Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, aims to ensure the safety and airworthiness of aircraft operating within Australia. This legislation provides a comprehensive framework for the regulation of civil aviation, addressing issues related to aircraft design, maintenance, operation, and personnel qualifications. Specifically, the Civil Aviation Regulations 1998, Part 39, addresses Airworthiness Directives, which are legally enforceable rules that mandate corrective actions to address identified safety issues. The policy objective of this legislation is to enhance aviation safety by mitigating risks associated with aircraft operations and ensuring compliance with established safety standards. The Civil Aviation Safety Authority, as the delegate of the Commonwealth of Australia, issues these directives to maintain the highest standards of safety in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, under the authority of the Civil Aviation Safety Authority (CASA), establish specific airworthiness directives for maintaining the safety of aircraft. One such directive, AD/B737/143, applies to Boeing 737 series aeroplanes, specifically model numbers 737-100, -200, -300, -400, and -500, with line numbers ranging from 1 to 3002 inclusive. This directive mandates rigorous inspection and maintenance of fuel low pressure switches and boost pumps to prevent unsafe conditions that could lead to engine rollbacks or flameouts. The directive requires the inspection and testing of main tank fuel boost pumps, with specific focus on those manufactured by General Electric Company, and the replacement of any non-compliant pumps. Additionally, all low pressure switches must be replaced with higher threshold switches to ensure proper fuel pressure indication. The directive must be complied with within specific timelines: inspections and replacements must occur within 3,000 flight hours or within one year from the aircraft’s manufacture date, or within 90 days from the directive’s effective date, whichever is earliest. Subsequent retests are required at intervals not exceeding six months. The directive also stipulates that no aircraft should be dispatched with an inoperative main fuel boost pump unless all initial tests and corrective actions are completed. This directive, effective from 13 July 2000, is binding throughout the Commonwealth of Australia and ensures adherence to safety standards mandated by CASA.

Key Provisions

The Airworthiness Directive (AD) issued under subregulation 39.1 (1) of the Civil Aviation Regulations 1998 (CAR 1998) applies specifically to Boeing 737 Series Aeroplanes, namely the 737-100, -200, -300, -400, and -500 models, with line numbers ranging from 1 through 3002 inclusive. This AD is necessitated by issues identified with the main tank fuel boost pumps and low pressure switches, which have led to engine rollbacks or flameouts due to insufficient fuel pressure. The directive mandates specific actions to rectify these issues, ensuring the safe operation of the aircraft. The AD specifies three main requirements. Firstly, it requires the inspection of the main tank fuel boost pumps to identify those manufactured by General Electric Company (GEC) of the United Kingdom. For these identified pumps, a test must be conducted as per Boeing Alert Service Bulletin 737-28A1114 Revision 2 dated January 28, 1999. If the output pressure falls below 23 pounds per square inch gauge (psig) at the engine fuel pump inlet or below 36 psig at the fuel boost pump low pressure switch, the pump must be replaced with a new or serviceable unit according to the Alert Service Bulletin. Secondly, aircraft must not be dispatched with any main fuel boost pump inoperative unless initial testing and any necessary corrective actions have been completed in compliance with Requirement 1. Lastly, all four low pressure switches installed downstream of the main fuel boost pumps must be replaced with higher threshold low pressure switches, in accordance with Boeing SB 737-28A1114 Revision 2. The AD imposes several obligations on the entities it governs. Operators and maintainers of the affected Boeing 737 Series Aeroplanes must ensure that the specified inspections and tests are conducted within the stipulated timeframes. Specifically, inspections and tests must be performed prior to the aircraft accumulating 3,000 flight hours, or within one year from the aircraft's date of manufacture, or within 90 days from the effective date of this AD, whichever occurs first. After the initial compliance, retests must be conducted at intervals not exceeding six months in service until the requirements are fully met. Additionally, operators must ensure that aircraft are not dispatched with any main fuel boost pump inoperative unless the initial testing and any necessary corrective actions have been completed. Finally, the replacement of the low pressure switches must be completed within two years from the effective date of the AD. Failure to comply with the AD may result in significant legal and safety consequences. While the Civil Aviation Regulations 1998 do not explicitly detail the penalties for non-compliance in this context, breaches of ADs can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Such actions may include fines, operational restrictions, or even the grounding of non-compliant aircraft. The severity of the penalty often depends on the nature and extent of the non-compliance, and whether it poses an immediate safety risk. Therefore, adherence to the AD is critical to ensure both regulatory compliance and the safety of air operations.