AD/PHZL/56 - Pitch Change Rod

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, govern various aspects of civil aviation safety, including the maintenance and operation of aircraft components. Part 39 of these regulations pertains to airworthiness directives, which are legally enforceable orders issued by the Civil Aviation Safety Authority (CASA) to address safety issues in aircraft. One such directive, AD/PHZL/56, pertains specifically to Hartzell propellers installed on Garrett TPE-331 turboprop engines. This directive was introduced to address the problem of pitch change rod failure in certain Hartzell propeller models, which could lead to severe asymmetric thrust conditions or engine over-temperature during ground operations with full reverse pitch applied. The policy objective behind this directive is to ensure the continued airworthiness and safety of aircraft by mandating specific actions to be taken during propeller overhauls, as outlined in Hartzell Service Bulletin No. 153. Compliance with this directive is required at the next overhaul following 30 September 1987 or before 30 September 1988, whichever occurs first.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107, pertains to the Airworthiness Directives concerning propellers, with a focus on variable pitch propellers manufactured by Hartzell. This regulation applies to all Hartzell propeller models HC-B4(T,M)N-5 fitted with either B-3018S-2 or B-3018T-2 pitch change rods, which are used on Garrett TPE-331 turboprop engines. Notably, these propellers are installed on a variety of aircraft such as the Dornier DO-228, Mitsubishi MU-2, Swearingen SA-226, CASA C-212, Beech B100, and Shorts SC-7. The directive mandates compliance with Hartzell Service Bulletin No. 153 and requires that corrective action be taken at the next overhaul after 30 September 1987, but before 30 September 1988, whichever comes first. This measure aims to address the risk of pitch change rod failure during ground operation with full reverse pitch, which could lead to severe asymmetric thrust conditions or engine overtemperature. The regulation is enforced under the Civil Aviation Safety Authority, thereby extending its jurisdictional reach across the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically within PART 39 - 107, establish the requirements for airworthiness directives, with a particular focus on propellers in the AD/PHZL/56 section. The regulation in question, AD/PHZL/56, addresses the critical issue of pitch change rod failures in Hartzell propellers. Section 107 mandates compliance with Hartzell Service Bulletin No. 153 for all Hartzell propeller models HC-B4(T,M)N-5 fitted with either B-3018S-2 or B-3018T-2 pitch change rods. These propellers are commonly installed on Garrett TPE-331 turboprop engines, and are used in aircraft such as the Dornier DO-228, Mitsubishi MU-2, Swearingen SA-226, CASA C-212, Beech B100, and Shorts SC-7. The directive requires compliance by the next overhaul following 30 September 1987 or before 30 September 1988, whichever comes first. Under this regulation, the primary obligations fall upon aircraft operators and maintenance providers who must ensure that the affected propellers are inspected and repaired or replaced as necessary to conform with Hartzell Service Bulletin No. 153. This involves meticulous adherence to the service bulletin's guidelines, which likely include detailed inspection procedures, replacement parts specifications, and corrective actions. Operators must ensure that these measures are implemented promptly to maintain the airworthiness of their aircraft. Failure to comply with these directives can result in significant safety risks, including the potential for severe asymmetric thrust conditions or engine over-temperature, which could lead to catastrophic failure during flight. The consequences of non-compliance with the Civil Aviation Regulations 1998 are severe. Breaching the provisions of AD/PHZL/56 can result in enforcement actions by the Civil Aviation Safety Authority (CASA). Potential penalties may include fines, enforcement notices, and in extreme cases, grounding of the affected aircraft. The maximum penalty for non-compliance can be substantial, reflecting the critical nature of maintaining airworthiness standards to ensure public safety. The specific penalties are determined based on the severity and frequency of the breach, with repeat offenders facing increased penalties. Furthermore, non-compliance could lead to legal action against the operator, resulting in civil liabilities and potential criminal charges for those responsible for the oversight of maintenance procedures.