AD/BEECH 400/10 - Cabin Seat Frames

Overview

The Civil Aviation Regulations 1998, specifically Part 39, addresses various aspects of airworthiness directives, including those concerning specific aircraft models. This legislative instrument is part of a broader effort to ensure the safety and airworthiness of aircraft within Australia. Enacted by the Commonwealth of Australia, the Civil Aviation Regulations were established to provide comprehensive guidelines for civil aviation operations, including the maintenance and inspection of aircraft to prevent accidents and ensure public safety. The particular airworthiness directive (AD/BEECH 400/10) concerning the Beechcraft 400 Series Aeroplanes was introduced to address identified issues with the cabin seat frames of certain models. The directive aims to mitigate risks associated with structural failures by requiring regular inspections and repairs of specific components. Compliance with these directives is mandatory to maintain the airworthiness of the affected aircraft, ensuring adherence to safety standards set forth by the Civil Aviation Safety Authority.

Scope and Application

The Civil Aviation Safety Authority (CASA) has issued Airworthiness Directive AD/BEECH 400/10, specifically targeting Beechcraft 400A aircraft with serial numbers RK-1 to RK-40 inclusive and RK-45, provided they are equipped with Tosington Cabin Seat frames having serial numbers prior to 5606 and have not installed Modification Kit 303-307. The directive aims to address issues related to the cracking of cabin seat frames, which have been attributed to gaps between the seat frames and bearing shafts. The requirements set forth in the directive mandate a visual inspection for cracks in the lower seat frame members adjacent to the ends of both bearing shafts, in accordance with Tosington Enterprises Service Bulletin 001, Revision 1. If cracks are detected, they must be repaired following the same bulletin. Additionally, the directive requires the checking and measuring of the gap between the bearing shafts and the lower seat frame members, with any gaps to be rectified using AN960-516 (or equivalent) washers. Compliance with these requirements must be achieved within 200 hours of time in service from 27 April 1995. This directive is applicable under the Civil Aviation Regulations 1998, and its scope and application are strictly limited to the specified Beechcraft 400A aircraft meeting the outlined criteria.

Key Provisions

The Civil Aviation Regulations 1998, particularly Part 39, Section 105, outlines the requirements for the airworthiness of Beechcraft 400 Series aeroplanes, specifically in relation to cabin seat frames. For Beech Model 400A aircraft serial numbers RK-1 to RK-40 inclusive and RK-45, equipped with Tosington Cabin Seat frames having serial numbers prior to 5606 and not installed with Modification Kit 303-307, there are mandatory inspection and repair provisions (AD/BEECH 400/10). These requirements necessitate a visual inspection for cracks in the forward and aft lower seat frame members at the bushings near the ends of both bearing shafts, as detailed in Tosington Enterprises Service Bulletin 001, Revision 1. If any cracks are detected, they must be repaired following the same service bulletin. Additionally, operators are required to check and measure the gap between the bearing shafts and the forward and aft lower seat frame members, rectifying any gaps using AN960-516 (or equivalent) washers, again in accordance with Tosington Enterprises Service Bulletin 001, Revision 1. Compliance with these requirements must be achieved within 200 hours of the aircraft being in service from 27 April 1995. Operators of the specified Beechcraft 400 Series aeroplanes must ensure that these inspections and repairs are conducted meticulously. This includes adherence to the detailed procedures outlined in Tosington Enterprises Service Bulletin 001, Revision 1, to maintain the structural integrity of the cabin seat frames. Operators must be vigilant in detecting and addressing any signs of wear or damage, such as cracks and gaps, to ensure that the aircraft remains airworthy and compliant with safety regulations. This involves regular checks and the appropriate use of shims to rectify any identified gaps, ensuring that the seat frames function correctly and safely. Failure to comply with the airworthiness directives specified in the Civil Aviation Regulations can lead to severe consequences. If operators do not adhere to the requirements set forth in AD/BEECH 400/10, they may face regulatory action, including potential enforcement measures by the Civil Aviation Safety Authority (CASA). Non-compliance with airworthiness directives is not only a regulatory breach but also poses significant safety risks. The penalties for such breaches can include fines and legal action, as well as potential grounding of the aircraft until the necessary repairs and inspections are completed. The specific penalties and enforcement actions are determined by the severity of the breach and the risk posed to aviation safety.