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 issues the following Airworthiness Directive (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.

Boeing 737 Series Aeroplanes

AD/B737/235 Fuselage Skin Area at the Dorsal Fin Assembly 1/2005

Applicability: All Model 737-300, -400, and -500 series aircraft.

Requirement: Inspect in accordance with the technical requirements of FAA AD 2004-22-05 Amdt 39-13833.

Note: Boeing Message Number 1-QX035, dated 13 October 2004 refers; and references Part I of Boeing Service Bulletin 737-55-1057 Revision 1, dated 22 July 1999, as an additional source of service information.

Compliance: As specified in the Requirement document, with a revised effective date of 20 January 2005.

This Airworthiness Directive becomes effective on 20 January 2005.

Background: The FAA received a report of an 18-inch crack found in the fuselage skin area under the blade seals of the nose cap of the dorsal fin due to previous wear damage. Such damage could result in fatigue cracking due to cabin pressurisation, and consequent rapid in-flight decompression of the aircraft fuselage.

David Villiers

Delegate of the Civil Aviation Safety Authority 3 December 2004

The above AD is notified in the Commonwealth of Australia Gazette on 22 December 2004.

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