AD/CESSNA 400/105 Amdt 1 - Main Landing Gear Wheel Bay Wing Rib and Wing Skin

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, are designed to ensure the safety and regulation of civil aviation within Australia. Within these regulations, Part 39 outlines specific airworthiness directives to address identified safety issues in aircraft operations. One such directive, AD/CESSNA 400/105 Amendment 1, was introduced to address reports of cracking in the main landing gear wheel well ribs and wing upper surface skin of specific Cessna 400 series aeroplanes. The objective of this amendment is to mandate inspections and maintenance actions to prevent potential structural failures that could compromise flight safety. The directive applies to certain serial numbers of Cessna Model 401, 402, 411, 414, and 421 aircraft and requires inspections before and after specific operational hours to ensure compliance with safety standards. The amendment mandates that the main landing gear side brace upper support attach bolts be inspected for correct torque, the main landing gear wheel well ribs be cleaned and closely inspected for cracks, and the wing upper surface skin in the overwing baggage locker be visually inspected for cracks, particularly on the inboard side. Compliance with this directive is critical, as failure to adhere to the inspection intervals and corrective actions could lead to serious safety risks. The amendment came into effect on 14 September 1995, following reports of structural cracking in Australian registered aircraft, highlighting the importance of proactive safety measures in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandates stringent safety requirements for certain Cessna 400 series aeroplanes, focusing on the main landing gear wheel bay wing rib and wing skin. This legislation applies to specific models and serial numbers of Cessna aircraft, namely the Model 401 from 401-0001 to 401B0221, Model 402 from 402-0001 to 402B1003, Model 411 from 411-0001 to 411A0300, Model 414 from 414-0001 to 414-0802, and Model 421 from 421-0001 to 41B0970. The regulations require an initial inspection before 100 hours of time in service after 20 July 1995 or before further flight after 14 September 1995, whichever is later, and subsequent re-inspections at intervals not exceeding 100 hours of time in service. Installation of specified service kits or acceptable repairs can terminate the requirement of this directive. This regulation extends across all Commonwealth jurisdictions in Australia, ensuring uniform compliance with safety standards to prevent potential hazards such as the collapse of the main landing gear due to extensive cracking.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 concerning the Civil Aviation Safety Authority Schedule of Airworthiness Directives, include a directive for Cessna 400 Series Aeroplanes (AD/CESSNA 400/105 Amendment 1). This directive mandates the inspection and maintenance of specific components of the aircraft to ensure their continued airworthiness. According to section 10/95, the directive applies to Cessna Model 401 aircraft with serial numbers ranging from 401-0001 to 401B0221, Model 402 from 402-0001 to 402B1003, Model 411 from 411-0001 to 411A0300, Model 414 from 414-0001 to 414-0802, and Model 421 from 421-0001 to 41B0970. The directive requires the inspection of the main landing gear side brace upper support attach bolts for correct torque, a cleaning and close visual inspection of the main landing gear wheel bay wing ribs, and a visual inspection of the wing upper surface skin in the overwing baggage locker for any signs of cracking, particularly focusing on the inboard side of the locker. Compliance with this directive necessitates an initial inspection to be conducted before 100 hours of time in service following 20 July 1995, or before further flight after 14 September 1995, whichever is later. Subsequent inspections must occur at intervals not exceeding 100 hours of time in service. This directive can be terminated by the installation of a Cessna Service Kit SK414-8E or by a repair deemed acceptable by the Authority. The amendment establishing this directive took effect on 14 September 1995. The obligations imposed by this Airworthiness Directive are stringent and clear. Operators of the specified Cessna aircraft models must ensure that the prescribed inspections are performed by qualified personnel within the stipulated timeframes. Failure to comply with these requirements could result in the aircraft being deemed unairworthy. Additionally, any repairs or modifications must be carried out in accordance with specifications approved by the Authority, ensuring that the structural integrity of the aircraft is maintained. Non-compliance with the provisions of this Airworthiness Directive may lead to serious consequences. Under the Civil Aviation Act 1988, failure to adhere to an Airworthiness Directive can be considered a breach of the regulations. Such breaches can result in both civil and criminal penalties. Civil penalties may include fines, while criminal penalties can result in imprisonment, reflecting the serious nature of ensuring the safety of air travel. The exact penalties are determined by the courts, but they can be significant given the potential safety risks associated with non-compliance.