AD/M20/52 - Aileron Control Link

Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, were established to regulate civil aviation safety and ensure the safe operation of aircraft within Australian airspace. Among the various parts of this comprehensive legislation, Part 39, specifically Section 105, addresses Airworthiness Directives, which are critical in maintaining the safety standards of aircraft. The Mooney M20 Series Aeroplanes Airworthiness Directive (AD/M20/52) was introduced to address the problem of aileron control link failures in Mooney M20 aeroplanes. These failures posed significant risks, including the potential loss of aileron control and consequent loss of control of the aircraft. The policy objective behind this directive is to enhance aviation safety by ensuring that Mooney M20 aeroplanes comply with specific maintenance and inspection requirements to prevent such failures. The Mooney M20 Series Aeroplanes AD/M20/52 mandates detailed inspections and, if necessary, the replacement of aileron control links to mitigate the risk of failure. This directive applies to specific Mooney M20 models and serial numbers, requiring a thorough inspection of the aileron control links for the presence of a reinforcement gusset and cracks. If no reinforcement gusset is found, further inspection for cracks is necessary, with cracked links requiring replacement before further flight. This directive, effective from 25 February 1999, aims to maintain the airworthiness of Mooney M20 aeroplanes by enforcing timely inspections and necessary maintenance actions.

Scope and Application

The Mooney M20 Series Aeroplanes Airworthiness Directive (AD/M20/52) applies to specific models and serial numbers of the Mooney M20 aircraft, including the M20B, M20C, M20D, M20E, M20F, M20G, and M20L series of all serial numbers, as well as the M20J from serial number 24-0001 through 24-3359, the M20K from 25-0001 through 25-1999, the M20M from 27-0001 through 27-0197, and the M20R from 29-0001 through 29-0042. This directive, issued under the Civil Aviation Regulations 1998, is enacted by the Civil Aviation Safety Authority and applies to aircraft registered within Australia, thereby impacting the aviation industry and all operators of these specific Mooney M20 models. The directive mandates a visual inspection of the aileron control links to ensure the installation of a reinforcement gusset, with further inspections and potential replacements required if no gusset is found or if cracks are detected. Compliance with this directive is mandatory within 100 hours after 25 February 1999 and subsequently at intervals not exceeding 100 hours. The directive's scope extends to ensuring the airworthiness of these aircraft, directly affecting the safety and operational standards within the Australian aviation sector.

Key Provisions

The main sections of this Airworthiness Directive (AD) concern the inspection and replacement of aileron control links in Mooney M20 Series aeroplanes, specifically models M20B, M20C, M20D, M20E, M20F, M20G, M20L, M20J, M20K, M20M, and M20R within specified serial number ranges. The directive mandates a visual inspection of the aileron control links at the second 90-degree angle joint from the Heim bearing to check for the installation of a reinforcement gusset (Section 1). If a reinforcement gusset is not present, the control links must be inspected for cracks using magnetic particle methods (Section 2). If any cracks are detected, the affected control link(s) must be replaced with an improved design before further flight (Section 2(b)). The replacement of both aileron control links with improved designs may be performed at any time, but must be completed before any further flight if required after the initial inspection (Section 2(b)). The AD imposes several obligations on the operators of the specified Mooney M20 Series aeroplanes. Primarily, operators must ensure that the visual inspection and crack detection processes are conducted according to the instructions provided in Mooney Engineering Design Service Bulletin (SB) M20-264. This includes performing the initial inspection within 100 hours of service time after the AD's effective date of 25 February 1999. If cracks are detected during this inspection, the cracked control link(s) must be replaced with an improved design before any subsequent flight. Additionally, if both control links are replaced, this must be done before any further flight, effectively terminating the repetitive inspection requirement. These inspections must then be repeated at intervals not exceeding 100 hours of service time. Failure to comply with the requirements of this Airworthiness Directive may result in civil or criminal penalties. The AD is enforceable under the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998, which provide for enforcement actions against non-compliance. Violations may lead to penalties including fines, enforcement notices, and potentially criminal charges for more severe breaches. The specific maximum penalties for non-compliance are not detailed in the AD itself but would be subject to the applicable civil aviation legislation. Operators and aircraft owners are expected to adhere strictly to the directive to ensure the continued airworthiness and safety of their aircraft.