AD/DHC-6/23 - Inverter Fuses - Replacement

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, form a comprehensive regulatory framework governing civil aviation within Australia. A specific component of these regulations is Part 39, which includes the Schedule of Airworthiness Directives. One such directive, AD/DHC-6/23, pertains to the DHC-6 (Twin Otter) series aeroplanes and mandates the replacement of inverter fuses. This directive applies to all models with serial numbers ranging from 6 to 427, excluding serial number 426, and those equipped with PC15 and PC15A inverters. The directive references De Havilland of Canada Service Bulletin No. 6/263, and compliance is required before 30 January 1976. The objective of these regulations is to ensure the safety and airworthiness of aircraft operating within Australian airspace, thereby addressing potential safety hazards and maintaining high standards in civil aviation.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, Part 39 - 105, applies to all DHC-6 (Twin Otter) series aeroplanes with serial numbers from 6 to 427, with the exception of serial number 426, and those fitted with PC15 and PC15A inverters. This legislation mandates the replacement of inverter fuses in compliance with De Havilland of Canada Service Bulletin No. 6/263. The directive must be adhered to before 30 January 1976, ensuring that all specified aircraft meet the safety standards set by CASA. The scope of this legislation is focused on maintaining the airworthiness of the affected aircraft models by addressing potential safety hazards associated with the inverter fuses. The application of these regulations is national, extending across the entire Commonwealth of Australia, thereby ensuring consistent safety protocols are uniformly enforced.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, establish the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. One such directive, AD/DHC-6/23, pertains to the replacement of inverter fuses on DHC-6 (Twin Otter) Series aeroplanes. According to section 11/70, this directive applies to all models with serial numbers ranging from 6 to 427, excluding serial number 426, and those fitted with PC15 and PC15A inverters. The directive references De Havilland of Canada Service Bulletin No. 6/263 for compliance guidelines. Importantly, compliance is required before 30 January 1976, ensuring the safety and airworthiness of the aircraft. The obligations imposed by this directive are straightforward yet critical. Operators and owners of DHC-6 Twin Otter Series aeroplanes within the specified serial number range must ensure that the inverter fuses are replaced as per the guidelines outlined in the referenced service bulletin. This involves a thorough inspection and, where necessary, replacement of the fuses to maintain compliance with the airworthiness standards set by CASA. Ensuring that these changes are made before the stipulated date is essential to avoid any safety risks. Failure to comply with AD/DHC-6/23 may lead to significant consequences. CASA has the authority to take action against entities that do not adhere to the directive. The potential penalties for non-compliance can include substantial fines and legal action. The exact penalties may vary depending on the severity and frequency of the non-compliance but can be severe given the safety implications of airworthiness directives. The directive aims to ensure that all regulated aircraft meet the necessary safety standards, and failure to do so can result in serious repercussions for the operators involved.