AD/AT 800/1 - Main Landing Gear P/N 40091-2

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, addresses safety concerns by issuing airworthiness directives, including AD/AT 800/1 for Airtractor 800 Series Aeroplanes. Enacted by the Commonwealth of Australia, these regulations are overseen by the Civil Aviation Safety Authority and aim to ensure that aircraft remain airworthy and safe for operation. The directive mandates the replacement of main landing gear legs for models AT-802 and AT-802A with part number 40091-2 to mitigate the risk of failure caused by a combination of heat treatment and inadequate leg thickness. This directive requires compliance within a specific timeframe or number of landings to prevent potential loss of control during critical phases of flight. The objective of this directive is to enhance safety by addressing a known issue that could compromise the structural integrity of the landing gear, thereby preventing accidents related to gear failure. By requiring compliance within a defined period or number of landings, the Civil Aviation Safety Authority seeks to proactively manage risks associated with the identified defect, ensuring that Airtractor 800 Series Aeroplanes maintain their airworthiness and continue to meet safety standards.

Scope and Application

The Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998, specifically in Part 39 - 105, mandates the implementation of Airworthiness Directives (AD) aimed at ensuring the safety of civil aircraft operations. This particular directive, AD/AT 800/1, targets the main landing gear legs of Airtractor 800 Series aeroplanes, specifically models AT-802 and AT-802A, which are equipped with parts numbered 40091-2. The directive applies universally to these specific models and serial numbers, irrespective of the operator or the location of the aircraft within Australia. The requirement is to replace the main landing gear legs in accordance with specifications outlined in Snow Engineering Co. SL 104A, referencing FAA AD 96-04-08. Compliance must be achieved either before the aeroplane reaches 3001 landings or within 25 landings after 27 March 1996, whichever is the later. If the total number of landings is not recorded, it must be calculated by using the standard rate of three landings per hour of time in service. This directive is critical in preventing the failure of the main landing gear leg, which could potentially result in loss of control during critical phases of flight such as landing or take-off.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes an Airworthiness Directive (AD) that pertains to Airtractor 800 Series Aeroplanes, identified by serial numbers AT-802 and AT-802A, equipped with P/N 40091-2 main landing gear legs (AD/AT 800/1). This directive requires the replacement of the main landing gear legs in accordance with Snow Engineering Co. SL 104A. It is noted that the Federal Aviation Administration (FAA) issued a corresponding AD, AD 96-04-08, which underscores the international nature of this safety concern. The directive mandates compliance before the aeroplane reaches 3001 landings, or within 25 landings after 27 March 1996, whichever is later. In cases where the exact number of landings is not recorded, operators are instructed to estimate by calculating three landings per hour of time in service. Operators and owners of the specified Airtractor 800 Series aeroplanes must adhere to the directive by replacing the main landing gear legs as per the outlined specifications in Snow Engineering Co. SL 104A. This requirement is designed to mitigate the risk of landing gear failure, which can potentially lead to loss of control during landing or takeoff. Ensuring compliance involves either monitoring the aeroplane's landing count or calculating the equivalent number of landings based on operational hours. Given the safety implications, operators are obligated to ensure that the replacement is carried out by qualified personnel and that the new landing gear meets the specified standards. Failure to comply with the Airworthiness Directive could result in severe consequences. Although the specific penalties for non-compliance are not detailed in the provided text, it is implied that breaches of safety directives can lead to significant civil and criminal liabilities under the Civil Aviation Act 1988. Such penalties may include fines, enforcement actions, or even criminal charges if the non-compliance is deemed to have caused harm or endangered lives. The directive’s purpose is to prevent potential accidents, highlighting the importance of adhering to the stipulated safety requirements.