Document ID: chunk:federal_register_of_legislation:F2007L03909:body:0
Version: federal_register_of_legislation:F2007L03909
Segment Type: other
Provision Reference: 
Character Range: 0–3223

AIRWORTHINESS DIRECTIVE
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters
AD/BELL 206/173  Disc Assemblies - Tail Rotor Driveshaft  12/2007 DM

Applicability:  Bell Helicopter Textron Canada (BHTC) Model 206 series helicopters S/N up to 4618 and Model 206L series helicopters S/N up to 52340 fitted with disc assemblies P/N 32721-1.
Requirement:       1. Verify disc assemblies P/N 32721-1 for manufacturing date, proper thickness and indexing, in accordance with the instructions provided in the applicable Alert Service Bulletins (ASB) listed below or later approved revisions.

                     206 series: ASB-206-07-114 dated 28 March 2007

                     206L series: ASB-206L-07-145 dated 28 March 2007

                   If disc assemblies, after verification in accordance with Requirement 1, do not require any further action, or if the manufacturing date is not between 1 November 2005 and 30 November 2006, make an appropriate log book entry to this effect. No further action is required.

                   2. Remove any disc assembly which is not within the required thickness of 0.115 - 0.127 inch (2.921 - 3.225 mm).

                   3. Remove any disc assembly which is not properly indexed.

                   4. Do not install any disc assembly P/N 32721-1 into any helicopter unless it is compliant to the applicable Alert Service Bulletins (ASB) listed below or later approved revisions.

                     206 series: ASB-206-07-114 dated 28 March 2007.

                     206L series: ASB-206L-07-145 dated 28 March 2007.

                Note:  Transport Canada Airworthiness Directive CF-2007-16 dated 24 August 2007 refers.

Compliance:     1. Unless already accomplished, no later than 25 flight hours or 30 days from the effective date of this directive, whichever comes first.

                2. Within 10 flight hours, after the completion of requirement 1.

                3. Within 300 flight hours or at next scheduled inspection, whichever comes first, after the completion of requirement 1.

                4. After the effective date of this Airworthiness Directive.
             This Airworthiness Directive becomes effective on 3 October 2007.
Background:  Transport Canada has determined that disc assemblies part number (P/N) 32721-1 manufactured between 1 November 2005 and 30 November 2006, may have discs of improper thickness or discs may have been indexed incorrectly.

David Villiers
Delegate of the Civil Aviation Safety Authority

28 September 2007