AD/PHS/6 - Model 23e-50, Barrel Bolt Boss - Modification

Overview

The Civil Aviation Regulations 1998, which were enacted in 1998, form a critical part of Australia's aviation regulatory framework, overseen by the Civil Aviation Safety Authority (CASA). This legislation was introduced to ensure the safety and efficiency of civil aviation within Australia, addressing the need for comprehensive regulations governing airworthiness and operations. The Regulations encompass various aspects of aviation, including airworthiness directives, which are essential for maintaining the safety of aircraft and their components. The policy objective underlying these regulations is to provide a robust safety regime that mitigates risks associated with civil aviation, ensuring the highest standards of safety for passengers, crew, and the general public. One such directive, AD/PHS/6, pertains to the modification of the barrel bolt boss on Hamilton Standard Model 23E-50 propellers. This directive aims to ensure that all model 23E-50 propellers comply with specified safety standards before being installed in aircraft. The applicability of this directive extends to all model 23E-50 propellers, and compliance is mandated prior to installation. This directive is grounded in Hamilton Standard Service Bulletin No. 122 (Reference 555) and Australian National Aviation Order 107.1.5.3.5.1, emphasising the importance of adhering to industry standards and safety protocols.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 – 107, applies to all persons and entities involved with the operation, maintenance, and modification of aircraft within Australian airspace. This includes aviation industry professionals such as pilots, engineers, and maintenance personnel, as well as aircraft owners and operators. The scope of this legislation extends to ensuring that all aircraft and their components, including propellers, meet the specified airworthiness standards to guarantee safety. The geographic reach of this regulation is national, encompassing the entire Commonwealth of Australia. This particular airworthiness directive applies to all model 23E-50 propellers, mandating compliance with the specified modification to the barrel bolt boss as outlined in Hamilton Standard SB No. 122 or ANO 107.1.5.3.5.1 before installation in an aircraft. The regulation does not explicitly state any exclusions or exemptions, suggesting a broad application to all relevant propellers within the defined scope. The application of these directives may be further detailed or extended through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 107, establish the Civil Aviation Safety Authority's (CASA) schedule of airworthiness directives, including AD/PHS/6 which pertains to propellers. The regulation targets the modification of the barrel bolt boss for model 23E-50 propellers manufactured by Hamilton Standard (section 1). The directive requires that this modification be implemented on all model 23E-50 propellers (section 2). The applicable documents for compliance are Hamilton Standard Service Bulletin No. 122 (Ref. 555) or the Airworthiness Notice 107.1.5.3.5.1 (section 3). This modification must be completed before the propeller is installed in an aircraft (section 4). Under this regulation, the primary obligation falls on propeller manufacturers and maintenance organisations to ensure that the specified modifications are carried out on all model 23E-50 propellers. This requirement is intended to maintain or improve the airworthiness of the propellers by addressing potential safety issues related to the barrel bolt boss. Compliance with the directive involves following the detailed instructions provided in either Hamilton Standard Service Bulletin No. 122 or the relevant airworthiness notice to ensure the modification is performed correctly and effectively. Failure to comply with the airworthiness directive AD/PHS/6 can lead to serious consequences. The primary concern is the potential risk to flight safety, as the directive is designed to address critical safety issues. Regulatory non-compliance could result in the propeller being deemed unairworthy, which would prevent the aircraft from being certified for flight. Additionally, CASA has the authority to take enforcement actions against individuals or entities that fail to adhere to these directives. These actions may include fines, legal proceedings, or other penalties as prescribed by the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998. The specific penalties can vary depending on the severity of the breach and the circumstances surrounding the non-compliance.