COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Propellers - Variable Pitch - Hamilton Standard
AD/PHS/13 Hub Rework 4/89 DM
Applicability: All model 14SF-5 and 14SF-7 propellers P/No 792000-3 with S/No as detailed in the requirement document fitted to, but not limited to, De Havilland Dash 8 and Aerospatiale ATR 42 aircraft.
Requirement: Action in accordance with Hamilton Standard Alert Service Bulletin 14SF-61-A22.
Compliance: Unless previously carried out by 30 April 1989, or prior to completing 200 hours time-in service whichever occurs earlier.
Background: The bearing race seats and bolt torque plate seat were incorrectly shot peened during manufacture.
Overview
The Civil Aviation Regulations 1998, enacted by the Australian Government, establish and regulate the standards and practices for ensuring the safety of civil aviation in Australia. Part 39 of these regulations, specifically Airworthiness Directives concerning propellers, addresses potential safety risks and operational deficiencies through mandatory compliance measures. One such directive, AD/PHS/13, pertains to the rework of hubs on Hamilton Standard variable pitch propellers, specifically model numbers 14SF-5 and 14SF-7, with particular serial numbers. This directive was introduced to rectify a manufacturing defect where the bearing race seats and bolt torque plate seats were incorrectly shot peened, leading to potential safety hazards. The policy objective is to ensure that such defects are identified and corrected to maintain the airworthiness of the aircraft involved, thus safeguarding both passengers and crew. Compliance with these directives is mandatory for the specified propellers, requiring adherence to Hamilton Standard Alert Service Bulletin 14SF-61-A22 before a specified operational threshold is reached.
Scope and Application
The Civil Aviation Regulations 1998, specifically Part 39 - 107, encompasses Airworthiness Directives that apply to the maintenance and operation of aircraft in Australia. One such directive, AD/PHS/13, pertains to the rework of the hub for certain Hamilton Standard variable pitch propellers, namely the model 14SF-5 and 14SF-7 with part number 792000-3, which are installed on aircraft such as the De Havilland Dash 8 and Aerospatiale ATR 42. This directive applies to any propeller serial number as detailed in the requirement document, and its scope is limited to ensuring the structural integrity and operational safety of these specific propellers. The directive mandates that rework on the hub be carried out in accordance with Hamilton Standard Alert Service Bulletin 14SF-61-A22, with compliance required unless the specified action was previously undertaken by 30 April 1989 or before the propeller accumulates 200 hours of service time, whichever occurs earlier. The directive is a Commonwealth regulation and applies across the nation, with no stated exclusions or exemptions within the scope of this particular directive. The application of this directive may be extended or clarified through subordinate instruments issued by the Civil Aviation Safety Authority.
Key Provisions
The Civil Aviation Regulations 1998, specifically Part 39 - 107, establish a schedule of airworthiness directives that mandate certain actions to ensure the safety and airworthiness of aircraft components. Section AD/PHS/13 pertains to propellers, more specifically, variable pitch Hamilton Standard propellers. This directive applies to all model 14SF-5 and 14SF-7 propellers with certain part numbers and serial numbers (Section 4/89). The directive is particularly relevant to aircraft such as the De Havilland Dash 8 and Aerospatiale ATR 42.
The primary requirement of this directive is that the hub of the propellers must be reworked in accordance with Hamilton Standard Alert Service Bulletin 14SF-61-A22. This action must be carried out unless it has already been performed by 30 April 1989 or before the propellers accumulate 200 hours of time-in-service, whichever comes first. The rework is necessary because the bearing race seats and bolt torque plate seat were incorrectly shot peened during the manufacturing process, which could potentially compromise the structural integrity of the propeller.
Entities and individuals subject to this directive must ensure that the specified rework is completed on the affected propellers. This includes aircraft operators, maintenance organisations, and any other entities responsible for the upkeep and airworthiness of the aircraft in question. Ensuring compliance involves conducting a thorough inspection of the propellers to identify those that require the rework, and subsequently performing the rework as detailed in the Hamilton Standard Alert Service Bulletin.
Failure to comply with the requirements set out in AD/PHS/13 can result in serious consequences. Non-compliance with airworthiness directives can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). Depending on the severity and the impact on safety, penalties can include fines, suspension or revocation of air operator certificates, and other regulatory sanctions. The potential penalties underscore the importance of adhering to these directives to maintain the highest standards of aviation safety.