AD/PR/20 - Hub Front Face to Snout Radius - Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39, was enacted to regulate civil aviation safety in Australia, ensuring that aircraft and their components meet stringent safety standards. This legislative instrument, administered by the Civil Aviation Safety Authority, aims to maintain and enhance aviation safety across the country by imposing mandatory safety directives. One such directive, AD/PR/20, addresses the inspection of variable pitch propellers, particularly those manufactured by Dowty Rotol, to identify any potential cracking on the hub front face to dome mount radius. This was introduced to mitigate the risk of in-service failures that could compromise flight safety. The policy objective is to mandate regular, systematic inspections to ensure the ongoing airworthiness of specified propeller models, thereby contributing to the overall safety of civil aviation operations. The Civil Aviation Regulations 1998, under the oversight of the Civil Aviation Safety Authority, establish critical safety standards for the aviation industry. Among these regulations, AD/PR/20 specifically targets the inspection of certain Dowty Rotol variable pitch propellers to detect any structural flaws that could endanger flight safety. This directive applies to specific propeller models that have not been modified according to Modification VP 2388, requiring inspections to be conducted using an approved eddy current technique, such as NAC Eddy Current Technique TB-61-10 F3201 NAC9. The purpose of this regulation is to ensure the ongoing safety and reliability of these propellers by mandating inspections at regular intervals, thus reinforcing the commitment to maintaining high safety standards in Australian civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107, applies to the inspection of certain Dowty Rotol propellers to ensure their continued airworthiness. This regulation is pertinent to all model (c) R175/4-30-4/13E, (c) R186/4-30-4/16 and 16/1, and (c) R212/4-30-4/22/1 propellers that have not been modified in accordance with Modification VP 2388. The requirement mandates that the hub front face to dome mount radius of these propellers be inspected for cracking using an approved eddy current technique. This inspection must occur within 1500 hours of time in service after 30 September 1978 and subsequently at intervals not exceeding 1500 hours. The NAC Eddy Current Technique TB-61-10 F3201 NAC9 is noted as an approved method for these inspections. This regulation is applicable nationally within Australia, governed by the Civil Aviation Safety Authority, and ensures the safety standards are met across all relevant industries and operators of these specified propellers.

Key Provisions

The Civil Aviation Regulations 1998, specifically under Part 39 and Airworthiness Directive AD/PR/20, address the inspection requirements for certain Dowty Rotol variable pitch propellers. The directive applies to models (c) R175/4-30-4/13E, (c) R186/4-30-4/16 and 16/1, and (c) R212/4-30-4/22/1, unless they have been modified in accordance with Modification VP 2388 (section 39-107). The primary requirement outlined is that these propellers must be inspected for cracking on the hub front face to dome mount radius using an approved eddy current technique. This inspection must be conducted within 1500 hours of time in service after 30 September 1978, and subsequently at intervals not exceeding 1500 hours. These regulations impose several obligations on the parties involved. Operators of the specified propeller models must ensure that the inspections are carried out in strict accordance with the approved eddy current technique, as noted in the NAC Eddy Current Technique TB-61-10 F3201 NAC9. Additionally, operators must maintain records of these inspections to demonstrate compliance with the requirements set out in the Civil Aviation Regulations. Failure to adhere to these inspection protocols could result in safety risks, as the presence of cracks in the specified areas could compromise the structural integrity of the propellers, leading to potential in-flight failures. Non-compliance with the inspection requirements outlined in the Civil Aviation Regulations 1998 can result in significant civil and criminal consequences. The Civil Aviation Safety Authority (CASA) may take enforcement action against operators who fail to meet the mandated inspection intervals. Such actions could include fines, enforcement notices, and in severe cases, the grounding of the aircraft until compliance is achieved. The maximum penalties for non-compliance are not explicitly stated in the directive, but generally, under Australian aviation law, penalties can be substantial and may include fines up to several thousand dollars and potential imprisonment for individuals responsible for the oversight of the non-compliant aircraft or propellers. Ensuring adherence to these regulations is crucial to maintaining the high safety standards required in civil aviation operations.