AD 87-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters |
Unsafe Condition
Failure of the collective hub locking plate due to the use of P/N 214-010-232-101 lower locking plate and P/N 214-010-231-101 upper locking plate.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the lower and upper locking plates with P/N 214-010-569-101 within 50 hours' time in service or 30 days after the effective date, whichever comes first. Subsequent inspections for slippage every 25 hours' time in service and cracks every 500 hours' time in service, with replacement if cracks are found. Retorque the lower hub nut and install the new locking plate as required.
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 or within 30 days after the effective date of this AD, whichever comes first
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214ST (S/N 28101-28159), 214B, and 214B-1 (S/N 28001-28070) helicopters equipped with P/N 214-010-231-101 upper and 214-010-232-101 lower locking plates.
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Federal Register Abstract
Locking Plates
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_87-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 87-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters Subject: Locking Plates Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/26/1987 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Helicopter Textron, Inc. Model: 214B | 214B-1 | 214ST Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 87-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5607 AD NUMBER: 87-11-06 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters ACTION: SUMMARY: DATES: Effective May 26, 1987. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 87-11-06 BELL HELICOPTER TEXTRON, INC.: Amendment 39-5607. Applies to Bell Helicopter Textron, Inc., Model 214ST helicopters, S/N's 28101 through 28159, and Models 214B and 214B-1, S/N's 28001 through 28070, certificated in any category, equipped with upper and lower locking plates, P/N's 214-010-231-101 and 214-010-232-101. Compliance is required as indicated, unless already accomplished. (a) To prevent failure of the collective hub locking plate, on the Model 214ST, 214B, and 214B-1 helicopters, replace the P/N 214-010-232-101 lower locking plate and the P/N 214-010-231-101 upper locking plate with locking plate P/N 214-010-569-101 in accordance with Part I of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 214ST-86-37, Rev. A, dated November 3, 1986, within the next 50 hours' time in service or within 30 days after the effective date of this AD, whichever comes first. (b) Within the next 25 hours' time in service after completing the requirements of paragraph (a) and thereafter at intervals not to exceed 25 hours' time in service from the last inspection, visually inspect the hub and lower hub nut assembly for slippage in accordance with Part II of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 2145T-86-37, Rev. A, dated November 3, 1986. (c) Within the next 500 hours' time in service after completing the requirements of paragraph (a) and thereafter at intervals not to exceed 500 hours' time in service from the last inspection, perform the following in accordance with Part III of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 214ST-86-37, Rev. A, dated November 3, 1986: (1) Inspect the hub locking plate, P/N 214-010-569-101, for cracks. (2) If a crack is found during this inspection, replace the hub locking plate with a serviceable part. (3) Retorque the lower hub nut and install locking plate, P/N 21 4-010-569- 101, as detailed in paragraph (a). (d) Installation instructions for the scissors and sleeve may be found in the BHTI- 214ST Maintenance Manual, Chapter 62-21-00, and 214B Maintenance Manual, Chapter 65-20- 00. (e) Upon compliance with this airworthiness directive, the inspections and actions required by priority letter Airworthiness Directive No. 86-12-01, issued June 6, 1986, may be discontinued. (f) An alternate method of compliance which provides an equivalent level of safety with this AD may be used when approved by the Manager, Helicopter Certification Branch, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas 76106. The procedure shall be done in accordance with BHT1 ASB 214-86-36, dated October 8, 1986,or ASB 214ST-86-37, Rev. A., dated November 3, 1986. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a)(1). Copies may be obtained upon request to Bell Helicopter Textron, Inc., P.O. Box 482, Fort Worth, Texas 76101, Attention: Customer Support. Copies may be inspected at the Office of Regional Counsel, FAA, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas, or at the Office of the Federal Register, 1100 L Street, NW., Room 8401, Washington, D.C. This amendment becomes effective May 26, 1987. FOOTER:
Document Text
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AD Final Rules - DRS_87-11-06.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 87-11-06 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters Subject: Locking Plates Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/26/1987 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: 87-11-06 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5607 AD NUMBER: 87-11-06 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 214ST, 214B and 214B-1 Helicopters ACTION: SUMMARY: DATES: Effective May 26, 1987. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 87-11-06 BELL HELICOPTER TEXTRON, INC.: Amendment 39-5607. Applies to Bell Helicopter Textron, Inc., Model 214ST helicopters, S/N's 28101 through 28159, and Models 214B and 214B-1, S/N's 28001 through 28070, certificated in any category, equipped with upper and lower locking plates, P/N's 214-010-231-101 and 214-010-232-101. Compliance is required as indicated, unless already accomplished. (a) To prevent failure of the collective hub locking plate, on the Model 214ST, 214B, and 214B-1 helicopters, replace the P/N 214-010-232-101 lower locking plate and the P/N 214-010-231-101 upper locking plate with locking plate P/N 214-010-569-101 in accordance with Part I of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 214ST-86-37, Rev. A, dated November 3, 1986, within the next 50 hours' time in service or within 30 days after the effective date of this AD, whichever comes first. (b) Within the next 25 hours' time in service after completing the requirements of paragraph (a) and thereafter at intervals not to exceed 25 hours' time in service from the last inspection, visually inspect the hub and lower hub nut assembly for slippage in accordance with Part II of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 2145T-86-37, Rev. A, dated November 3, 1986. (c) Within the next 500 hours' time in service after completing the requirements of paragraph (a) and thereafter at intervals not to exceed 500 hours' time in service from the last inspection, perform the following in accordance with Part III of BHTI ASB 214-86-36, dated October 8, 1986, or ASB 214ST-86-37, Rev. A, dated November 3, 1986: (1) Inspect the hub locking plate, P/N 214-010-569-101, for cracks. (2) If a crack is found during this inspection, replace the hub locking plate with a serviceable part. (3) Retorque the lower hub nut and install locking plate, P/N 21 4-010-569- 101, as detailed in paragraph (a). (d) Installation instructions for the scissors and sleeve may be found in the BHTI- 214ST Maintenance Manual, Chapter 62-21-00, and 214B Maintenance Manual, Chapter 65-20- 00. (e) Upon compliance with this airworthiness directive, the inspections and actions required by priority letter Airworthiness Directive No. 86-12-01, issued June 6, 1986, may be discontinued. (f) An alternate method of compliance which provides an equivalent level of safety with this AD may be used when approved by the Manager, Helicopter Certification Branch, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas 76106. The procedure shall be done in accordance with BHT1 ASB 214-86-36, dated October 8, 1986,or ASB 214ST-86-37, Rev. A., dated November 3, 1986. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a)(1). Copies may be obtained upon request to Bell Helicopter Textron, Inc., P.O. Box 482, Fort Worth, Texas 76101, Attention: Customer Support. Copies may be inspected at the Office of Regional Counsel, FAA, Southwest Region, 4400 Blue Mound Road, Fort Worth, Texas, or at the Office of the Federal Register, 1100 L Street, NW., Room 8401, Washington, D.C. This amendment becomes effective May 26, 1987. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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