AD/HU 269/74 - Belt Drive Pulley H-Frame Tie Bar Bracket - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, aim to ensure the safety of civil aviation within Australia. One specific directive under this regulation, AD/HU 269/74, pertains to Schweizer (Hughes) 269 Series Helicopters, addressing a critical safety concern involving the belt drive pulley H-frame tie bar bracket. This directive was introduced in response to numerous reports of cracked aluminium tie bar brackets, which posed a significant risk to the operational safety of the affected helicopters. The policy objective of this directive is to mandate a daily inspection of the specified helicopter models until the fitment of the recommended steel tie bar bracket assembly, thereby mitigating the risk of potential structural failures. Compliance with this directive ensures that the maintenance release includes the necessary documentation and certifications for the required inspection, with flexibility for the pilot in command or a licensed aircraft maintenance engineer to perform and certify the inspection.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, applies to all Schweizer (Hughes) 269 series helicopters, including model 269A, 269A-1, 269B, and 269C, that are fitted with certain parts as defined in the Airworthiness Directives. This legislation pertains to the mandatory inspection of belt drive pulley H-frame tie bar brackets, as stipulated in AD/HU 269/74. The directive mandates a daily inspection until the fitment of a specified steel tie bar bracket, in response to reports of cracked aluminium tie bar brackets. This requirement is applicable to aircraft maintained under the Aeronautical Notice 100.5.1, where the directive must be recorded on the maintenance release as maintenance required. The inspection can be conducted by the pilot in command without the need for certification, but in other cases, certification by a licensed aircraft maintenance engineer is necessary. The legislation has a Commonwealth reach and applies across the national jurisdiction. The applicability of this directive is confined to the specified Schweizer (Hughes) helicopter models and specific parts, ensuring that only those aircraft fitted with the identified components are subject to the mandated inspections. The directive extends its application through the requirement to be recorded on maintenance releases and specifies the roles of the pilot in command and licensed aircraft maintenance engineers in performing and certifying the inspections. This regulation does not specify any exclusions or exemptions, thereby ensuring that all applicable aircraft are subject to the same safety requirements.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, mandate the compliance with certain Airworthiness Directives (ADs) for particular aircraft models. Section AD/HU 269/74 pertains to Schweizer (Hughes) 269 Series Helicopters, focusing on the inspection of the belt drive pulley H-frame tie bar bracket (section 3/83). This directive applies to all model 269A, 269A-1, 269B and 269C helicopters equipped with specific H-frame assemblies and aluminium tie bar brackets as identified in the document Hughes Service Information N-184. Compliance with this directive requires a daily inspection of the belt drive pulley H-frame tie bar bracket until a steel tie bar bracket, P/No. 269A5517-13, is fitted. This inspection is essential to ensure safety and must be recorded on the maintenance release as maintenance required. The obligations imposed by this directive are quite specific. Aircraft owners, operators, and maintenance personnel must conduct a daily inspection of the tie bar bracket as specified. For aircraft maintained in accordance with Airworthiness Notice No. 100.5.1, the pilot in command may perform the inspection, but certification is not required. In other cases, the inspection must be certified by a licensed aircraft maintenance engineer. This directive is intended to mitigate the risk of cracked aluminium tie bar brackets, which the manufacturer has reported numerous instances of. The safety and operational integrity of the affected helicopters depend on strict adherence to these inspection requirements. Failure to comply with the AD/HU 269/74 could have serious legal and safety implications. The Civil Aviation Regulations 1998 impose penalties for non-compliance with airworthiness directives. These penalties can include substantial fines, potential grounding of the aircraft, and other enforcement actions by the Civil Aviation Safety Authority (CASA). In severe cases, the consequences could lead to criminal charges and imprisonment. The exact penalties can vary depending on the nature and extent of the non-compliance, but the overarching principle is that the safety of air travel is paramount, and any failure to adhere to these directives can have significant ramifications.