AD/SF340/23 - Nacelle Cowling Door

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, incorporates Airworthiness Directives (AD) issued by the Civil Aviation Safety Authority (CASA), addressing the safety and airworthiness of aircraft operating within Australia. One such AD, AD/SF340/23, pertains to the Saab SF340 series aeroplanes, focusing on the nacelle cowling door. Enacted in 1991, this legislation was introduced to address a specific safety issue identified in certain models of the Saab SF340, where the nacelle forward cowling door latches were prone to abnormal abrasion, potentially leading to unintentional unlocking during flight. The policy objective behind AD/SF340/23 is to ensure the safety of these aircraft by mandating compliance with the technical requirements outlined in Swedish LFV AD 1-042, thus preventing potential in-flight hazards. Compliance with this directive is crucial for maintaining the airworthiness standards of Saab SF340A and SF340B models within the specified serial numbers.

Scope and Application

The Civil Aviation Regulations 1998, under Part 39 - 105, specifically targets Saab SF340 series aeroplanes, more precisely the Model 340A and 340B, with serial numbers ranging from Saab 340A-004 through -159 and Saab 340B-160 through -200. This legislation mandates adherence to the technical requirements outlined in the Swedish LFV AD 1-042 concerning the nacelle cowling door. The directive applies to these aircraft to ensure safety by addressing issues with the latch triggers on the nacelle forward cowling doors, which, if improperly trimmed, can cause abnormal abrasion, potentially leading to the latches unlocking during flight and the cowling door opening mid-flight. Compliance with the directive is critical and must be achieved in accordance with the specified requirements, with the compliance date revised to 21 March 1991. This regulation extends across the Commonwealth of Australia, impacting aviation entities and operators within its jurisdiction.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, under the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, includes an important directive for Saab SF340 Series Aeroplanes (section 39-105). The directive, AD/SF340/23, pertains to the nacelle cowling door of Model 340A and 340B aircraft with specified serial numbers. The directive mandates that these aircraft comply with the technical requirements outlined in the Swedish LFV AD 1-042, referencing SAAB-SCANIA AB SB SAAB 340-71-35. Compliance is to be achieved as detailed in the Requirement Document, which has a revised effective date of 21 March 1991. The directive places obligations on the owners and operators of the affected Saab SF340 aircraft. They must ensure that the nacelle cowling door latch triggers on their aircraft are not trimmed in a manner that could cause abnormal abrasion. This includes adhering to the technical specifications and procedures provided by Swedish LFV AD 1-042. The directive underscores the importance of maintaining the integrity of the latch mechanism to prevent any accidental opening of the cowling doors during flight, which could pose significant safety risks. Failure to comply with the requirements of AD/SF340/23 can lead to serious consequences. The Civil Aviation Regulations 1998 impose penalties for non-compliance with airworthiness directives. Specifically, breaches of these regulations may result in enforcement actions by CASA, which can include fines and other administrative penalties. While the exact penalties are not detailed in this particular directive, they are generally aligned with the severity of the non-compliance and the potential risk to aviation safety. It is crucial for aircraft owners and operators to adhere to these regulations to ensure the safety and airworthiness of their aircraft.