AD/SF340/31 - Stabilizer De-Icing

Overview

The Civil Aviation Regulations 1998, specifically within Part 39, were enacted to regulate various aspects of aviation safety and operations within Australia, ensuring compliance with international standards. One such regulation, AD/SF340/31, addresses the stabilising de-icing issues in Saab SF340 series aeroplanes. This regulation was introduced to address the problem of freezing of the control valve and pressure switch located in the dorsal fin of the aircraft, which could lead to the continuous inflation or deflation of de-ice boots, thereby compromising the aircraft's safety and airworthiness. The regulation is applicable to Model 340B aircraft with serial numbers ranging from 240 to 299 inclusive. The policy objective is to ensure compliance with the technical requirements outlined by the Swedish Civil Aviation Administration (LFV) as specified in AD No 1-051, thereby maintaining the high standards of aviation safety in Australia.

Scope and Application

The Civil Aviation Safety Authority (CASA) administers the Civil Aviation Regulations 1998, which includes specific directives on the airworthiness of aircraft, such as the Stabilizer De-Icing directive for the Saab SF340 Series Aeroplanes, outlined in Schedule 105 of the regulations. This directive applies specifically to Saab 340B model aeroplanes with serial numbers ranging from 240 to 299 inclusive. The requirement mandates compliance with the technical specifications set forth by the Swedish Air Force (LFV) AD No 1-051, with reference to Saab SB Saab 340-30-039. Compliance with this directive is a prerequisite for the issuance of a Certificate of Airworthiness, ensuring that the aircraft's stabilizer de-icing system is functioning correctly to prevent issues such as freezing of the control valve and the pressure switch in the dorsal fin, which could lead to de-ice boots remaining continuously inflated or deflated. The directive encompasses a narrow scope, focusing solely on the specified model and serial number range, thereby ensuring targeted safety measures within the specified fleet.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes a Schedule of Airworthiness Directives that pertain to various aircraft models, including the SAAB SF340 Series Aeroplanes. Under this legislation, AD/SF340/31 is concerned with the de-icing systems of the Stabilizer for Model 340B aeroplanes with serial numbers ranging from 240 to 299. This directive mandates that these aircraft must comply with the Technical Requirements outlined in LFV (Sweden) AD No 1-051. This is further referenced in SAAB SB SAAB 340-30-039. The key requirement is that any necessary action must be taken to ensure the de-icing system is functional before a Certificate of Airworthiness is issued. This directive ensures that the freezing of the control valve and pressure switch located in the dorsal fin is prevented, which could otherwise lead to the de-ice boots remaining continuously inflated or deflated. The obligations imposed by AD/SF340/31 are quite specific. Aircraft operators and owners must ensure that their SAAB SF340 Series Aeroplanes comply with the airworthiness directive before any flight operations can commence. This involves taking necessary actions to address any issues with the stabilizer de-icing system to prevent the freezing of the control valve and pressure switch. The directive necessitates adherence to the Technical Requirements of LFV (Sweden) AD No 1-051, ensuring that the de-icing system functions correctly and the aircraft is safe for operation. Compliance with this directive is a prerequisite for the issuance of a Certificate of Airworthiness, which is mandatory for legal flight operations. Failure to comply with AD/SF340/31 can result in significant consequences. If an aircraft operator fails to address the stabilizer de-icing issues as outlined in the directive, they risk non-compliance with the Civil Aviation Regulations 1998. This non-compliance can lead to the refusal to issue or the revocation of a Certificate of Airworthiness, which is a critical legal requirement for operating an aircraft. In addition, such non-compliance may result in enforcement actions by the Civil Aviation Safety Authority, which can include fines, legal proceedings, and potentially grounding the affected aircraft until the necessary corrective actions are taken. The seriousness of these consequences underscores the importance of adhering to the airworthiness directive to ensure the safety and legality of flight operations.