AD/DHC-8/11 Amdt 2 Engine Cowl Door Retention and Pressure Relief (Cth)

AIRWORTHINESS DIRECTIVE

On the commencement date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below repeals Airworthiness Directive (AD) AD/DHC-8/11 Amdt 1 and issues the following AD under subregulation 39.001 (1) of CASR 1998 and subsection 33 (3) of the Acts Interpretation Act 1901. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct an 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 DHC-8 Series Aeroplanes

AD/DHC-8/11 Amdt 2 Engine Cowl Door Retention
and Pressure Relief 21/2017

Applicability:

Bombardier DHC-8 Model 100 series, serial numbers 3 through 193.

Requirement:

Modify both engine cowlings in accordance with Bombardier Service Bulletin (SB) 8-71-13, as in force from time to time.

Note 1:  Canadian AD CF-89-15R1 refers.

Note 2:  The words “as in force from time to time” require compliance with the most recent version of the SB.

Compliance:

Within 30 days after the commencement date of this AD, unless previously accomplished.

Note 3:  Previous compliance with the requirement in AD/DHC-8/11 Amdt 1 constitutes compliance with the requirement in this AD.

This AD commences on 3 November 2017.

Background:

There have been instances of loss of engine cowl doors during engine fires. That door loss has rendered the fire extinguishing system ineffective.

Amendment 1 of this AD was issued to reflect Revision C of the Requirement Document (Bombardier SB 8-71-13).

Amendment 2 is issued to align the AD applicability with that of the Canadian AD and to reference the latest revision of the Canadian AD.

Ben Wilson
Delegate of the Civil Aviation Safety Authority

18 October 2017