AD/M20/21 - Engine Mount - Inspection and Repair

Overview

The Civil Aviation Regulations 1998, specifically within Part 39, encompasses a range of safety directives designed to ensure the airworthiness of aircraft. One such directive, AD/M20/21, pertains to the Mooney M20 Series aeroplanes, focusing on the engine mount inspection and repair requirements. This directive was enacted to address potential safety issues related to the structural integrity of the engine mounts, ensuring that these components are maintained to prevent any in-flight failures. The policy objective, as outlined in the Civil Aviation Safety Authority's regulations, is to mandate regular inspections and necessary repairs to maintain the safety standards of these aircraft. The applicability of this directive spans a specific range of serial numbers for various models of the Mooney M20 aeroplanes, ensuring that all affected aircraft are subject to the required maintenance protocols. The enactment of this directive by the Civil Aviation Safety Authority is aimed at mitigating risks associated with engine mount failures, which could potentially compromise the safety of the aircraft and its occupants. By setting forth detailed compliance requirements, including specific time intervals for inspections and the use of referenced Service Bulletins for repair procedures, the regulation seeks to ensure that all Mooney M20 Series aeroplanes meet the necessary safety standards. This approach underscores the commitment to aviation safety and the proactive measures taken to address and rectify potential safety concerns.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, applies to the Mooney M20 series aeroplanes identified in the Civil Aviation Safety Authority Schedule of Airworthiness Directives. This legislation mandates that particular models of the Mooney M20 aeroplanes, based on their serial numbers, must comply with specific inspection and repair requirements for their engine mounts. The scope of the legislation includes Mooney M20C, M20D, M20E, M20F, and M20G models with designated serial numbers, necessitating adherence to the outlined service bulletin, M20-192. The legislation applies across the Commonwealth of Australia, reflecting its national reach and jurisdiction. Compliance requires that engine mounts which have accrued 450 hours of service must be inspected within 50 hours of the directive's issuance date, 19 May 1975, and then at intervals not exceeding 100 hours thereafter until they are repaired or replaced. Other engine mounts must be inspected before reaching 450 hours of service and subsequently at the same 100-hour intervals. This directive does not exclude any entities or conduct outside the specified models and serial numbers, and it extends its reach through the subordinate service bulletin M20-192, detailing the required actions for compliance.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39 - 105, mandate specific safety directives for certain Mooney M20 Series aeroplanes. Section 5/75 of the Mooney M20 Series Aeroplanes AD/M20/21 outlines the requirements for inspecting and repairing the engine mounts of these aircraft. The regulation applies to various models and serial numbers of the Mooney M20C, M20D, M20E, M20F, and M20G series, with specific serial number ranges detailed in the document. Compliance with these regulations is crucial to ensure the continued airworthiness of these aircraft. The primary operative sections of the regulation (sections 1 and 2) require that engine mounts achieving 450 hours of time in service undergo inspection within 50 hours after 19 May 1975 and subsequently at intervals not exceeding 100 hours until repaired or replaced. For engine mounts that have not yet reached 450 hours of service time, inspections must occur before reaching this threshold and then at the same 100-hour intervals. Detailed procedures for these inspections and repairs are provided in Mooney Service Bulletin No. M20-192. The obligations imposed by this regulation are clear and specific. Operators of Mooney M20 Series aeroplanes must ensure that all relevant engine mounts are inspected and repaired or replaced as per the directives outlined in the Service Bulletin. This involves regular and meticulous maintenance schedules, with particular attention to the 450-hour service time milestone. Non-compliance with these provisions could result in the aircraft being deemed unairworthy, posing significant safety risks. Failure to adhere to the requirements set out in the Civil Aviation Regulations 1998 can lead to serious consequences. Section 5/75 does not explicitly outline penalties or offences, but non-compliance can result in actions by the Civil Aviation Safety Authority (CASA). Potential outcomes include fines, enforcement actions, and the grounding of non-compliant aircraft. The exact penalties would be determined in the context of the specific breach and the severity of the non-compliance. Ensuring adherence to these regulations is therefore essential to avoid such repercussions and maintain the highest safety standards in civil aviation.