Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, includes an Airworthiness Directive issued by the Civil Aviation Safety Authority (CASA) to address safety concerns related to certain models of Bell UH-1 Series Helicopters. Enacted to ensure the safe operation of aircraft, this regulation was introduced to prevent the failure of tail rotor hubs on UH1L, TH1L, and UH1H models by mandating the removal of specific parts before further flight. This directive is intended to rectify an unsafe condition that could potentially compromise the integrity and safety of the aircraft. The directive was issued by a delegate of CASA under subregulation 39.1 (1) of the Civil Aviation Regulations 1998, and the policy objective is clearly stated as ensuring the safety and airworthiness of the specified helicopter models.

Scope and Application

The Airworthiness Directive (AD) under the Civil Aviation Regulations 1998 applies specifically to the Bell UH-1 Series helicopters, namely the UH1L, TH1L, and UH1H models. This AD is issued by the Civil Aviation Safety Authority (CASA) and mandates the removal from service of tail rotor hubs with part number 204-011-801-121, serial numbers ranging from IT0001 to IT0010. The directive aims to rectify an unsafe condition identified with these specific tail rotor hubs, necessitating their removal before any further flight can occur following the effective date of the directive. This requirement applies to all relevant aircraft within the Commonwealth of Australia. While the AD itself does not explicitly state any exclusions or exemptions, its applicability is restricted to the specified models and serial numbers of tail rotor hubs. The directive's enforcement ensures the continued airworthiness of the affected aircraft, thereby enhancing aviation safety standards.

Key Provisions

The main operative sections of the Airworthiness Directive (AD) AD/UH-1/8 pertain to the applicability and requirement of the directive. Specifically, section (a) of the applicability clause applies to the UH1L, TH1L, and UH1H models of the Bell UH-1 series helicopters. The requirement section mandates the removal from service of the tail rotor hub with part number 204-011-801-121, specifically those with serial numbers IT0001 through IT0010. This action is necessary before further flight after the effective date of the directive, which is 10 August 2000. The Airworthiness Directive imposes certain obligations on the parties and entities it governs. Primarily, it requires that the specified tail rotor hubs be removed from service immediately upon the directive's effective date. This involves identifying the affected hubs, ensuring they are grounded, and preventing their use in any further flights. Additionally, the directive references FAA AD 89-20-12, indicating that the requirements align with those set by the Federal Aviation Administration in the United States. Failure to comply with the provisions of this Airworthiness Directive may result in significant consequences. Although specific penalties are not detailed within the text, non-compliance could lead to regulatory action by the Civil Aviation Safety Authority (CASA). This could include fines, legal action, or other enforcement measures. The directive's intent is to prevent unsafe conditions, and any failure to adhere to its requirements could potentially lead to serious safety risks, both for the aircraft and those onboard.