AD/BELL 412/34 - Swashplate Support

Overview

The Civil Aviation Regulations 1998, amended through the Legislative instrument F2006B04668, introduce specific airworthiness directives aimed at enhancing the safety of the Bell Helicopter Textron 412 Series helicopters. This legislation was enacted to address the identified issue of fatigue failure in the swashplate support of certain Bell model 412 series helicopters, which posed a significant risk to aviation safety. The policy objective is to ensure that all specified helicopters undergo necessary inspections and component replacements to mitigate the risk of in-flight failures. The regulations mandate that operators of affected Bell 412 series helicopters must conduct a detailed visual inspection of the swashplate support and, if necessary, replace it with a new component within specified time frames to maintain airworthiness and ensure compliance with safety standards. This legislative instrument, issued by the Civil Aviation Safety Authority, targets the specific problem of swashplate support fatigue, which was highlighted by a reported failure. By requiring inspections and replacements of the swashplate support, the Civil Aviation Regulations 1998 aim to prevent potential catastrophic failures that could endanger flight safety. The directive applies to helicopters with specific serial numbers and components, enforcing strict compliance timelines to ensure that these critical safety measures are adhered to across the fleet.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, mandate the application of the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, AD/BELL 412/34, which pertains to the swashplate support of Bell Helicopter Textron 412 series helicopters. This legislation applies to all Bell model 412 series helicopters with serial numbers ranging from 33001 to 33159 and from 34001 to 34024 that are equipped with either the swashplate support parts numbered 412-010-409-105 or 412-010-443-101. The directive necessitates a detailed visual inspection of the swashplate support, to be performed in accordance with Bell Alert Service Bulletin (ASB) 412-93-71, Accomplishment Instructions Part I, and mandates the replacement of the installed swashplate support with a new part numbered 412-010-453-105, in line with Bell ASB 412-93-71, Accomplishment Instructions Part II. Compliance with this directive requires that an inspection be conducted before further flight after 22 March 1995, and subsequent inspections must occur at each 25-hour interval until the replacement is performed. The replacement must be completed within 400 hours of time in service after 27 April 1995, but no later than 31 December 1995.

Key Provisions

The Civil Aviation Regulations 1998, specifically in Part 39, Section 105, issue an Airworthiness Directive (AD) concerning Bell Helicopter Textron 412 Series helicopters. This directive, AD/BELL 412/34, pertains to the swashplate support of certain model 412 series helicopters. According to the legislation, the directive applies to all Bell model 412 series helicopters with serial numbers (S/N) ranging from 33001 to 33159 and S/N 34001 to 34024, provided they are fitted with specific swashplate support parts (P/N 412-010-409-105 or 412-010-443-101). The primary requirement is a detailed visual inspection of the swashplate support, which must be conducted in accordance with Bell Alert Service Bulletin (ASB) 412-93-71, Accomplishment Instructions Part I. Furthermore, the installed swashplate support must be removed and replaced with a new part (P/N 412-010-453-105), following Bell ASB 412-93-71, Accomplishment Instructions Part II. Compliance with this directive mandates that the detailed visual inspection of the swashplate support must be performed before any further flight after 22 March 1995. Additionally, the inspection must be repeated at each 25-hour interval until the swashplate support is replaced as per the directive. The removal and replacement of the swashplate support must be completed within 400 hours of time in service after 27 April 1995, but no later than 31 December 1995. This timeline ensures that the necessary safety measures are implemented to prevent potential issues related to the swashplate support. The Civil Aviation Regulations 1998 impose specific obligations on the parties governed by this Airworthiness Directive. Operators of Bell model 412 series helicopters within the specified serial number range must ensure that the required inspections and replacements of the swashplate support are carried out according to the detailed instructions provided. This includes adhering to the Bell Alert Service Bulletin and Accomplishment Instructions for both the inspection and replacement processes. Failure to comply with these obligations may result in serious safety implications and potential grounding of the aircraft until the necessary actions are taken. The legislation also outlines the consequences for non-compliance with the AD/BELL 412/34 directive. Although the specific penalties and legal consequences are not detailed in the provided text, non-compliance with Civil Aviation Regulations generally may result in significant civil or criminal penalties, including fines and potential imprisonment. The severity of these penalties is determined by the nature and extent of the non-compliance, as well as any resulting harm or risk to aviation safety. Operators must take these obligations seriously to avoid any legal repercussions and to ensure the continued airworthiness and safety of their aircraft.