AD/SF340/63 - Airfoil De-Icing - Introduction of New Improved Check Valve

Overview

The Civil Aviation Regulations 1998, as amended, establish a comprehensive regulatory framework for ensuring the safety of civil aviation in Australia. Part 39, in particular, includes the Airworthiness Directives which mandate specific safety measures to address identified issues. One such directive, AD/SF340/63, was enacted to address a critical safety issue identified with the Saab SF340 series aeroplanes. This directive, effective from 29 January 1998, was introduced by the Civil Aviation Safety Authority (CASA) following operational tests revealing that the installed check valves on Saab 340B series aircraft had failed, potentially leading to the loss of airfoil de-ice system operation during single engine operation. The policy objective of AD/SF340/63 is to ensure the continued airworthiness of affected aircraft by mandating the installation of improved check valves as per SAAB Service Bulletin 340-30-080, thereby mitigating the risk associated with the previously identified design defect.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to airworthiness directives issued by the Civil Aviation Safety Authority (CASA) for maintaining the safety standards of aircraft in Australian airspace. This legislative instrument applies to SAAB 340B series aeroplanes, specifically those with serial numbers ranging from 240 to 430, inclusive, that are equipped with Check Valves BF Goodrich P/N 3D3511. The directive mandates the installation of improved check valves as per SAAB Service Bulletin 340-30-080, and references SAD N0. 1-120 for additional context. Compliance with this directive is required within six months from the effective date, which is 29 January 1998. This directive cancels and replaces the previous AD/SF340/56, addressing a defect identified in the previously mandated design improvement. The regulations are applicable nationally, overseen by CASA, and failure to comply with these directives can result in penalties under the Civil Aviation Act 1988.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, includes a schedule of airworthiness directives which addresses the safety of certain aircraft models. In this case, AD/SF340/63 pertains to the SAAB SF340 Series aeroplanes and mandates the introduction of a new improved check valve for the airfoil de-icing system. This directive applies to SAAB 340B series aircraft with serial numbers ranging from 240 to 430 (inclusive) that have installed Check Valves BF Goodrich P/N 3D3511. The requirement is to install improved check valves in accordance with SAAB Service Bulletin 340-30-080, with reference to Service Advisory Document (SAD) No. 1-120. Compliance with this directive must be achieved within six months of its effective date, which is 29 January 1998. The obligations imposed by this directive are clear and specific. Owners and operators of the affected SAAB 340B series aircraft must ensure that the required modifications to the airfoil de-icing system are completed by installing the improved check valves as outlined in SAAB Service Bulletin 340-30-080. This involves a detailed process of replacing or modifying the existing check valves to the specifications provided, which are aimed at preventing failures that could compromise the safety of the aircraft during operation, particularly in single-engine scenarios. Failure to comply with these requirements within the stipulated timeframe may result in the aircraft being deemed non-airworthy, which could lead to grounding and potential legal consequences. Non-compliance with the provisions of AD/SF340/63 could result in serious civil and criminal consequences. The Civil Aviation Safety Authority (CASA) has the authority to enforce these regulations, and failure to adhere to the airworthiness directive may be considered an offence under the Civil Aviation Act 1988. This could result in substantial penalties, including fines and potential imprisonment for those responsible for the aircraft's operation. The exact penalties for non-compliance are not specified within the directive itself, but they can be severe, reflecting the critical nature of maintaining airworthiness standards in aviation. It is imperative for all parties involved to take this directive seriously and ensure full compliance to avoid these potential repercussions.