AD/TB20/4 - Wing Drainage - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, aim to ensure the safety and efficiency of civil aviation within Australia. Part 39, which includes the Airworthiness Directives (ADs), is particularly focused on maintaining the safety standards of specific aircraft models. One such directive, AD/TB20/4, addresses the wing drainage modification for Aerospatiale (Socata) TB20 (Trinidad) series aeroplanes. This directive was introduced to address a specific safety concern identified in certain model TB20 aircraft with serial numbers up to 433 and 444, focusing on ensuring proper drainage of the wing tip forward spar box. The policy objective is to mitigate risks associated with water accumulation in the wing, thereby enhancing the aircraft's operational safety. The directive mandates compliance by requiring the modification to be completed within 50 hours of time in service after 8 March 1985, unless it has already been carried out.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a directive for the Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes concerning wing drainage modifications. This directive applies to all model TB20 aeroplanes with serial numbers up to 433 and including serial number 444. The directive requires that the wing tip forward spar box modification, as outlined in Aerospatiale SOCATA TB SB No. 26, must be completed within 50 hours of time in service after 8 March 1985, unless the modification has already been accomplished. This legislative instrument is issued under the authority of the Civil Aviation Safety Authority and governs the airworthiness of specified aircraft to ensure safety standards are met. The directive is binding on the owners and operators of the affected aircraft within the Commonwealth of Australia and serves to maintain the safety and reliability of the aircraft in question.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39 - 105, address the Airworthiness Directives for certain aircraft models, including the Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes. The relevant directive in question here is AD/TB20/4, which concerns wing drainage modifications. This directive applies to all Aerospatiale SOCATA TB20 aeroplanes with serial numbers (S/Nos) up to 433 and the specific number 444. According to section 4/85 of the directive, the requirement is to implement modifications as specified in Aerospatiale SOCATA TB SB No. 26. The obligation imposed by this directive is that the specified modification must be carried out unless it has already been accomplished. This modification must be completed within the next 50 hours of time in service after the directive was issued on 8 March 1985. The primary aim of this modification is to ensure proper drainage of the wing tip forward spar box, thereby enhancing the safety and airworthiness of the aircraft. Failure to comply with the requirements outlined in AD/TB20/4 may result in serious legal and safety implications. The regulations do not explicitly state penalties in the provided text, but non-compliance with Civil Aviation Regulations can lead to enforcement actions by the Civil Aviation Safety Authority (CASA). These actions may include the grounding of the aircraft until compliance is achieved, fines, or other administrative actions deemed necessary to ensure safety. In severe cases, continued non-compliance could potentially result in more stringent penalties, including potential criminal charges if the non-compliance leads to an accident or endangers flight safety.