AD/TB10/29 - Vertical Stabiliser Forward Junction Doubler

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Act 1988, were enacted to ensure the safe operation of civil aircraft within Australian airspace. Part 39 - 105 of these regulations specifically addresses Airworthiness Directives, which are statutory rules issued by CASA to address safety issues or discrepancies in aircraft. The particular Airworthiness Directive AD/TB10/29, effective from 18 August 1999, targets Aerospatiale (Socata) TB9 and TB10 (Tobago) series aeroplanes, addressing the problem identified where the vertical stabiliser forward junction doubler was missing, which could potentially compromise the structural integrity and safety of the aircraft during flight. The policy objective of this directive is to mandate visual inspections and necessary rectifications to ensure compliance with safety standards, thus mitigating any risk associated with the identified issue.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, applies to all Aerospatiale (Socata) TB9 and TB10 (Tobago) series aeroplanes. This legislation mandates that operators of these aircraft must perform a visual inspection to ensure there is no gap between the vertical stabiliser leading edge and the fuselage, as well as to verify the presence of the vertical stabiliser forward junction doubler. If the inspection reveals any discrepancies, operators must contact the manufacturer for corrective actions before further flight. The directive also specifies that compliance must be recorded in the aircraft’s Maintenance Release and a copy of the Airworthiness Directive must be kept on board. This regulation is effective from 18 August 1999 and is subject to enforcement within a set timeframe, either 50 hours of time in service or at the next periodic inspection, whichever comes first. The legislation applies on a Commonwealth level and extends to all relevant aircraft within Australia, with no specified exclusions or exemptions in this directive.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes the Civil Aviation Safety Authority's Schedule of Airworthiness Directives, which mandates specific maintenance actions for certain aircraft. AD/TB10/29 pertains to the Aerospatiale (Socata) TB9 and TB10 (Tobago) Series Aeroplanes, focusing on the vertical stabiliser forward junction doubler. According to Section 105, this directive applies to all TB9 and TB10 aircraft (Section 1). The main requirements are twofold. Firstly, a visual inspection must be conducted to ensure there is no gap between the vertical stabiliser leading edge and the fuselage (Section 1a). If no gap is found, no further action is necessary. However, if a gap is identified, the operator must contact the manufacturer for rectification before further flight (Section 1b). Secondly, it is mandatory to check through the air cooling oval hole on the leading edge of the vertical stabiliser for the presence of the vertical stabiliser forward junction doubler (Section 2a). If the doubler is present, the aircraft can return to service. If it is absent, the operator must contact the manufacturer for rectification before further flight (Section 2b). The obligations imposed by this directive are clear and require adherence to specific inspection protocols. Operators must conduct a pre-flight inspection to verify the integrity of the vertical stabiliser leading edge and the presence of the forward junction doubler (Section 1). This inspection must be performed at each pre-flight check following the directive's effective date of 18 August 1999, until the second requirement is met (Section 2). Additionally, an inspection must be carried out within 50 hours of time in service after the directive's effective date or at the next periodic inspection, whichever comes first (Section 3). The findings of the inspection must be documented on the Maintenance Release, and a copy of the Airworthiness Directive must be kept in the aircraft (Section 4). If the Pilot in Command performs the visual inspection, certification must be made by entering AD/TB10/29 against the daily inspection certification on the Maintenance Release (Section 5). Failure to comply with the requirements of AD/TB10/29 can lead to significant consequences. The regulations do not explicitly state specific offences, penalties, or consequences for non-compliance. However, non-compliance with airworthiness directives can generally result in enforcement actions by the Civil Aviation Safety Authority, including fines, suspension or revocation of the aircraft's Certificate of Airworthiness, and potential criminal charges if the non-compliance leads to an aviation incident or accident. The exact penalties would depend on the severity of the non-compliance and the resulting impact on aviation safety.