AD/BELL 206/103 - Tension/Torsion Strap Fitting

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, address various aspects of civil aviation safety, including the establishment of airworthiness directives to ensure the safe operation of aircraft. One such directive, AD/BELL 206/103, was introduced to address a specific safety issue concerning Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters. The directive aims to prevent a potential malfunction in the tension/torsion strap fitting (P/No. 206-011-150-101) which, if improperly refitted, could lead to a failure to achieve full collective pitch in the event of an engine failure. The policy objective of this directive is to ensure that inspections are conducted to maintain the correct alignment of the strap fitting, thereby enhancing the safety of the aircraft's operation.

Scope and Application

The Civil Aviation Regulations 1998, as amended, apply to all Bell 206B III Series Helicopters fitted with a specific tension/torsion strap sleeve fitting identified by the part number 206-011-150-101. The regulation mandates that these aircraft must undergo an inspection of the strap fitting to ensure it is correctly aligned with the static stop (P/N. 206-011-121-103) after the tension/torsion strap assembly has been disassembled since new. It is critical that the inspection is carried out within 100 hours of time in service after 31 August 1986 and at any point thereafter whenever the tension/torsion strap assembly is disassembled, until the fitting P/No. 206-011-150-101 is replaced with P/No. 206-011-150-105. This regulation aims to prevent a potential increase in twist with pitch increase, which could lead to an inability to achieve full collective pitch in the event of an engine failure if the strap fitting is refitted incorrectly. The strap fitting P/No. 206-011-150-101, which is fitted by the manufacturer, is not available as a replacement; instead, the P/No. 206-011-150-105 fitting must be used.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 (Civil Aviation Safety Authority Schedule of Airworthiness Directives), addresses safety requirements for Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters, with a focus on AD/BELL 206/103 (section 8/86). This directive pertains to the tension/torsion strap fitting P/No. 206-011-150-101, which is critical for ensuring the proper functioning of the helicopter's blade grip mechanism. For aircraft that have had their tension/torsion strap assembly disassembled since new, the regulation mandates that the strap fitting be inspected to ensure it is aligned correctly with the static stop (P/N 206-011- 121-103). The fitting must have three flats adjacent to each other, with the centre flat being the correct one for mating with the static stop. If the wrong flat is aligned, it can lead to increased twist with pitch increase instead of the desired effect, potentially causing significant issues if the aircraft experiences an engine failure. Compliance with this directive is straightforward but essential. The inspection must be conducted within 100 hours of time in service after 31 August 1986, and then whenever the tension/torsion strap assembly is disassembled, until the P/No. 206-011-150-101 fitting is replaced with the P/No. 206-011-150-105 fitting. This ongoing requirement ensures that the fitting is correctly aligned each time it is worked on, maintaining the integrity and safety of the helicopter's operation. The fitting is originally fitted by the manufacturer and, once disassembled, must be refitted correctly to prevent potential safety hazards. Failure to comply with these regulations can have serious consequences. The incorrect refitting of the strap fitting P/No. 206-011-150-101 can lead to an inability to achieve full collective pitch in the event of an engine failure, which could compromise the safety of the flight. Although the original fitting is not available as a replacement, the P/No. 206-011-150-105 fitting is provided, and its use resolves the identified issue. Non-compliance with these directives may result in civil or criminal penalties, which could include fines or other enforcement actions as stipulated by the Civil Aviation Safety Authority. The penalties for non-compliance with these airworthiness directives are significant and are designed to enforce adherence to safety standards. Civil penalties can include fines up to the statutory maximum, which varies depending on the severity and circumstances of the breach. Additionally, criminal penalties may apply, which could result in imprisonment for individuals found guilty of violating these safety requirements. The overarching goal of these provisions is to ensure the continued airworthiness and safety of the Bell 206B III Series Helicopters, protecting both the crew and passengers from potential hazards.