AD/B737/98 - Krueger Flap Actuator Support Fitting

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, were enacted by the Commonwealth of Australia to ensure the safety and airworthiness of civil aircraft within Australian airspace. This legislative instrument addresses the problem of structural integrity in Boeing 737 series aeroplanes, particularly the Krueger flap actuator support fittings. The Federal Parliament authorised the regulation to mitigate risks associated with fatigue and stress corrosion, aligning with the overarching policy objective of maintaining high safety standards in civil aviation. This legislative action responds to reports received by the Federal Aviation Administration (FAA) regarding the potential for cracking in these support fittings, necessitating specific maintenance and modification actions to ensure continued airworthiness and compliance with international safety standards. The Civil Aviation Regulations 1998 were introduced to address gaps in the safety protocols governing civil aircraft operations in Australia, particularly focusing on the maintenance and structural integrity of aeroplane components. This regulation was enacted to ensure that operators of Boeing 737 series aircraft adhere to specific technical requirements and modifications, as outlined in FAA directives and Boeing Service Bulletins. The objective is to prevent potential failures due to fatigue and stress corrosion, thereby enhancing the safety of air travel and maintaining the high standards of aviation safety expected in Australia.

Scope and Application

The Civil Aviation Regulations 1998, as outlined in Part 39 - 105, address the safety of Boeing 737 series aeroplanes through the Airworthiness Directives, specifically targeting the Krueger flap actuator support fitting as per AD/B737/98. This regulation applies to all Boeing 737-100 and -200 series aircraft, specifically in line positions ranging from 001 through 813. The directive mandates compliance with the technical requirements outlined in the FAA AD 96-17-04 Amendment 39-9712, ensuring that actions are taken in accordance with the specified requirements document. This includes replacing the support fitting with a steel fitting and modifying the actuator's aft attachment, as detailed in Boeing Service Bulletin 737-57-1129 Revision 1, and subsequent Notices of Status Change 737-57-1129NSC1, 737-57-1129NSC2, and 737-57-1129NSC3. The replacement and modification effectively terminate the need for repetitive inspections required by this directive. The regulation's scope is geographically and jurisdictional within the Commonwealth of Australia, overseen by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, includes an airworthiness directive (AD) for Boeing 737 Series aeroplanes concerning the Krueger flap actuator support fitting, identified as AD/B737/98 (1). This directive applies to the Boeing 737-100 and -200 series aircraft in line positions 001 through 813. The requirement under this directive is to adhere to the technical specifications outlined in FAA AD 96-17-04 Amendment 39-9712 (2). Compliance is to be achieved as detailed in the accompanying Requirement Document. It is important to note that replacing the support fitting with a steel fitting and modifying the actuator aft attachment as per Boeing Service Bulletin 737-57-1129 Revision 1, updated by Notices of Status Change 737-57-1129NSC1; 737-57-1129NSC2; and 737-57-1129NSC3, satisfies the directive’s requirement and terminates the need for repetitive inspections stipulated by this AD (3). Under the Civil Aviation Regulations 1998, the parties governed by this directive are required to ensure that the specified modifications and inspections are carried out to maintain the airworthiness of the affected aircraft (4). This includes verifying that the Krueger flap actuator support fitting is replaced or modified as instructed, and that all work is performed in accordance with the FAA and Boeing documentation provided. Operators and maintenance providers must document all actions taken to comply with the AD, keeping records that detail the modifications performed and inspections conducted. Failure to comply with the requirements set forth in this airworthiness directive can lead to severe consequences. The Civil Aviation Safety Authority has the authority to enforce compliance through a range of actions, including the possibility of grounding the aircraft until the required modifications are completed. In terms of penalties, while specific civil or criminal penalties are not outlined in the regulations, non-compliance can result in significant operational disruptions and financial costs associated with rectifying the issues. Moreover, there could be safety implications if the directive is not adhered to, potentially leading to aircraft being deemed unairworthy.