AD/HILLER 12/33 - Tail Rotor Blade P/N 55073 - Inspection

Overview

The Civil Aviation Regulations 1998, as amended, contain detailed provisions to ensure the safety and airworthiness of aircraft operating in Australian airspace. Specifically, Part 39 - 105, under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, addresses the periodic inspection requirements for the Hiller UH-12 Series Helicopters. Enacted by the Commonwealth of Australia, this regulation aims to mitigate risks associated with the potential obstruction of vent holes in the tail rotor blades, which could lead to operational failures or safety hazards. The directive mandates regular inspections to be performed at each daily or overnight inspection, with compliance potentially certified by the pilot in command. This legislative measure underscores the policy objective of maintaining stringent safety standards to protect both the crew and the public from aviation-related incidents.

Scope and Application

The Civil Aviation Regulations 1998, specifically within Part 39, establish comprehensive standards and directives to ensure the safety of civil aviation in Australia. One such directive, AD/HILLER 12/33, pertains to the inspection of tail rotor blades on Hiller UH-12 series helicopters, which are equipped with specific part number 55073 blades. This directive applies to all UH-12 series helicopters that are fitted with the designated tail rotor blades. The regulation mandates that the inspection of these blades for potential obstructions in the vent holes must be conducted at each daily or overnight inspection, and this task may be performed and certified by the pilot in command. The directive is designed to mitigate risks associated with obstructed vent holes that could potentially affect the safety and performance of the helicopter during operation. This regulatory requirement ensures that the safety standards set by the Civil Aviation Safety Authority are upheld within the Commonwealth of Australia.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives, includes an important directive concerning the Hiller UH-12 series helicopters (sections 11/81). This directive mandates the inspection of the tail rotor blade part number 55073 (AD/HILLER 12/33). The directive applies to all UH-12 series helicopters equipped with the specified tail rotor blades. The required inspection procedure is detailed in Hiller Aviation Service Bulletin No. 55-1, which necessitates that inspections occur at each daily or overnight inspection. Importantly, this inspection can be carried out and certified by the pilot in command, provided they adhere to the specified guidelines. Under these regulations, operators and pilots of the affected helicopters must ensure that the tail rotor blade part number 55073 is inspected as directed. This includes inspecting the vent holes at the inboard and outboard ends of the blade for any obstructions caused by dirt or debris. The directive aims to maintain the airworthiness of the helicopter by preventing potential obstructions that could compromise flight safety. Failure to comply with the AD/HILLER 12/33 directive can result in serious consequences. Non-compliance with airworthiness directives is a serious matter under the Civil Aviation Regulations 1998. Operators and pilots who do not adhere to the specified inspection requirements may face significant penalties. These can include fines, enforcement actions, or even the grounding of the aircraft until compliance is achieved. The regulations underscore the importance of these inspections for ensuring the safety and airworthiness of the aircraft, and thus, violations are taken very seriously.