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AIRWORTHINESS DIRECTIVE ADDHC-8137 Wing Front Spar to Fuselage

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					COMMONWEALTH OF AUSTRALIA                                                       (Civil Aviation Safety Regulations 1998), PART 39 - 105
CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES



                                                   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-8/137                                 Wing Front Spar to Fuselage Attachment                                                                  4/2008
                                                                                                                                                     DM

Applicability:               DHC-8 aircraft, Models 400, 401, and 402, serial numbers 4001, and 4003 through
                             4176.

Requirement:                 Action in accordance with the requirements of Transport Canada Emergency AD
                             CF-2008-11.

                             Note: Bombardier Inc. Alert Service Bulletin A84-57-19 original issue, or later
                             Transport Canada approved revision, refers.

Compliance:                  As specified in the Requirement document, with a revised effective date of 8 February
                             2008.

                             This Airworthiness Directive becomes effective on 8 February 2008.

Background:                  During scheduled maintenance, an operator found cracks in the DSC228-16 barrel nut
                             at one of the four primary front spar wing to fuselage attachment joints. The
                             investigation determined that the cracks were due to hydrogen embrittlement and the
                             problem is believed to be restricted to a batch of 166 barrel nuts from one supplier.
                             Further inspection by a different operator revealed that cracked barrel nuts were found
                             at three of the four wing front spar to fuselage joints on the same aircraft. All three
                             barrel nuts were from the suspect batch. Failure of the barrel nuts could compromise
                             the integrity of the wing to fuselage attachments.




David Villiers
Delegate of the Civil Aviation Safety Authority

6 February 2008




                                                                                                                                                     Page 1 of 1
                                                     Federal Register of Legislative Instruments F2008L00311

				
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Description: AIRWORTHINESS DIRECTIVE ADDHC-8137 Wing Front Spar to Fuselage