Commonwealth legislation

AD/DHC-8/97 - Control Column Torque Tube

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

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This Airworthiness Directive requires installation of control‑column torque‑tube catchers (ModSum 8Q101338) per Bombardier Service Bulletin 8‑27‑90 on specified DHC‑8 models/serial numbers within 5,000 flight hours of 8 July 2004 to address a possible single‑shear torque‑tube failure that could reduce controllability. Aircraft operators must arrange and pay for the modification; the CASA delegate enforces compliance under CASR subreg 39.1(1), and non‑compliance can attract regulatory action.

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AIRWORTHINESS DIRECTIVE

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For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (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.

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Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/97 Control Column Torque Tube 7

AD/DHC-8/97 Control Column Torque Tube 7/2004

Applicability: DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314, and 315 aircraft, serial

numbers 003 through 584.

Requirement: Install control column torque tube catchers by incorporating ModSum 8Q101338; in accordance with instructions provided in Bombardier Service Bulletin 8-27-90, dated 28 October 2003.

Note: Transport Canada AD CF-2004-08 refers.

Compliance: Within 5,000 flight hours after 8 July 2004, unless already accomplished.

This Airworthiness Directive becomes effective on 8 July 2004.

Background: The manufacturer has identified that a single shear failure in the control column torque tube, inboard of its self-aligning bearings, could result in each of the pilot’s and co-pilot’s control column being supported by only one self-aligning bearing. This condition could result in reduced controllability of the aircraft.

View image in the official source

David Villiers

Delegate of the Civil Aviation Safety Authority 26 May 2004

View image in the official source

The above AD is notified in the Commonwealth of Australia Gazette on 16 June 2004.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

AIRWORTHINESS DIRECTIVE AIRWORTHINESS DIRECTIVE

AIRWORTHINESS DIRECTIVE

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/97 Control Column Torque Tube 7 AD/DHC-8/97 Control Column Torque Tube 7/2004

AD/DHC-8/97 Control Column Torque Tube 7/2004

Applicability: DHC-8 Models 102, 103, 106, 201, 202, 301, 311, 314, and 315 aircraft, serial

numbers 003 through 584.

Requirement: Install control column torque tube catchers by incorporating ModSum 8Q101338; in accordance with instructions provided in Bombardier Service Bulletin 8-27-90, dated 28 October 2003.

Note: Transport Canada AD CF-2004-08 refers.

Compliance: Within 5,000 flight hours after 8 July 2004, unless already accomplished.

This Airworthiness Directive becomes effective on 8 July 2004.

David Villiers

Delegate of the Civil Aviation Safety Authority 26 May 2004

The above AD is notified in the Commonwealth of Australia Gazette on 16 June 2004.