AD 92-06-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters |
Unsafe Condition
Premature wear of the main transmission sungear, part number 206-040-662-101, and mating spur gears due to insufficient tip relief or improper tooth profile, which could result in transmission failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace listed main transmission sungears with serial numbers SD-0005 through SD-0071 (as listed in the AD) by the next inspection interval or within 1,500 hours' time in service after April 13, 1992. Inspect mating spur gears for micro pitting or hardlines in the gear teeth; replace those exceeding specified limits before further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
At the next inspection interval for the main transmission sungear, but no later than 1,500 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, Inc. Model 206A, 206B, 206L, 206L-1, and 206L-3 helicopters with main transmission sungear part number 206-040-662-101 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Transmission Failure
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_92-06-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 92-06-12 Document Type: AD Final Rules Docket Number: 90-ASW-48 Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters Subject: Transmission Failure Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/13/1992 Make: Bell Helicopter Textron Canada Limited Model: 206A | 206B | 206L | 206L-1 | 206L-3 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: 92-06-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-ASW-48 AMENDMENT: 39-8192 AD NUMBER: 92-06-12 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters ACTION: SUMMARY: DATES: Effective April 13, 1992. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 92-06-12 BELL HELICOPTER TEXTRON, INC.: Amendment 39-8192. Docket No. 90-ASW-48. Applicability: All Model 206A, 206B, 206L, 206L-1, and 206L-3 helicopters, certificated in any category, with the main transmission sungear, part number (P/N) 206-040-662-101, installed. Compliance: Required as indicated, unless already accomplished. To prevent premature wear of the sungear and mating spur gears which could result in transmission failure, accomplish the following: (a) At the next inspection interval for the main transmission sungear, P/N 206-040-662-101, but no later than 1,500 hours' time in service after the effective date of this AD, remove and replace sungears which have the following serial numbers: SD-0005 SD-0010 SD-0020 SD-0022 SD-0023 SD-0024 SD-0025 SD-0026 SD-0027 SD-0031 SD-0033 SD-0034 SD-0035 SD-0036 SD-0037 SD-0039 SD-0040 SD-0043 SD-0044 SD-0046 SD-0054 SD-0055 SD-0057 SD-0060 SD-0062 SD-0065 SD-0066 SD-0067 SD-0068 SD-0069 SD-0071 (b) In conjunction with (a), inspect the pinion spur gears which mate with the above listed sungears for micro pitting or hardlines in the gear teeth due to the insufficient tip relief, or improper tooth profile of the sungear. Determine if wear or damage is within specified limits according to the applicable BHTI maintenance, repair and overhaul manuals. (c) If wear or damage exceeds the specified limits, remove and replace the affected spur gears with serviceable parts before further flight. (d) An alternative method of compliance or adjustment of the compliance times which provides an acceptable level of safety may be used if approved by the Manager, Rotorcraft Certification Office, ASW-170, Rotorcraft Directorate, Aircraft Certification Service, FAA, Fort Worth, Texas, 76193-0170. (e) Bell Helicopter Textron, Inc., Alert Service Bulletins No. 206-90-56, Rev. A, dated 1/15/91 or 206L-90-69, Rev. A, dated 1/15/91, as applicable, provide an acceptable, alternate means of compliance with this AD. (f) This amendment becomes effective on April 13, 1992. FOOTER:
Document Text
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AD Final Rules - DRS_92-06-12.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 92-06-12 Document Type: AD Final Rules Docket Number: 90-ASW-48 Subject Heading: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters Subject: Transmission Failure Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 04/13/1992 Make: Bell Helicopter Textron Canada Limited Model: 206A | 206B | 206L | 206L-1 | 206L-3 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: 92-06-12 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 90-ASW-48 AMENDMENT: 39-8192 AD NUMBER: 92-06-12 SUBJECT HEADING: Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 206A, 206B, 206L, 206L-1, and 206L-3 Helicopters ACTION: SUMMARY: DATES: Effective April 13, 1992. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 92-06-12 BELL HELICOPTER TEXTRON, INC.: Amendment 39-8192. Docket No. 90-ASW-48. Applicability: All Model 206A, 206B, 206L, 206L-1, and 206L-3 helicopters, certificated in any category, with the main transmission sungear, part number (P/N) 206-040-662-101, installed. Compliance: Required as indicated, unless already accomplished. To prevent premature wear of the sungear and mating spur gears which could result in transmission failure, accomplish the following: (a) At the next inspection interval for the main transmission sungear, P/N 206-040-662-101, but no later than 1,500 hours' time in service after the effective date of this AD, remove and replace sungears which have the following serial numbers: SD-0005 SD-0010 SD-0020 SD-0022 SD-0023 SD-0024 SD-0025 SD-0026 SD-0027 SD-0031 SD-0033 SD-0034 SD-0035 SD-0036 SD-0037 SD-0039 SD-0040 SD-0043 SD-0044 SD-0046 SD-0054 SD-0055 SD-0057 SD-0060 SD-0062 SD-0065 SD-0066 SD-0067 SD-0068 SD-0069 SD-0071 (b) In conjunction with (a), inspect the pinion spur gears which mate with the above listed sungears for micro pitting or hardlines in the gear teeth due to the insufficient tip relief, or improper tooth profile of the sungear. Determine if wear or damage is within specified limits according to the applicable BHTI maintenance, repair and overhaul manuals. (c) If wear or damage exceeds the specified limits, remove and replace the affected spur gears with serviceable parts before further flight. (d) An alternative method of compliance or adjustment of the compliance times which provides an acceptable level of safety may be used if approved by the Manager, Rotorcraft Certification Office, ASW-170, Rotorcraft Directorate, Aircraft Certification Service, FAA, Fort Worth, Texas, 76193-0170. (e) Bell Helicopter Textron, Inc., Alert Service Bulletins No. 206-90-56, Rev. A, dated 1/15/91 or 206L-90-69, Rev. A, dated 1/15/91, as applicable, provide an acceptable, alternate means of compliance with this AD. (f) This amendment becomes effective on April 13, 1992. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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