AD/DHC-8/123 Brake Control Cable (Cth)

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.

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

AD/DHC-8/123 Brake Control Cable 7/2006

Applicability:

Bombardier Inc. DHC-8 Aircraft Models 400, 401 and 402, serial numbers 4003, 4004, 4006, 4008 through 4064, 4072 and 4073.

Requirement:

Carry out the following in accordance with Bombardier Service Bulletin (SB)
84-53-37, Revision A, dated 17 October 2005, or later revisions approved by Transport Canada:

1.    Perform a visual inspection of the outboard brake control cable, P/N
83200551-001, for fouling/damage.

2.    If damage to any cable is found, replace the brake control cable and rework the cable cover and, if applicable, manufacture/install the offset plate assembly.

3.    If no damage to the cable assembly is found during the visual inspection, rework the cable cover and, if applicable, manufacture/install the offset plate assembly.

Note:  Transport Canada AD CF-2006-05 dated 31 March 2006 refers.

Compliance:

1.    Within 12 months after the effective date of this AD, unless previously accomplished.

2.    Before further flight.

3.    Within 24 months of the completion of the inspection detailed in Requirement 1 of this AD, unless previously accomplished.

This Airworthiness Directive becomes effective on 6 July 2006.

Background: A check of production aircraft has determined that the outboard brake control cable, P/N 83200551-001, can foul on two camloc fasteners on the pilot’s bulkhead cover assembly, P/N 85314746.  Although brake cable problems have not been reported on in-service aircraft, the possibility exists for brake cable wear to occur.  If a brake cable were to separate while under tension, aircraft control problems could occur during take-off or landing.

James Coyne
Delegate of the Civil Aviation Safety Authority

24 May 2006