AIRWORTHINESS DIRECTIVE On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/B767/187 and issues the following 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. Boeing 767 Series Aeroplanes AD/B767/187 Amdt 1 Aft Pressure Bulkhead Insulation Blankets 13/2007 Applicability: Model 767-200 and -300 series aircraft, as listed in Boeing Service Bulletin 767-25A0300 Revision 1, dated 2 May 2002, or later approved issue. Requirement: Modify the installation of the aft pressure bulkhead-to-floor insulation blankets in accordance with the Accomplishment Instructions of Boeing Service Bulletin 767-25A0300 Revision 1 or later approved issue. Note: FAA AD 2003-13-03 Amdt 39-13203 refers. Compliance: Before 31 July 2010. Compliance with the original issue of the Airworthiness Directive constitutes compliance with this amendment. This Amendment becomes effective on 20 December 2007. Background: The actions specified by this Directive are intended to prevent interference with venting during a rapid decompression in the bulk cargo compartment. Such interference could cause damage to the floor structure and damage to certain empennage control cables, which could result in reduced controllability of the aircraft. This amendment allows the use of revision 3 of the Boeing Service Bulletin, which incorporates an FAA AMOC for substitution of materials compliant with flame propagation regulations. The original issue of this airworthiness directive became effective on 2 October 2003. David Villiers Delegate of the Civil Aviation Safety Authority 7 November 2007