AD/BELL 206/109 Amdt 3 - Tail Boom Skin

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA), are a comprehensive set of rules designed to ensure the safety and efficiency of civil aviation in Australia. One particular aspect of these regulations is the enforcement of Airworthiness Directives (ADs) to address specific safety concerns. The AD for Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters, specifically AD/BELL 206/109 Amendment 3, was enacted to address severe upper skin cracks in the tail booms of certain models. This amendment, effective from 12 September 1996, introduced stricter inspection requirements and modified intervals to enhance safety, referencing a similar directive issued by the Federal Aviation Administration (FAA). The policy objective is to mitigate the risk of in-flight structural failure by ensuring regular and thorough inspections of the affected helicopter tail booms.

Scope and Application

The Civil Aviation Regulations 1998, as part of the Australian legislative framework, govern various aspects of civil aviation safety, including the issuance of specific Airworthiness Directives. One such directive pertains to the inspection of the tail booms of Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters. This directive applies specifically to models 206L, 206L-I, and 206L-III helicopters equipped with tail booms bearing specific part numbers. The directive mandates that inspections be conducted in accordance with Bell Alert SB 206L-87-47 Rev C, with a specified preference for using a 10X magnifying glass over the 5X specified in the Service Bulletin. Compliance with this directive is essential to address the risk of severe upper skin cracks in the tail booms, which has been identified as a safety concern. The directive outlines different inspection intervals depending on whether the tail booms have been modified; unmodified tailbooms require inspection within 50 hours from the last compliance with the previous issue of this directive and thereafter at intervals not exceeding 50 hours, while modified tailbooms have an inspection interval of 100 hours from the last compliance with the previous issue of this directive and thereafter at intervals not exceeding 100 hours. The directive also specifies that replacement of the tailboom with certain part numbers terminates the requirements of this directive. This directive is effective from 12 September 1996, with earlier amendments having been introduced to address the same safety concern.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate certain airworthiness directives for the Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series helicopters. One such directive is AD/BELL 206/109 Amendment 3, which pertains to the inspection and potential replacement of the tail boom skin (Section 10/96). This directive applies to models 206L, 206L-I, and 206L-III helicopters equipped with specific tail boom parts numbers (P/Nos 206-033-004-3, -11, -103, and -45). Operators must adhere to the inspection requirements outlined in Bell Alert SB 206L-87-47 Revision C, with a preference for using a 10X magnifying glass instead of a 5X when specified. Compliance with this directive involves conducting inspections at specified intervals: for unmodified tail booms, inspections must occur within 50 hours from the last compliance with the previous issue of this Directive and thereafter at intervals not exceeding 50 hours. For modified tail booms, inspections should take place within 100 hours from the last compliance and subsequently at intervals not exceeding 100 hours. The replacement of the tail boom with parts numbers 206-033-044-143 or -173 terminates the need for further compliance with this directive. This Amendment 3 was made effective on 12 September 1996, following findings of severe upper skin cracks in service and building upon previous amendments that had already introduced inspection interval changes. Operators and maintenance personnel are required to meticulously follow these inspection guidelines to ensure the continued airworthiness of the aircraft. Failure to comply with these directives can lead to serious safety concerns, including the risk of in-flight structural failure. These obligations are essential for maintaining the operational safety and integrity of the specified helicopter models. Additionally, the directive references a similar Federal Aviation Administration (FAA) Airworthiness Directive (AD 96-14-10), indicating a coordinated effort between Australian and international aviation safety authorities. Non-compliance with the provisions of this airworthiness directive could result in severe consequences, both civil and criminal. Under Australian law, failure to adhere to such safety regulations can lead to penalties, including fines and potential imprisonment. The specific penalties depend on the severity of the breach and the impact on aviation safety, with maximum penalties for serious breaches potentially reaching substantial financial and custodial sentences. Operators must, therefore, ensure strict adherence to the outlined requirements to avoid any legal repercussions and to maintain the highest standards of aviation safety.