AD/HU 369/52 - Attachment Hardware for Sta-Strap Securing Electric Wiring to Boom Fairing at Sta 138.50 - Inspection

Overview

The Civil Aviation Regulations 1998, specifically Part 39 - 105, address the issue of ensuring the airworthiness of aircraft through the issuance of Airworthiness Directives (ADs). This legislative instrument was enacted by the Commonwealth of Australia to ensure safety standards are met in the civil aviation sector. The regulation was designed to fill the gap in maintaining aircraft safety by providing clear and mandatory directives for operators and maintenance personnel to follow. The Civil Aviation Safety Authority is the enacting body responsible for the oversight and enforcement of these regulations. The policy objective is to prevent the inadvertent installation of incorrect hardware, such as steel washers under aluminium rivets, which can compromise the structural integrity and safety of the aircraft. One such directive, AD/HU 369/52, pertains to McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters, focusing on the attachment hardware for the Sta-Strap securing electric wiring to the boom fairing at STA 138.50. This directive mandates that all affected model 369D helicopters with specified serial numbers must be inspected within 100 hours of time in service after 31 December 1981. The directive references Hughes Service Information Notice No. DN-96, ensuring that compliance is strictly adhered to in order to maintain the required safety standards.

Scope and Application

The Civil Aviation Safety Authority, under the Civil Aviation Regulations 1998, has issued an Airworthiness Directive concerning the McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters. Specifically, AD/HU 369/52 pertains to the attachment hardware for the Sta-Strap securing electric wiring to the boom fairing at Station 138.50. This directive applies to all model 369D helicopters with specific serial numbers as referenced in Hughes Service Information Notice No. DN-96 or any subsequent issues or revisions of that notice. The directive aims to ensure compliance with the inspection requirements within 100 hours of time in service after 31 December 1981, addressing the potential inadvertent installation of a steel washer under the aluminium rivet at the specified station. The regulation is enforceable throughout the Commonwealth of Australia and its territories, with no stated exclusions or exemptions, thereby ensuring a standardised approach to aviation safety across the country. Any modifications or extensions to this directive may be issued through subordinate instruments by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, includes Airworthiness Directives (ADs) which are legal requirements aimed at maintaining the airworthiness of aircraft. Section 105 details an AD (AD/HU 369/52) concerning McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters. This AD mandates a particular inspection of attachment hardware for the Sta-Strap securing electric wiring to the boom fairing at Station 138.50. The directive applies to all model 369D helicopters with serial numbers referenced in Hughes Service Information Notice No. DN-96 or any subsequent revisions of that notice (Section 105(1)). Compliance with this directive requires the inspection to be performed within 100 hours of time in service after 31 December 1981 (Section 105(2)). The obligations imposed by this AD are straightforward yet crucial for ensuring safety. Operators of model 369D helicopters must ensure that the inspection is conducted within the stipulated timeframe. This involves identifying and verifying the presence of a steel washer under the aluminium rivet securing the electric wiring to the boom fairing at Station 138.50. Any inadvertent installation of a steel washer is a concern, as it could compromise the structural integrity and safety of the helicopter. Operators must rely on the Service Information Notice No. DN-96 to identify the specific serial numbers that are subject to this inspection requirement. Failure to comply with the AD can lead to severe consequences. The Civil Aviation Safety Authority (CASA) may take enforcement actions against operators who do not adhere to the inspection requirements. Potential penalties include fines, enforcement notices, or even the grounding of non-compliant aircraft. The seriousness of the AD reflects the potential risk that an incorrectly installed steel washer poses to the safety of the aircraft and its occupants. The regulations do not explicitly state the maximum penalties, but it is clear that non-compliance could result in significant repercussions for the operator and potentially endanger flight operations.