AD/PMC/32 Amdt 1 - Threadless Propeller Hub - Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 107, was enacted to regulate and ensure the safety of civil aviation in Australia. This particular legislative instrument, F2006B06287, addresses the safety concerns related to the threadless propeller hub of McCauley propellers fitted to certain Cessna aircraft models. The enactment by the Commonwealth of Australia aims to prevent potential failures that could compromise the safety of the aircraft. The policy objective is to mandate regular inspections of the propeller hubs to ensure they remain in a safe operational condition, thereby maintaining high safety standards within the aviation industry. This regulation, administered by the Civil Aviation Safety Authority, targets the specific issue of threadless propeller hubs on certain Cessna aircraft models. The focus is on ensuring that these hubs are inspected regularly to prevent failures that could lead to serious safety incidents. By setting clear inspection protocols and timeframes, the regulation seeks to mitigate risks associated with the identified problem, ensuring that aircraft remain airworthy and safe for operation.

Scope and Application

The Civil Aviation Safety Authority Schedule of Airworthiness Directives, specifically AD/PMC/32 Amendment 1, pertains to the inspection of the threadless propeller hub on D2AF34C305 propellers fitted to the rear engine of Cessna model T337G, T337H, and P337H aircraft that have not been modified in accordance with McCauley Service Bulletin No. 132. This directive applies to the aviation industry, specifically to aircraft operators and maintenance personnel, ensuring compliance with safety standards for the specified aircraft models and propellers. The directive outlines a mandatory inspection regime, which includes a visual inspection at each daily or overnight inspection, an inspection within 100 hours of time in service after a specified date, and an inspection whenever the propeller is removed from the engine. These inspections must be conducted in accordance with the detailed procedures outlined in McCauley Service Bulletin No. 128. The directive specifies that the inspection results must be documented on the maintenance release, and the inspection can be performed by the pilot in command, a Licensed Aircraft Maintenance Engineer, or another qualified individual, depending on the context. The scope of this legislation is geographically limited to the Commonwealth of Australia, as it is an instrument of the Civil Aviation Regulations 1998, which apply nationally.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, mandate specific safety directives for certain aircraft components. Under Section 107, there are detailed requirements for the inspection of propeller hubs in certain aircraft models. Specifically, Section AD/PMC/32 Amendment 1 focuses on the inspection of threadless propeller hubs for D2AF34C305 propellers fitted to the rear engine of Cessna model T337G, T337H, and P337H aircraft. This applies to propellers that have not been modified in accordance with McCauley Service Bulletin (SB) No. 132. The primary document for compliance is McCauley SB No. 128. These regulations impose several obligations on the parties involved. Firstly, a visual inspection of the hub must be conducted at each daily or overnight inspection as per Part 1 of McCauley SB No. 128. This inspection is mandatory and must be recorded on the maintenance release as maintenance required, although it can be performed by the pilot in command without additional certification. Additionally, more comprehensive inspections are required within 100 hours of time in service after 24 June 1977 and at intervals not exceeding 100 hours thereafter, as specified in Part 11B of the document. If the propeller is removed from the engine at any time, another inspection must be conducted according to Part 11C of the document, and this inspection can be performed by a Licensed Aircraft Maintenance Engineer. Failure to comply with these inspection requirements can result in serious consequences. Although specific penalties are not detailed in the provided text, non-compliance with safety directives under the Civil Aviation Regulations 1998 can lead to enforcement actions, including fines, grounding of the aircraft, or even criminal charges in cases of significant negligence or safety breaches. The severity of the penalties can depend on the specific circumstances of the non-compliance and the potential risk posed to aviation safety. Ensuring adherence to these directives is critical to maintaining the safety standards set by the Civil Aviation Safety Authority.