Overview

The Civil Aviation Regulations 1998, a foundational piece of Australian legislation, was enacted to regulate civil aviation safety and ensure the airworthiness of aircraft. This legislation, overseen by the Civil Aviation Safety Authority (CASA), aims to maintain high safety standards in the aviation industry by issuing directives that address specific safety concerns. One such directive, AD/SAAB/5, was issued on 7 July 2002, targeting the SAAB “Safir” Series Aeroplanes to address an identified safety issue with certain bellcranks in the flight control system. These bellcranks, manufactured from a material prone to deterioration and cracking, required inspection using a dye penetrant method in accordance with SAAB Service Bulletin No. 91.4.002. The directive was necessary to mitigate the risk of unsafe conditions that could potentially compromise flight safety. CASA mandated that these inspections be completed before 31 August 2002, prohibiting aerobatic manoeuvres and advising against abrupt application of flight controls until the required inspections were accomplished.

Scope and Application

The Airworthiness Directive (AD) issued under the Civil Aviation Regulations 1998 (CAR 1998) applies specifically to the Saab "Safir" series aeroplanes, namely the models Safir 91B, 91B2, 91C, and 91D, with serial numbers ranging from 91-201 to 91-474. This directive mandates that certain bellcranks in the flight control system of these aircraft be inspected using the dye penetrant method, in accordance with Saab Service Bulletin No. 91.4.002. The directive aims to address a safety concern identified with bellcranks manufactured from "Hydronaulium," which deteriorates over time and is prone to cracking. Until the specified inspection and any necessary corrective actions are completed, the directive prohibits all aerobatic manoeuvres and advises against abrupt application of the flight controls. Compliance with this directive must be achieved before 31 August 2002, with the directive becoming effective on 11 July 2002. This AD is issued by a delegate of the Civil Aviation Safety Authority, as per subregulation 39.1(1) of the CAR 1998, and is applicable throughout the Commonwealth of Australia.

Key Provisions

The key sections of this Airworthiness Directive (AD) revolve around the requirements, applicability, and compliance for the Saab “Safir” series aeroplanes. Specifically, Section 39.105 (1) of the Civil Aviation Regulations 1998 mandates that the delegate of the Civil Aviation Safety Authority (CASA) issues an AD to address identified safety issues. In this case, the AD/SAAB/5 targets the flight control system bellcranks in the Saab “Safir” 91B, 91B2, 91C, and 91D models with serial numbers between 91-201 and 91-474. The requirement section mandates that these aircraft undergo an inspection of certain bellcranks using the dye penetrant method as outlined in Saab Service Bulletin No. 91.4.002. Until this inspection is completed, the AD prohibits aerobatic manoeuvres and advises against abrupt application of flight controls. The compliance section stipulates that the required action must be completed before 31 August 2002, unless it has already been accomplished. The obligations imposed by this AD on the parties it governs are stringent. Aircraft operators must ensure that the specified inspection is carried out on the relevant Saab “Safir” models within the stipulated timeframe. This involves following the precise inspection procedure detailed in Saab Service Bulletin No. 91.4.002, which includes the use of the dye penetrant method to detect any cracks in the bellcranks. Additionally, operators must comply with the restrictions on aerobatic manoeuvres and abrupt control applications until the inspection is completed. This directive aims to maintain the airworthiness of the affected aircraft by addressing potential safety hazards associated with the identified manufacturing defect. Failure to comply with this Airworthiness Directive can lead to significant consequences. While the regulations do not explicitly state civil or criminal penalties, non-compliance can result in the grounding of the aircraft, which can severely impact operational activities and potentially lead to financial losses. Furthermore, operating an aircraft in violation of an AD can be considered an offence under the Civil Aviation Act 1988, potentially resulting in fines or other legal repercussions. The safety-critical nature of aviation necessitates strict adherence to such directives to prevent accidents and ensure the safety of all passengers and crew.