AD 81-06-05 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; BELL Model 206L-1 Helicopters |
Unsafe Condition
Fires due to fuel/oil lines severed by a disintegrating turbine wheel.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Relocate the fuel filter to the specified location on the forward firewall, replace the aft freewheeling oil hose except on BHT IFR Kit equipped rotorcraft, and replace bleed air tubes as applicable. For BHT IFR Kit equipped rotorcraft, replace the aft freewheeling oil hose per service bulletin 206L-81-19.
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 the AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Limited Model 206L-1 helicopters with serial numbers 45154 through 45448, and those equipped with the BHT IFR Kit.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel/Oil Line Damage
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_81-06-05_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-06-05 R1 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL Model 206L-1 Helicopters Subject: Fuel/Oil Line Damage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/01/1981 Make: Bell Helicopter Textron Canada Limited Model: 206L-1 Product Type: Aircraft Product Subtype: Rotorcraft Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 81-06-05 R1 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4118 AD NUMBER: 81-06-05 R1 SUBJECT HEADING: Airworthiness Directives; BELL Model 206L-1 Helicopters ACTION: SUMMARY: DATES: Effective June 1, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-06-05 R1 BELL: Amendment 39-4063 as amended by Amendment 39-4118. Applies to Model 206L-1 helicopters. Paragraph (a) applies to S/N 45154 through 45448. Paragraph (b) applies to helicopters equipped with the BHT IFR Kit. Compliance is required within the next 50 hours' time in service after the effective date of the AD unless already accomplished. To prevent fires due to fuel/oil lines severed by a disintegrating turbine wheel, accomplish the following: (a) Per the instructions in BHT Alert Service Bulletin No. 206L-80-13, "Modification of Engine Fuel Filter, Associated Fuel Hoses and Freewheeling Oil Hoses," dated February 17, 1980, perform the following modifications: (1) On all affected rotorcraft, relocate the fuel filter from its present position to the specified location on the forward firewall. (2) Replace the aft freewheeling oil hose on all affected rotorcraft except rotorcraft equipped with the BHT IFR Kit. (3) As applicable, replace bleed air tubes to avoid an interference at the new filter location. (b) Per the instructions in BHT Alert Service Bulletin No. 206L-81-19, "Replacement of Freewheeling Aft Oil Vent Hose Assembly, P/N 124F001ABB03 11SS," dated February 24, 1981, replace the aft freewheeling oil hose on all affected rotorcraft equipped with BHT IFR Kit. (c) Any alternate method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration. 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, P.O. Box 482, Fort Worth, Texas 76101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas, and at the FAA Headquarters, 800 Independence Avenue, SW., 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. Amendment 39-4063 became effective March 24, 1981. This amendment 39-4118 becomes effective June 1, 1981. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_81-06-05_R.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 81-06-05 R1 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: Airworthiness Directives; BELL Model 206L-1 Helicopters Subject: Fuel/Oil Line Damage Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 06/01/1981 Make: Bell Helicopter Textron Canada Limited Model: 206L-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: 81-06-05 R1 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-4118 AD NUMBER: 81-06-05 R1 SUBJECT HEADING: Airworthiness Directives; BELL Model 206L-1 Helicopters ACTION: SUMMARY: DATES: Effective June 1, 1981. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 81-06-05 R1 BELL: Amendment 39-4063 as amended by Amendment 39-4118. Applies to Model 206L-1 helicopters. Paragraph (a) applies to S/N 45154 through 45448. Paragraph (b) applies to helicopters equipped with the BHT IFR Kit. Compliance is required within the next 50 hours' time in service after the effective date of the AD unless already accomplished. To prevent fires due to fuel/oil lines severed by a disintegrating turbine wheel, accomplish the following: (a) Per the instructions in BHT Alert Service Bulletin No. 206L-80-13, "Modification of Engine Fuel Filter, Associated Fuel Hoses and Freewheeling Oil Hoses," dated February 17, 1980, perform the following modifications: (1) On all affected rotorcraft, relocate the fuel filter from its present position to the specified location on the forward firewall. (2) Replace the aft freewheeling oil hose on all affected rotorcraft except rotorcraft equipped with the BHT IFR Kit. (3) As applicable, replace bleed air tubes to avoid an interference at the new filter location. (b) Per the instructions in BHT Alert Service Bulletin No. 206L-81-19, "Replacement of Freewheeling Aft Oil Vent Hose Assembly, P/N 124F001ABB03 11SS," dated February 24, 1981, replace the aft freewheeling oil hose on all affected rotorcraft equipped with BHT IFR Kit. (c) Any alternate method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration. 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, P.O. Box 482, Fort Worth, Texas 76101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas, and at the FAA Headquarters, 800 Independence Avenue, SW., 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. Amendment 39-4063 became effective March 24, 1981. This amendment 39-4118 becomes effective June 1, 1981. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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