Overview

The Civil Aviation Safety Authority (CASA) issued Airworthiness Directive (AD) SD3-30/47 under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998 (CASR 1998). This AD was enacted to address the issue of potential ignition sources within the fuel tanks of SD3-30 Series aeroplanes, aiming to enhance safety by requiring specific maintenance actions. This directive became effective on 22 September 2004 and is applicable to all model SD3-30 aeroplanes. The directive mandates that operators insert specified amendments in their Aircraft Flight Manual (AFM) and perform detailed inspections and installations as outlined in the directive to ensure compliance with safety standards.

Scope and Application

The Airworthiness Directive (AD) issued under subregulation 39.1 (1) of the Civil Aviation Safety Regulations 1998 applies specifically to all model SD3-30 aeroplanes. This legislation mandates a series of actions to be undertaken to ensure the aircraft meet safety standards, particularly focusing on the bonding and inspection of fuel tanks. The directive requires the incorporation of a specific amendment bulletin into the Aircraft Flight Manual and subsequent performance of tasks detailed in the Shorts Service Bulletin, including checks on fuel tank float switches, inspection of sensor cables and bonding, and the installation of new bonding jumper wires. Compliance with these requirements must be achieved within specified timeframes, with some actions needing to be completed prior to further flights. The directive is issued by a delegate of the Civil Aviation Safety Authority and is applicable throughout the Commonwealth of Australia, aiming to address potential ignition sources inside fuel tanks and thereby enhancing air safety.

Key Provisions

The Airworthiness Directive (AD) outlined in the legislation concerns the SD3-30 series aeroplanes, specifically targeting the bonding and inspection of fuel tanks. Section 1 of the requirement mandates the incorporation of Shorts Flight Manual Advance Amendment Bulletin 1/2004 or a later EASA-approved revision into the Aircraft Flight Manual (AFM). This is a critical step to ensure that the operational manual includes the most recent safety updates and procedures. Additionally, Section 2 outlines specific tasks to be carried out in accordance with the Shorts Service Bulletin (SB) SD 330-28-37. These tasks include an insulation resistance check of the fuel tank float switches, an inspection of the fuel quantity gauging system sensor cables and their supports, an inspection of the bonding of the vent pipes inside the forward fuel tank, and the installation of new bonding jumper wires between the vent pipes and the aircraft structure. Section 3 directs that any defects identified during these tasks must be rectified. Finally, Section 4 makes it mandatory to comply with specific sections of the Aircraft Maintenance Manual, as introduced by the Temporary Revisions TR330-AMM-13 and TR330-AMM-14. The AD imposes several obligations on the parties involved. Firstly, the AFM must be updated with the specified amendments within one month of the AD's effective date. Secondly, the outlined inspections and installations must be performed within six months of the AD's effective date. Defects identified during these inspections must be rectified prior to further flight, ensuring that any potential issues are addressed immediately. Compliance with the specified sections of the Aircraft Maintenance Manual must follow after the inspections are completed. These requirements ensure that the aircraft's fuel tank systems are inspected, maintained, and bonded properly to mitigate the risk of ignition sources inside the fuel tanks. Failure to comply with the AD can result in significant consequences. Although the legislation does not explicitly state the penalties for non-compliance, breaches of airworthiness directives are generally considered serious offences under Australian aviation law. Non-compliance could lead to the grounding of the aircraft, which would prevent any flight operations until the required actions are completed. Additionally, operators might face fines, legal action, or other regulatory sanctions. The severity of the consequences underscores the importance of adhering to the AD to ensure the continued airworthiness and safety of the aircraft.