AD/SAAB/3 Amdt 1 - Main Spar Carry Through (U Profile) Corrosion

Overview

The Civil Aviation Regulations 1998, specifically within Part 39 - 105, includes the Civil Aviation Safety Authority Schedule of Airworthiness Directives, which addresses safety issues in aircraft maintenance and operations. One such directive, AD/SAAB/3Amdt 1, pertains to the Saab Safir Series Aeroplanes and specifically targets corrosion in the main spar carry-through (U profile). Enacted by the Commonwealth of Australia, this directive was introduced to address the problem of corrosion damage in the lower U-profile of the fuselage main spar, which is a highly loaded member and crucial to the structural integrity of the aircraft. The policy objective behind this directive is to ensure that such critical components are regularly inspected and maintained to prevent degradation of the structural capability, thereby enhancing aviation safety. The directive applies to Safir models 91A, 91B, 91B2, 91C, and 91D, requiring compliance with the action specified in SAAB 91 Safir SB 91.1.006 Rev1. This amendment was effective from 7 November 1996, necessitating inspections at intervals not exceeding 12 months, with the first compliance required at the next inspection due or before 30 March 1997. The directive references Swedish AD No. 1-100 and revises the requirement document to ensure ongoing safety and structural integrity of the affected aircraft models.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate the application of the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives (AD) to ensure the airworthiness of Saab Safir series aeroplanes. This particular amendment, AD/SAAB/3, targets Saab Safir models 91A, 91B, 91B2, 91C, and 91D, focusing on the corrosion of the main spar carry-through (U-profile). This directive applies to aircraft operators and maintenance personnel who must adhere to the specified requirements to ensure ongoing airworthiness. The directive has a national reach, applying across the Commonwealth of Australia, and extends to any aircraft of the specified models registered and operating within its jurisdiction. The directive mandates compliance with the Saab 91 Safir Service Bulletin SB 91.1.006 Rev 1 and Swedish AD No. 1-100. Compliance must be achieved at the next scheduled inspection or before 30 March 1997, whichever comes first, and subsequently at intervals not exceeding 12 months. This legislative instrument underscores the critical importance of regular inspections and maintenance to prevent corrosion-related structural degradation in these aircraft models.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, outlines the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives, which includes AD/SAAB/3 (Amendment 1) concerning the Saab Safir Series Aeroplanes. This particular directive addresses corrosion in the main spar carry-through (U profile) of Safir models 91A, 91B, 91B2, 91C, and 91D (section 1). The directive mandates that corrective action must be taken in accordance with the SAAB 91 Safir Service Bulletin 91.1.006, Revision 1, and references Swedish AD No. 1-100 (section 2). The directive stipulates that compliance must be achieved at the next inspection due, in line with the previous version of this directive, or before 30 March 1997, whichever comes first, and subsequently at intervals not exceeding 12 months (section 3). It is important to note that the amendment became effective from 7 November 1996 (section 4). The directive addresses corrosion damage that has been reported in the lower U-profile of the fuselage main spar, which is a highly loaded member, and any corrosion damage could potentially degrade the structural integrity of the aircraft (section 5). The obligations under this directive are clear: aircraft operators must ensure that the required inspections and repairs are carried out as specified by the referenced documents. This includes identifying and mitigating any corrosion issues in the U-profile of the main spar. Failure to comply with these requirements can result in the aircraft being deemed unairworthy, leading to potential grounding of the aircraft until the necessary repairs are performed (section 6). Under the Civil Aviation Act 1988, any person who contravenes a regulation or an airworthiness directive may be subject to enforcement action. This could include civil penalties, such as fines, as well as potential criminal charges in cases of serious non-compliance. The exact penalties can vary depending on the severity of the breach and the specific circumstances, but they can be significant, reflecting the importance of adhering to airworthiness directives for ensuring public safety in aviation (section 7).