Overview

The Civil Aviation Regulations 1998, specifically PART 39 - 105, addresses the issue of ensuring the airworthiness of aircraft, including the safety and reliability of components such as the control system linkage. Enacted by the Civil Aviation Safety Authority (CASA), this legislation aims to mitigate risks associated with aircraft operations and prevent accidents due to mechanical failures. The policy objective is to enhance the safety of civil aviation by issuing Airworthiness Directives that mandate corrective actions when potential safety issues are identified. An example of this is AD/HILLER 12/43, issued in response to a reported accident involving the separation of a control system linkage in a Model UH-12E helicopter, which seeks to prevent such incidents by requiring the replacement of specific bolts and installation of castellated nuts and cotter pins. This directive became effective on 22 March 2001 and required compliance within 12 months of its issuance or at the next annual inspection, whichever came first.

Scope and Application

This Airworthiness Directive issued under the Civil Aviation Regulations 1998 applies specifically to all models of the Hiller UH-12 series helicopters, including the UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4. The directive mandates that all undrilled-shank bolts at pivoting joints in the control system linkage of these helicopters must be replaced with drilled-shank bolts, and that castellated nuts and cotter pins must be installed in accordance with the specifications outlined in Hiller Aircraft Corporation Service Bulletin No. 10-4, Revision 2, dated December 20, 1999. Compliance with this directive is required at the next annual inspection or within 12 months from 22 March 2001, whichever comes first, unless the actions have already been completed. The directive becomes effective from 22 March 2001 and is intended to prevent accidents caused by separation of the control system linkage, thereby ensuring the safety of these aircraft.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, includes a detailed Airworthiness Directive (AD) concerning the Hiller UH-12 Series helicopters. This directive, identified as AD/HILLER 12/43, applies to the models UH-12, UH-12A, UH-12B, UH-12C, UH-12D, UH-12E, UH-12E-L, UH-12L, and UH-12L4. The directive was issued to address a reported accident where the control system linkage of a Model UH-12E helicopter separated, leading to a loss of control. The directive requires the replacement of all undrilled-shank bolts at the pivoting joints in the control system linkage with drilled-shank bolts, and the installation of castellated nuts and cotter pins, following the guidelines set out in Hiller Aircraft Corporation Service Bulletin No. 10-4, Revision 2, dated 20 December 1999. The compliance section mandates that this action must be taken at the next annual inspection or within 12 months of 22 March 2001, whichever is earlier, unless the task has already been completed. The AD imposes several obligations on the parties or entities it governs. Operators of the specified Hiller UH-12 Series helicopters must ensure that the required modifications to the control system linkage are made as stipulated. This includes replacing the specified bolts, nuts, and pins, and following the exact procedures laid out in the referenced service bulletin. Compliance with the AD is critical to maintaining the airworthiness of the helicopters and ensuring the safety of all passengers and crew. Failure to comply with these requirements can result in severe safety risks and may lead to regulatory actions against the operators. The Civil Aviation Regulations 1998 also include provisions for offences and penalties in case of non-compliance with the AD. While the specific penalties are not detailed in the text provided, it is known that breaches of airworthiness directives can lead to significant consequences. In the context of civil aviation, non-compliance can result in fines, suspension of airworthiness certificates, and potential grounding of the aircraft until the required actions are completed. The severity of the penalties is intended to enforce strict adherence to safety regulations and ensure that all operators maintain the highest standards of aircraft maintenance and operation.