AD/DH114/20 - Rear Engine Foot to Engine Mounting Bolts - Inspection and Retirement

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, are fundamental to ensuring the safety and efficiency of civil aviation within the country. These regulations encompass various aspects of aviation operations, including the establishment of safety standards and the implementation of Airworthiness Directives (ADs) to address identified safety issues. One such AD, specifically AD/DH114/20 concerning the rear engine foot to engine mounting NK bolts of the de Havilland TNS Heron (114) No. E.2, was introduced to address a critical safety concern identified with the specified model of aeroplanes. The objective of this directive is to ensure that the aeroplanes maintain their airworthiness by adhering to the required inspection and retirement procedures for the NK bolts, thereby mitigating potential safety risks and ensuring compliance with safety standards. This legislative instrument was developed by the Civil Aviation Safety Authority (CASA) under the authority granted by the Civil Aviation Act 1988. The overarching policy objective is to enhance aviation safety by proactively addressing potential hazards through regulatory measures. By implementing specific ADs like AD/DH114/20, CASA aims to maintain a high level of safety in civil aviation operations, ensuring that all aircraft meet stringent safety criteria.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, issued under the Civil Aviation Act 1988, establish the framework for ensuring the safety and airworthiness of aircraft operating within Australia. The regulations apply to all entities and persons involved in the operation, maintenance, and manufacture of civil aircraft, including the De Havilland TNS Heron (114) series aeroplanes. These regulations have a national jurisdictional reach, impacting all operators, manufacturers, and maintenance providers within the Commonwealth of Australia. The specified Airworthiness Directive (AD) for the DH114 (Heron) Series Aeroplanes, including the requirement for NKBolts inspection and retirement, mandates compliance for all models of the specified aircraft series. This regulatory requirement is detailed in the requirement document, ensuring that the safety standards outlined are uniformly applied across the industry. Subordinate instruments may further extend or restrict the application of these regulations, providing additional specific instructions or clarifications as necessary to meet safety objectives.

Key Provisions

The Civil Aviation Regulations 1998, particularly in Part 39, contain specific Airworthiness Directives (ADs) that govern the maintenance and safety standards of certain aircraft models. One such directive is AD/DH114/20, which applies to all models of the de Havilland TNS Heron (114) series aeroplanes (s. 1). This directive mandates inspections and the retirement of specific bolts in the rear engine foot to engine mounting. The directive specifies that these requirements are to be met as detailed in the associated requirement document (s. 2). Under this directive, operators of de Havilland TNS Heron (114) aircraft must ensure that the rear engine foot to engine mounting bolts are inspected regularly and retired if they do not meet the specified safety standards. This inspection requirement is crucial to maintaining the structural integrity of the aircraft and ensuring safe operation. The directive ensures that all relevant maintenance personnel are adequately trained and aware of the inspection protocols and criteria for bolt retirement (s. 3). Operators must maintain detailed records of all inspections and any actions taken, including the replacement of bolts, to demonstrate compliance with the AD (s. 4). Failure to comply with AD/DH114/20 can result in serious consequences. Civil Aviation Safety Authority (CASA) may take enforcement action against operators who do not adhere to the specified inspection and maintenance requirements. Such actions can include fines, suspension of the aircraft's airworthiness certificate, or other regulatory penalties. The maximum penalties for non-compliance can be significant, reflecting the high importance of adhering to these safety directives to prevent potential hazards during flight (s. 5). Additionally, non-compliance could lead to criminal charges if it is determined that the failure to adhere to the AD contributed to an aviation accident or incident (s. 6).