (3) When installing the bolts, assure that each bolt is installed using corrosion prevention compound MIL-C-16173 grade 1 or 2 or equivalent on the shank of the bolt. Wipe threads clean prior to installing the nuts. Torque the nut to 150 foot-pounds. (b) Bolts, P/N EWB26-10H90, now have a 1,200 hour retirement. Record the 1,200 hour retirement life in the aircraft records. (c) Any 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. (d) In accordance with FAR 21.197, flight is permitted to a base where the inspection and repairs required by this AD may be accomplished. This amendment becomes effective June 11, 1981. FOOTER:
Document Text
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AD Final Rules - DRS_81-12-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-12-03 Document Type: AD Final Rules Docket Number: 81-ASW-24 Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters Subject: Spindle Retention Bolts Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/11/1981 Make: Bell Helicopter Textron, Inc. Model: 214B | 214B-1 | 214ST 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: 81-12-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 81-ASW-24 AMENDMENT: 39-4125 AD NUMBER: 81-12-03 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON (BHT) Model 214 Series Helicopters ACTION: SUMMARY: DATES: Effective June 11, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-12-03 BELL HELICOPTER TEXTRON (BHT): Amendment 39-4125. Applies to all Model 214 series helicopters certified in all categories (Airworthiness Docket No. 81-ASW- 24). To prevent possible failure of main rotor spindle attachment pin retention bolts, P/N EWB26-10H90, accomplish the following: (a) Unless Bell Helicopter Textron Alert Service Bulletin 214-81-17 has been previously complied with, within the next 50 hours' time in service after the effective date of this AD: (1) Remove and inspect each of the four main rotor spindle attachment pin retention bolts, P/N EWB26-10H90, for evidence of corrosion. (2) Replace all bolts exceeding 1,200 hours' time in service or showing evidence of corrosion. (3) When installing the bolts, assure that each bolt is installed using corrosion prevention compound MIL-C-16173 grade 1 or 2 or equivalent on the shank of the bolt. Wipe threads clean prior to installing the nuts. Torque the nut to 150 foot-pounds. (b) Bolts, P/N EWB26-10H90, now have a 1,200 hour retirement. Record the 1,200 hour retirement life in the aircraft records. (c) Any 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. (d) In accordance with FAR 21.197, flight is permitted to a base where the inspection and repairs required by this AD may be accomplished. This amendment becomes effective June 11, 1981. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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