Document ID: chunk:federal_register_of_legislation:F2006B04787:body:0
Version: federal_register_of_legislation:F2006B04787
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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 revokes Airworthiness Directive (AD) AD/BN-2/74 and issues the following 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.

 Pilatus Britten-Norman BN-2 Series Aeroplanes

 AD/BN-2/74
 Amdt 1

 Engine Mounting Brackets 8/2003

 Applicability: All Model BN2A, BN2B, BN2T, BN2T-4R, and BN2T-4S Islander aircraft. Requirement:              Inspect in accordance with B-N Group Ltd. Mandatory Service Bulletin (SB) No. 275
           Issue 3.

           Note: UK CAA AD 005-11-2001 refers.

           Compliance: At the next 500-hour inspection or SB 190 inspection after 21 March 2002, whichever occurs first. Repeat inspections/replace bracket(s) in accordance with criteria specified in the Compliance Statement of the Requirement document.

           The initial compliance time remains unchanged by this issue. This Amendment becomes effective on 7 August 2003.
 Background: There have been reports of extensive cracking of the engine mount brackets.
           Manufacturer service bulletins SB 61 and SB 91 cover wear, cracking and corrosion of the engine mounting brackets, but not with cracks at the points described in the Requirement document.

           Amendment 1 is issued in response to the latest Requirement document, which changes crack tolerance/repeat inspection criteria.

 David Villiers
 Delegate of the Civil Aviation Safety Authority 18 June 2003

 The above AD is notified in the Commonwealth of Australia Gazette on 16 July 2003.

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