AD/AC/39 - Wing Front Spar Lower Cap - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, address the need for stringent safety standards within the aviation industry. This legislative instrument was introduced to ensure the safety and airworthiness of aircraft, particularly in response to identified gaps in aircraft maintenance and inspection protocols. The Civil Aviation Safety Authority (CASA) is tasked with overseeing the implementation and enforcement of these regulations, with the overarching policy objective of maintaining the highest standards of safety for passengers and crew. One example of this commitment to safety is evident in Airworthiness Directive AD/AC/39, which mandates specific inspections of the wing front spar lower cap on Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600, and 700) series aeroplanes. This directive aims to identify and rectify potential structural issues that could compromise the integrity of the aircraft, thereby preventing accidents and ensuring continued safe operation within Australian airspace.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, applies to the Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600 and 700) series aeroplanes. This regulation mandates the inspection of the wing front spar lower cap for specified models, including 560E, 680, and 680E, to ensure the aircraft remain airworthy. The requirement is to inspect the specified parts for damage, double drilled holes, poor rivet fit, or cracking using radiographic techniques such as DCA NDI/R/1 or other methods approved by the Secretary. The inspection must be conducted within 100 hours of time in service after 22 February 1968. This regulation applies across the Commonwealth, overseen by the Civil Aviation Safety Authority, ensuring compliance with safety standards nationwide. The directive does not specify exclusions or exemptions but necessitates adherence by all relevant entities operating the affected aircraft models within Australia’s jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. One such directive, AD/AC/39, pertains to the inspection of the wing front spar lower cap for Twin Commander (Gulfstream/Rockwell/Aerocommander 500, 600 and 700) series aeroplanes. This directive applies to all 560E, 680 and 680E models (Section 2/68). The main requirement (Section 2/68) is that the wing front spar lower cap between wing stations 67 and 86, on both the left and right-hand sides, must be inspected for damaged or double-drilled holes, poor rivet fit, or cracking. This inspection must be conducted using radiographic technique DCA NDI/R/1 or an alternative technique approved by the Secretary. The directive imposes specific obligations on the parties involved. Owners and operators of the affected aircraft must ensure that the required inspections are performed within 100 hours of time in service after 22 February 1968 (Section 2/68). These inspections must be conducted by qualified personnel and must adhere to the specified techniques or approved alternatives. Ensuring compliance with these requirements is essential to maintain the airworthiness of the aircraft and to prevent potential safety issues that could arise from structural defects in the wing front spar lower cap. Failure to comply with the provisions of this airworthiness directive can result in serious consequences. The regulations do not explicitly state the specific penalties or consequences for non-compliance in this particular directive; however, general compliance with CASA's regulations is enforced under broader civil aviation laws. Non-compliance with airworthiness directives can lead to enforcement actions, including fines, grounding of the aircraft, and potential criminal charges for serious violations. The penalties for such breaches can be significant and may include substantial financial penalties as well as the potential for imprisonment, depending on the severity of the non-compliance and its impact on aviation safety.