AD/B737/250 Forward Entry Door Forward and Aft Side Intercostals (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/B737/250 Forward Entry Door Forward
and Aft Side Intercostals 12/2005

Applicability:	Model 737-100, -200, -200C, -300, -400, and -500 series aircraft; as identified in Boeing Special Attention Service Bulletin 737-53-1204 dated 19 June 2003, or later FAA approved revision.
Requirement:	Action in accordance with the technical requirements of FAA AD 2005-20-03 Amdt 39-14296.
Compliance:	As specified in the Requirement document, with a revised effective date of 24 November 2005.
This Airworthiness Directive becomes effective on 24 November 2005.
Background:	The FAA received reports of fatigue cracks on several Model 737-200 series aircraft. The actions required by this Directive are intended to detect and correct fatigue cracking of the intercostals on the forward and aft sides of the forward entry door, which could result in loss of the forward entry door and rapid depressurisation of the aircraft.

David Villiers
Delegate of the Civil Aviation Safety Authority

12 October 2005