AD/CHA/17 - Wing Strut and Spar Attachment Bolt

Overview

The Civil Aviation Regulations 1998, specifically within Part 39 - 105, addresses the safety of aircraft through various airworthiness directives. One such directive, AD/CHA/17, pertains to the maintenance and inspection of certain American Champion (Aeronca, Bellanca) series aeroplanes. This directive was enacted by the Civil Aviation Safety Authority and is intended to ensure the ongoing airworthiness of these aircraft by addressing potential structural issues with the wing strut and spar attachment bolts. The policy objective is to mitigate the risk of in-flight failures, thereby enhancing the safety of air travel. The directive applies to all model 8GCBC and 8KCAB aircraft and requires the retirement of specific bolts from service at prescribed intervals based on the aircraft's flight hours. For aircraft that have accumulated 1000 hours of service, inspections and bolt retirements must occur within 200 hours after a specified date, with subsequent inspections at intervals not exceeding 1200 hours. For other aircraft, inspections and bolt retirements must occur at intervals not exceeding 1200 hours. This proactive approach aims to maintain the structural integrity of the aircraft and prevent any potential catastrophic failures during flight.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105 concerning the Civil Aviation Safety Authority’s Schedule of Airworthiness Directives, applies to all model 8GCBC and 8KCAB American Champion (Aeronca, Bellanca) series aeroplanes. This legislation mandates the retirement of specified wing strut and spar attachment bolts to ensure the continued safety of these aircraft in operation. The regulations are applicable to all entities operating these particular aircraft models within Australia, governed by the Commonwealth, ensuring a consistent standard of airworthiness across the nation. There are no stated exclusions or exemptions within the scope of this directive; however, the requirement to retire specific bolts varies based on the aircraft's accumulated flight hours. The legislation extends its application through the specified intervals of compliance, ensuring regular maintenance checks and adherence to safety standards for the longevity and safety of these aircraft in Australian airspace.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, which pertains to the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, outlines critical safety requirements for American Champion (Aeronca, Bellanca) Series Aeroplanes, including models 8GCBC and 8KCAB. Section (AD/CHA/17) mandates that certain bolts must be retired from service to ensure the safety of these aircraft. These include the front and rear wing strut upper and lower attachment bolts as well as the front and rear wing spar to fuselage attachment bolts. The compliance requirements detailed in this legislation are stringent and vary based on the aircraft's service history. For aircraft that have achieved 1000 hours of time in service, the bolts must be retired within 200 hours of time in service following 30 November 1977 and then at intervals not exceeding 1200 hours thereafter. For aircraft with less than 1000 hours of service, the bolts must be checked and potentially retired at intervals not exceeding 1200 hours of time in service. Additionally, for 8KCAB aircraft, each hour spent in aerobatics is counted as equivalent to 10 hours of normal flight time. The obligations imposed by these regulations are clear and must be strictly adhered to by the owners and operators of these aircraft. Owners must ensure that the specified bolts are inspected and, if necessary, replaced or retired to maintain the airworthiness of the aircraft. This involves regular maintenance checks and record-keeping to demonstrate compliance with the prescribed intervals. Operators must also be vigilant in ensuring that these inspections and replacements are conducted on time, as failure to do so can result in significant safety risks. Failure to comply with these regulations can lead to serious consequences. The legislation does not explicitly state the penalties for non-compliance, but under general aviation safety laws, breaches can result in substantial fines, potential grounding of the aircraft, and other civil or criminal penalties. The exact penalties would depend on the severity of the breach and could include fines up to several thousand Australian dollars, as well as criminal charges for those responsible for the oversight. Ensuring adherence to these directives is crucial not only for the safety of the aircraft and its occupants but also to avoid legal repercussions.