# AD 81-06-05 R1: Fuel/Oil Line Damage

- Type: Airworthiness directive
- Status: Current
- Products: Bell Helicopter Textron Canada 206L-1
- Effective: June 1, 1981
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Rotorcraft
- Amendment: 39-4118
- Registered aircraft: 149 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/05DC1C63EA20559C86256A4E005760DC.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/81-06-05-R1

## The airworthiness directive

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.

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS H2SW](https://openairdocs.org/tcds/H2SW): Bell Textron Canada Limited; names 1 of 12 models: 206L-1

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 149 (149 by airframe model, 0 by engine model)
- Makers: Bell Helicopter Textron 149

Models with the most aircraft:

- [Bell Helicopter Textron 206L-1](https://openairdocs.org/model/bell-helicopter-textron-206l-1): 149 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/81-06-05-R1/models.md
Every aircraft: https://openairdocs.org/ad/81-06-05-R1/aircraft.md

Its text cites no advisory circulars or STCs.

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