AD/TB20/19 - Oil Cooler Inlet and Outlet Elbows

Overview

The Civil Aviation Regulations 1998 (Cth), specifically in Part 39 - 105, contain the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, which include AD/TB20/19 concerning Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes. Enacted by the Commonwealth of Australia, this legislation aims to address the safety issue of oil cooler inlet and outlet elbow leakage in these aircraft, which has caused total engine oil loss. The regulation was introduced to ensure compliance with Socata Service Bulletin NR 50-1, referencing DGAC AD 90-143(A), and requires all model TB20 and TB21 aircraft to undertake the necessary action before 31 January 1991. The policy objective is to enhance aviation safety by mandating corrective measures to prevent engine failure due to oil loss, thereby protecting both aircraft and passengers.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, which pertains to the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, apply to all model TB20 and TB21 aircraft within the Commonwealth of Australia. This legislative instrument mandates compliance with Socata Service Bulletin NR 50-1 concerning the oil cooler inlet and outlet elbows, addressing potential leakage that could result in total engine oil loss. The directive extends to all such aircraft registered within Australia, ensuring that maintenance and modifications are conducted to meet the specified safety standards. The requirement for compliance is set prior to 31 January 1991, as referenced in DGAC AD 90-14-3(A). The regulation's scope is clear and targeted, focusing exclusively on the identified aircraft models and associated safety concerns, with no stated exclusions or exemptions in the provided text. The application of this directive is comprehensive and jurisdictional, ensuring that all affected aircraft within the Australian airspace adhere to the prescribed safety measures.

Key Provisions

The key provisions of the Civil Aviation Regulations 1998, particularly Part 39-105, focus on ensuring the airworthiness of specific aircraft models, in this case, the Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes. Under Section AD/TB20/19, it mandates that all model TB20 and TB21 aircraft must comply with the requirements outlined in Socata Service Bulletin NR 50-1. This directive is aimed at addressing issues related to leakage from the oil cooler inlet and outlet elbows, which have previously resulted in total engine oil loss. The note referencing DGAC AD 90-143(A) provides additional context and regulatory alignment with other aviation safety authorities. The obligations imposed by these regulations are clear and precise. Operators and owners of TB20 and TB21 aircraft must ensure that the modifications or actions specified in Socata Service Bulletin NR 50-1 are completed. This typically involves inspecting, repairing, or replacing the oil cooler inlet and outlet elbows to prevent any potential leakage. The compliance deadline is set before 31 January 1991, which underscores the urgency and importance of adhering to these directives to maintain the safety and airworthiness of the aircraft. Failure to comply with these provisions can result in significant legal and safety repercussions. Section 91.7A of the Civil Aviation Act 1988 outlines that non-compliance with airworthiness directives can lead to civil penalties. The maximum penalty for contravening these regulations can be severe, including substantial fines and, in some cases, imprisonment. The seriousness of these consequences highlights the importance of adhering to the mandated actions and timeframes to ensure the safety of the aircraft and its passengers. Additionally, the potential for criminal liability is a significant deterrent against non-compliance. Under Section 91.7B of the Civil Aviation Act 1988, individuals or corporations found guilty of wilfully disregarding these airworthiness directives could face criminal charges. This could result in fines up to $210,000 for individuals and $1,050,000 for corporations, along with potential imprisonment terms. These stringent penalties underscore the critical importance of compliance and the high stakes involved in ensuring the safety and integrity of civil aviation operations.