AD/B737/295 - Airstair Doorstop Intercostal (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.

Boeing 737 Series Aeroplanes AD/B737/295 Airstair Doorstop Intercostal 10/2006

Applicability: Model 737-700 and 737-800 series aircraft; as identified in Boeing Special Attention Service Bulletin 737-53-1236 Revision 1, dated 10 November 2005, or later FAA approved revision. Requirement: Action in accordance with the technical requirements of FAA AD 2006-16-11 Amdt 39-14711. Compliance: As specified in the Requirement document, with a revised effective date of 28 September 2006. This Airworthiness Directive becomes effective on 28 September 2006. Background: The FAA received a report of fatigue cracks of the backup intercostals located above the cutout for the forward airstair door. Such cracking, unless detected and corrected, could result in more extensive fatigue cracking and lead to possible loss of cabin pressure.

David Villiers Delegate of the Civil Aviation Safety Authority

17 August 2006