AD/PMC/12 Amdt 3 - Propeller Hub - Replacement

Overview

The Civil Aviation Safety Authority (CASA) established the Civil Aviation Regulations 1998, with subsequent amendments, to ensure the safety and reliability of civil aviation within Australia. One such amendment, F2006B06275, pertains specifically to the maintenance and airworthiness of propellers in certain aircraft. This legislative instrument, introduced as part of the overarching regulatory framework, targets the safety gap associated with the variable pitch propellers manufactured by McCauley. The primary objective is to mandate the replacement of propeller hubs in specified models of Cessna 336 aircraft to mitigate potential safety risks, thereby ensuring the continued safe operation of these aircraft within Australian airspace. The compliance requirement necessitates the removal of the propeller hub before it accumulates 500 hours of total service time, underscoring CASA’s commitment to proactive safety measures in civil aviation.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically in Part 39 - 107, mandates the application of Airworthiness Directives concerning propellers, particularly those of the variable pitch type manufactured by McCauley. This legislation applies to McCauley propellers installed in the rear position of certain Cessna 336 aircraft models, namely the D2AF34C56 series and the D2AF34C61 series, excluding those incorporating AD/PMC/20 (SB 88). The requirement necessitates the removal of the propeller hub from service before it exceeds 500 hours of total time in service, with the possibility of reusing the hub if it incorporates the specified AD/PMC/20 (SB 88). This directive is a Commonwealth regulation, impacting aviation entities and individuals involved in the operation and maintenance of the specified aircraft models within Australia's jurisdiction. The scope of this legislation ensures adherence to stringent safety standards, thereby enhancing the reliability and safety of civil aviation operations.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 107, outlines the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, detailing mandatory compliance for various aircraft components. In the context of propellers, AD/PMC/12 Amendment 3 pertains to the replacement of the propeller hub in McCauley propellers installed in the rear position of Cessna 336 aircraft. This directive applies to all model D2AF34C56 series and all model D2AF34C61 series prior to model D2AF34C61-J that have not incorporated AD/PMC/20 (SB 88). According to this directive, the propeller hub must be removed from service to comply with the regulations. It is noteworthy that propeller hubs removed under this directive may be re-used, provided they incorporate AD/PMC/20 (SB 88). The obligations under this directive are clear and demand specific actions to ensure compliance. Operators and owners of Cessna 336 aircraft equipped with the specified McCauley propellers must ensure that the propeller hub is removed from service before it accumulates 500 hours of total time in service. This requirement is non-negotiable and must be adhered to strictly. Furthermore, the removed propeller hubs can be re-used, but only after they have been incorporated with AD/PMC/20 (SB 88), thereby ensuring that the propeller hub meets the updated safety standards. Failure to comply with these directives can lead to significant legal and operational consequences. While the Civil Aviation Regulations 1998 do not explicitly state penalties for non-compliance within this specific directive, general provisions under the Civil Aviation Act 1988 could apply. Non-compliance might result in enforcement actions by CASA, which could include fines, suspension of airworthiness certificates, or other regulatory actions. Additionally, operating an aircraft that does not meet airworthiness standards can lead to severe safety risks, potentially resulting in accidents that could have dire consequences for passengers, crew, and the general public. In summary, AD/PMC/12 Amendment 3 mandates the removal of specific propeller hubs from service in Cessna 336 aircraft to enhance safety and compliance with airworthiness standards. Operators must ensure these hubs are replaced before they reach 500 hours of total time in service, and any re-used hubs must incorporate AD/PMC/20 (SB 88). Non-compliance could lead to regulatory penalties and severe safety implications, highlighting the importance of adhering to these directives.