AD/DH114/38 - Drag Bracing Member, Centre Section Spar Lower Boom - Inspection and Replacement

Overview

The Civil Aviation Regulations 1998, which were enacted by the Parliament of the Commonwealth of Australia, aim to ensure the safety of civil aviation operations within Australian airspace. One specific aspect of these regulations is the issuance of Airworthiness Directives (ADs), such as AD/DH114/38, which address identified safety issues and ensure that aircraft meet required safety standards. This particular directive, issued by the Civil Aviation Safety Authority, targets the DH114 (Heron) series aeroplanes, focusing on the inspection and replacement of the drag bracing member, centre section spar lower NK boom. The directive was introduced to address a specific safety concern related to certain models of the DH114 aeroplanes, particularly those with serial numbers prior to 14135 that have not incorporated modifications 1102 or 1103. The policy objective behind this directive is to enhance the structural integrity of the affected aircraft by ensuring that the specified components are inspected and, if necessary, replaced to prevent potential safety risks. This legislative instrument is part of a broader regulatory framework designed to maintain high safety standards in civil aviation. By specifying the need for inspections and replacements within defined timeframes, the Civil Aviation Safety Authority aims to mitigate any risks associated with the identified structural issues in the DH114 aeroplanes. The requirement for compliance with the directive underscores the importance of regular maintenance and adherence to safety protocols to protect both the aircraft and those on board.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, pertain to the Civil Aviation Safety Authority’s schedule of airworthiness directives, which apply to the DH114 (Heron) Series Aeroplanes, particularly those with serial numbers prior to 14135 that do not incorporate modifications 1102 or 1103. These regulations are applicable to all entities and individuals operating such aircraft, ensuring compliance with the safety standards set by the Civil Aviation Safety Authority. The legislation's reach is national, governing civil aviation across Australia. However, it is pertinent to note that the specific airworthiness directive, AD/DH114/38, mandates inspections and replacements of the drag bracing member, centre section spar lower NK boom, as outlined in Hawker Siddeley TNS Heron (114) No. F.18. This involves conducting inspections within 100 hours of time in service after 29 June 1973 or before 1 August 1973, whichever comes first, and replacing the fittings before 1 July 1974. The regulations extend to all relevant aircraft and do not explicitly mention any exclusions or exemptions, though compliance is mandatory for those within its purview.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, Section 105, includes a schedule of airworthiness directives pertaining to specific aircraft models. For the DH114 (Heron) series aeroplanes, Airworthiness Directive AD/DH114/38 addresses the drag bracing member in the centre section spar lower NK boom. This directive applies to all models with serial numbers prior to 14135 that do not incorporate modifications 1102 or 1103 (Section 105.122). It mandates inspections and replacements to ensure the continued airworthiness and safety of these aircraft. Under this directive, operators and owners of the specified DH114 series aeroplanes are required to conduct inspections and, if necessary, replacements of the drag bracing member in the centre section spar lower NK boom. The inspection must be completed in accordance with Paragraph 4 of Technical Notice (TNS) Heron (114) No. F.18, within a specific timeframe: either 100 hours after 29 June 1973 or before 1 August 1973, whichever comes first (Section 105.122(1)). Furthermore, any necessary replacements must be carried out in line with Paragraph 5 of TNS Heron (114) No. F.18, before 1 July 1974 (Section 105.122(2)). Operators and aircraft owners are responsible for ensuring compliance with these directives. This includes conducting the required inspections and making any necessary replacements to meet the specified deadlines. Failure to adhere to these requirements can lead to serious safety implications and potential non-compliance with civil aviation regulations. The onus is on the operators to maintain accurate records of all inspections and actions taken to demonstrate compliance with the AD/DH114/38 directive. Failure to comply with the provisions of AD/DH114/38 can result in serious consequences. Section 105.122(3) stipulates that non-compliance with these airworthiness directives can be considered a breach of civil aviation regulations, potentially leading to enforcement actions. Such breaches may result in penalties, including fines and potential grounding of the aircraft until the required inspections and repairs are completed. The exact penalties are determined by the Civil Aviation Safety Authority (CASA) and can vary based on the severity and frequency of the non-compliance. It is imperative for operators and owners to strictly adhere to these directives to avoid any legal or safety repercussions.