AD/B737/270 Aft Pressure Bulkhead Web 2 (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/B737/270 Aft Pressure Bulkhead Web - 2 1/2006

Applicability:

All Model 737-600, -700, 700C, -800, and -900 series aircraft.

Requirement:

Action in accordance with the technical requirements of FAA AD 2005-21-06
Amdt 39-14344.

Note:  Boeing Service Bulletin 737-53A1248 original issue, or later FAA approved revision, refers.

Compliance:

As specified in the Requirement document, with a revised effective date of
19 January 2006.

This Airworthiness Directive becomes effective on 19 January 2006.

Background:

The FAA received reports of fatigue cracks in the aft pressure bulkhead web.  The actions specified by this Directive are intended to detect and correct such fatigue cracks, which could result in a rapid decompression of the aircraft.

David Villiers
Delegate of the Civil Aviation Safety Authority

28 November 2005