AD/PAP/5 Amdt 2 - Propeller Fixed Spline - Inspection and Replacement

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, form part of a broader regulatory framework aimed at ensuring the safety and efficiency of civil aviation within Australia. One specific legislative instrument under this Act is AD/PAP/5Amdt 2, which addresses the issue of airworthiness for certain propellers used in aviation. This amendment targets Allison/Aeroproducts propellers models A6441 FN-606 and A6441 FN-606A fitted with fixed splines that are subject to specific inspection and replacement requirements to prevent operational risks. The primary objective of this directive is to mandate inspections and potentially the replacement of non-compliant splines to maintain the safety and airworthiness standards of aircraft propellers, thereby ensuring the continued safety of air travel and adherence to regulatory compliance.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107, applies to all Allison/Aeroproducts propellers model A6441 FN-606 and A6441 FN-606A fitted with certain fixed splines. This regulation mandates inspections, marking, and tests to be conducted on these propellers to ensure they meet specific safety standards. The directive applies to all aircraft operators who use these propellers, requiring them to follow the inspection and testing protocols outlined in Allison telegrams THO-641W-LOD dated 7 April 1967 and THO-662W-LOD dated 10 April 1967, and to perform a double static feather and static reverse check daily until the specified fixed splines are replaced. Additionally, fixed splines that do not meet the specified core hardness requirements must be removed from service before 1 November 1967. The regulations apply nationwide across Australia, governed by the Civil Aviation Safety Authority, and compliance must be achieved within the stipulated timeframes to maintain airworthiness.

Key Provisions

The Civil Aviation Regulations 1998, specifically within Part 39 - 107 and the Civil Aviation Safety Authority's schedule of airworthiness directives, contain important provisions concerning the inspection and replacement of certain propeller fixed splines for Allison/Aeroproducts propellers. According to AD/PAP/5Amdt 2, the directive applies to all Allison/Aeroproducts propellers models A6441 FN-606 and A6441 FN-606A fitted with specific fixed splines (section 10/67). The directive outlines two main requirements. Firstly, the operators must inspect and mark the propellers in accordance with specified Allison telegrams (section 1(a)). Secondly, operators must conduct a double static feather and static reverse check as per the referenced telegrams (section 1(b)). Operators of the affected Allison/Aeroproducts propellers must ensure compliance with these directives. For the inspection and marking as per section 1(a), this must be completed within 10 hours of service after 1 November 1967. The double static feather and static reverse check, as outlined in section 1(b), must be conducted daily until the requirements of section 2 are fulfilled. Section 2 of the directive mandates the removal from service of all specified fixed splines that do not meet the specified core hardness requirements outlined in Allison Commercial SL 189, Page 7, Paragraph B4C. Failure to comply with these directives can lead to severe consequences. While specific penalties are not detailed in the text, non-compliance with airworthiness directives is generally subject to enforcement actions by the Civil Aviation Safety Authority. These actions can include fines, suspension or revocation of aircraft operating certificates, and other regulatory penalties. The severity of the consequences typically depends on the extent and nature of the non-compliance, as well as any resulting safety risks.