Overview

The Civil Aviation Safety Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, are integral to ensuring the safety of civil aviation within the country. This legislation provides the legal framework for the Civil Aviation Safety Authority (CASA) to issue safety directives, which are crucial in maintaining and improving the safety standards of aircraft and aeronautical products. Specifically, Part 39 - 105 of these regulations allows CASA to issue Airworthiness Directives (ADs) to address identified safety issues. For instance, Airworthiness Directive AD/B737/223 Amdt 1, issued under the authority of subregulation 39.1 (1) of the CASR 1998, mandates specific actions to correct unsafe conditions in Boeing 737 series aircraft. This directive was introduced to prevent potential hazards such as the disconnection of latch cables from escape slide latch blocks, which could compromise emergency evacuation procedures. The policy objective is to ensure the continued airworthiness of aircraft by enforcing necessary maintenance and modification actions to mitigate safety risks.

Scope and Application

The Civil Aviation Safety Regulations 1998, specifically Part 39 - 105 Civil Aviation Safety Authority Schedule of Airworthiness Directives, establishes mandatory requirements for maintaining the airworthiness of certain aircraft, in this case, the Boeing 737 Series Aeroplanes. This Airworthiness Directive applies to the Model 737-100, -200, -200C, -300, -400, and –500 series aircraft, as referenced in Boeing Special Attention Service Bulletin (SB) 737-25-1434 dated 22 March 2001. The directive mandates the replacement of existing screw, nut, and washers that attach the latch cable assembly to the latch block assembly of the door mounted escape slides with new, improved parts. This action is required to prevent the latch cable assembly from disconnecting from the latch block assembly, which could result in an escape slide not deploying in an emergency situation. The directive specifies the use of new self-locking nuts, part number BACN10R10L, as referenced in FAA AMOC 150S-03-125. The compliance period for implementing these changes is within 36 months from 13 May 2004. This Airworthiness Directive is issued under the authority of a delegate of the Civil Aviation Safety Authority and is notified in the Commonwealth of Australia Gazette on 5 May 2004.

Key Provisions

The Civil Aviation Safety Regulations 1998, under Part 39-105, contain the Airworthiness Directive (AD) AD/B737/223 Amendment 1, which pertains to the Boeing 737 series aeroplanes. This specific AD, issued by the delegate of the Civil Aviation Safety Authority (CASA), focuses on the door mounted escape slide latch block assembly (section 1). The AD requires the replacement of certain components of the escape slide latch to ensure safety and prevent malfunction during an emergency evacuation. The AD applies to all Boeing 737-100, -200, -200C, -300, -400, and –500 series aircraft, as detailed in Boeing Special Attention Service Bulletin (SB) 737-25-1434, dated 22 March 2001 (section 2). The requirement is to replace the existing screw, nut, and washers that attach the latch cable assembly to the latch block assembly of the door mounted escape slides with new, improved parts, in accordance with SB 737-25-1434 (section 3). Additionally, when performing this replacement, new (unused) self locking nuts, part number BACN10R10L, must be installed, as per FAA AMOC 150S-03-125 (section 3, note). The AD mandates that the specified actions be carried out within 36 months from 13 May 2004 (section 4). This directive was issued to prevent the latch cable assembly from disconnecting from the latch block assembly of the door mounted escape slide, which could result in the escape slide not deploying in an emergency situation (section 5). The AD references FAA AD 2004-03-34 Amendment 39-13478, which provides further context regarding the safety measures being implemented (section 5, note). Failure to comply with the provisions of this AD may result in legal consequences. The AD is a regulatory requirement, and non-compliance could potentially lead to civil or criminal penalties as stipulated by the Civil Aviation Act 1988 or other relevant legislation. However, the specific penalties are not detailed within the AD itself but would be determined by the regulatory body and the courts in the event of non-compliance.