Overview

The Civil Aviation Regulations 1998 were enacted to provide a comprehensive framework for the regulation of civil aviation in Australia, addressing safety, operational standards and compliance. One of the key components of this regulatory structure is Part 39, which pertains to airworthiness directives. These directives aim to ensure that aircraft remain in a safe condition for operation by specifying requirements and procedures for inspections, maintenance, and repairs. The Civil Aviation Safety Authority (CASA) issues these directives to address specific safety concerns and ensure consistent application across the industry. One such directive, AD/SWSA226/53 Amendment 1, targets the Fairchild (Swearingen) SA226 and SA227 series aeroplanes, focusing on the inspection and maintenance of primary control cables to mitigate the high failure rates observed in overseas operations. This directive is intended to enhance the safety and reliability of these aircraft by mandating regular and thorough inspections of critical control cables. The policy objective behind AD/SWSA226/53 Amendment 1 is to ensure the continued airworthiness of Fairchild (Swearingen) SA226 and SA227 series aeroplanes by addressing the high failure rates of control cables in high-time aircraft. This was prompted by overseas experience indicating significant issues with control cable integrity in these models. The directive sets specific inspection intervals and criteria to identify and rectify cable damage before it compromises the aircraft’s safety. By requiring inspections at defined intervals and stipulating rejection criteria, CASA aims to proactively manage and mitigate the risks associated with control cable failures, thereby maintaining the highest standards of aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to Fairchild (Swearingen) SA226 and SA227 series aeroplanes, imposing mandatory requirements on all models of these aircraft. This Act mandates inspections of elevator, rudder, aileron, and aileron to rudder interconnect primary control cables to ensure they meet safety standards. The inspection must check for general condition, broken wires, and wear, with specific attention to the internal condition where the cables contact pulleys or fairleads. The geographic reach of this legislation is national, applying throughout the Commonwealth of Australia, and it extends to all aircraft registered under the Civil Aviation Regulations. The regulations stipulate strict rejection criteria and require the inspection of cables at specified intervals based on the aircraft's time in service, with additional inspections required under certain conditions. Exemptions and substitutions may apply, but the primary requirement for routine inspections remains, even if cables are replaced at 10,000-hour intervals. This Act does not explicitly extend its application through subordinate instruments but relies on the overarching framework of the Civil Aviation Regulations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate detailed inspection and maintenance protocols for Fairchild (Swearingen) SA226 and SA227 series aeroplanes through Airworthiness Directives (AD). Section AD/SWSA226/53 Amendment 1 focuses on the inspection and maintenance of control cables. Operators are required to inspect all elevator, rudder, aileron, and aileron-to-rudder interconnect primary control cables for their general condition and broken wires, which are defined as wires worn more than 50% of their diameter (Section 1). These inspections must cover the entire length of the cables, including those routed inside the control column, and especially around pulleys or fairleads where the cables must be slightly untwisted to inspect for wear, broken wires, and general condition over a distance of 600 mm on either side of the control neutral position contact point (Section 2). Operators must adhere to specific rejection criteria: if more than three broken wires are found within any 300 mm section of a cable, the cable is to be rejected (Section 3(a)). Similarly, if the total number of broken wires exceeds three times the length of the cable in metres, or if more than six wires are worn less than 50% of their diameter in any 25 mm length of cable, the cable must also be rejected (Section 3(b) and (c)). When such discrepancies are found, the associated fairleads or pulleys must be inspected for damage and any unserviceable items must be replaced (Section 4). The compliance requirements state that inspections must be conducted prior to the aircraft attaining 10,000 hours of time in service and every 400 hours thereafter (Section 5(a)). For aircraft that have already exceeded 10,000 hours of time in service as of 9 April 1987, inspections must occur within 100 hours of that date or at the next inspection for Maintenance Release issue after 9 April 1987, whichever is later (Section 5(b)). Breaching the provisions of these Civil Aviation Regulations can result in significant consequences. Operators failing to comply with the specified inspection and maintenance protocols may face civil penalties. The exact penalties are not specified within the text but are generally aligned with the broader regulatory framework governing civil aviation safety in Australia, which can include fines and other administrative actions. Furthermore, operating an aircraft that does not meet the safety standards set by these regulations could lead to serious safety risks, potentially resulting in criminal charges if such non-compliance contributes to an aviation accident or incident. Ensuring strict adherence to these regulations is thus crucial for maintaining the safety and airworthiness of the aircraft in question.