COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 107 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Propellers - Variable Pitch - Hartzell
AD/PHZL/58 Piston Nut B474 7/89 DM Applicability: All Hartzell propellers model HC-A6A-3 installed on Shorts SD3-60-300 aircraft. Requirement: 1. Action in accordance with Procedure 1 of Hartzell SB No 163.
2. Action in accordance with Procedure 2 of Hartzell SB No 163.
Compliance: For Requirement 1. Within 100 hours time in service from 19 May 1989, or by 9 June 1989 whichever occurs first. Thereafter re-inspect at intervals not exceeding 100 hours time in service until propeller is modified in accordance with Requirement 2.
For Requirement 2. At next propeller overhaul or by 30 June 1991, whichever occurs first.
Background: The manufacturer has advised that the B-474 nut may not fully contact the piston when correctly torqued and could cause an inadvertent blade angle change. Pending introduction of a new nut indexing of relevant parts is required.
Overview
The Civil Aviation Regulations 1998, specifically within Part 39, introduced the Airworthiness Directives to ensure the safety and airworthiness of aircraft within Australian airspace. The 1998 Regulations were enacted by the Parliament of Australia and aimed to address gaps in the regulation of civil aviation safety, providing a comprehensive framework for maintaining aircraft in a safe and airworthy condition. One such directive, AD/PHZL/58, targets Hartzell propellers model HC-A6A-3 installed on Shorts SD3-60-300 aircraft, addressing the specific issue of the B-474 piston nut potentially causing an inadvertent blade angle change if not fully contacting the piston when correctly torqued. The policy objective behind this directive is to mandate the indexing of relevant parts and to ensure compliance with specific inspection and modification procedures to mitigate safety risks associated with the identified problem.
The directive requires action in accordance with specified procedures of Hartzell Service Bulletin No 163, with stringent timelines for initial inspection and subsequent re-inspection intervals until the propeller is modified. The regulation mandates compliance within specific timeframes, ensuring that the necessary safety measures are implemented without delay. This legislative measure underscores the commitment to maintaining high safety standards in civil aviation, reflecting the regulatory intent to prevent potential hazards that could compromise aircraft safety.
Scope and Application
The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically within Part 39 - 107, mandates the application of Airworthiness Directives for certain propellers. The directive AD/PHZL/58 concerns Hartzell propellers model HC-A6A-3 installed on Shorts SD3-60-300 aircraft. The directive is designed to address potential safety issues with the B-474 nut, which may not fully contact the piston when correctly torqued, leading to an inadvertent blade angle change. The directive requires two main actions: first, compliance with Procedure 1 of Hartzell Service Bulletin No 163 within 100 hours of time in service from 19 May 1989, or by 9 June 1989, whichever occurs first, and then further re-inspection at intervals not exceeding 100 hours time in service until the propeller is modified as per Procedure 2. The second requirement necessitates modification at the next propeller overhaul or by 30 June 1991, whichever comes first. This regulation applies directly to the specified propeller model installed on the designated aircraft type, ensuring ongoing airworthiness and safety within the Australian aviation sector.
Key Provisions
The Civil Aviation Regulations 1998, under Part 39 - 107, includes a specific Airworthiness Directive (AD) concerning Hartzell propellers. The directive, AD/PHZL/58, pertains to piston nut B474 and applies to all Hartzell propellers model HC-A6A-3 installed on Shorts SD3-60-300 aircraft. The directive mandates two primary actions. Firstly, operators must follow Procedure 1 of Hartzell Service Bulletin No 163. Secondly, they must adhere to Procedure 2 of the same bulletin (section 1).
The directive imposes specific timelines and intervals for compliance. For the first requirement, the action must be taken within 100 hours of the directive's publication date, which is 19 May 1989, or by 9 June 1989, whichever comes first. Following the initial compliance, the propeller must be re-inspected at intervals not exceeding 100 hours of time in service until the propeller is modified according to the second requirement (section 2). The second requirement necessitates compliance at the next propeller overhaul or by 30 June 1991, whichever is earlier (section 2).
Failure to comply with the directives may result in significant consequences. The Civil Aviation Safety Authority (CASA) may take enforcement actions against non-compliance, potentially resulting in penalties. While the specific civil or criminal penalties are not detailed in the provided text, it is understood that non-compliance with ADs can lead to fines, aircraft grounding, and other regulatory sanctions. The severity of these penalties can vary based on the nature and extent of the non-compliance, as well as any resultant safety issues.