AD/SF340/18 - Nacelle Drag Strut Bolts, Lower Fittings and Attaching Fasteners

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), were enacted to ensure the safety and efficiency of civil aviation in Australia. One of the specific legislative instruments under this broader regulatory framework is F2006B06946, a directive pertaining to the airworthiness of the SAAB SF340 Series Aeroplanes, particularly focusing on the nacelle drag strut bolts, lower fittings, and attaching fasteners. This legislative instrument was introduced to address safety concerns related to potential structural failures that could arise from loose nuts at the lower drag strut support fitting, a problem that, if unaddressed, could lead to a loss of structural integrity of the power plant installation. The directive mandates compliance with specific timelines and actions as outlined in SAAB Service Bulletin 340-54-026, aligning with international standards set by Swedish authorities. The primary policy objective of this directive is to mitigate the risk of accidents by ensuring that maintenance actions are performed within specified intervals, thus maintaining the airworthiness of the aircraft in question. Compliance with these regulations is crucial for operators to ensure the continued safe operation of SAAB SF340 aircraft, reflecting the overarching goal of the Civil Aviation Regulations 1998 to protect public safety and enhance the reliability of civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to airworthiness directives issued by the Civil Aviation Safety Authority. This particular directive, AD/SF340/18, applies to Saab SF340 Series aeroplanes, more precisely those with serial numbers ranging from -004 to -159 for the SF340A variant and -160 to 166 for the SF340B variant. The directive mandates actions in accordance with SAAB Service Bulletin 340-54-026, which references Swedish AD 1-034, indicating a coordinated international safety measure. The directive is focused on addressing reports of loose nuts at the lower drag strut support fitting, which, if unrectified, could potentially result in the loss of structural integrity of the power plant installation in the event of a double failure. Compliance with the directive involves adhering to specific timelines and conditions: within 200 hours of time in service after 15 January 1990, and at the next engine removal or within 1500 hours of time in service after the same date. The directive applies across the Commonwealth of Australia, ensuring that all relevant aircraft within the specified serial number ranges comply with these safety requirements to maintain airworthiness standards.

Key Provisions

The key operative sections of the Civil Aviation Regulations 1998, specifically AD/SF340/18 concerning the Saab SF340 series aeroplanes, detail the requirements for addressing issues with the nacelle drag strut bolts, lower fittings, and attaching fasteners. Section 2B (1) to (4) mandates that the required action must be taken within 200 hours of time in service after 15 January 1990. Section 2B (5) specifies that the action must occur at the next engine removal or within 1500 hours of time in service after the same date. These sections are designed to ensure the structural integrity of the power plant installation by rectifying potential issues with the drag strut support fitting. The obligations imposed by these sections are clear and demand immediate attention to the specified components of the Saab SF340 aeroplanes. Operators of these aircraft must ensure that they comply with the SAAB Service Bulletin 340-54-026, which addresses the identified issues. Compliance involves conducting inspections and taking corrective actions as outlined in the service bulletin, particularly focusing on the lower drag strut support fitting. This requirement applies to all Saab SF340A series aeroplanes with serial numbers from -004 to -159 and all Saab SF340B series aeroplanes with serial numbers from -160 to -166. Failure to comply with the provisions of the Civil Aviation Regulations 1998 can lead to significant consequences. Section 2B (1) to (4) and Section 2B (5) impose strict timelines for compliance, and non-compliance can result in severe penalties. The potential for loss of structural integrity of the power plant installation due to loose nuts at the lower drag strut support fitting underscores the critical nature of adhering to these regulations. While the specific penalties are not detailed in the excerpt, it is reasonable to infer that violations could lead to enforcement actions by the Civil Aviation Safety Authority, potentially including fines, grounding of the aircraft, or other regulatory sanctions. The overarching goal is to ensure the safety and airworthiness of the aircraft, thereby protecting passengers and crew.