AD/HU 269/76 - Main Rotor Damper Pitch Bearing Case - Inspection and Modification

Overview

The Civil Aviation Regulations 1998, as amended by F2006B10635, were enacted to address safety concerns specific to certain aircraft models. This legislative instrument focuses on the Schweizer (Hughes) 269 series helicopters, particularly the issue of cracking around the damper attachment bolt hole in the main rotor damper pitch bearing. The problem arose from the torquing of the attachment bolt nut, which prompted the manufacturer to recommend a dye penetrant inspection in this area until a spacer could be fitted under the nut washer. The policy objective of this regulation is to enhance the airworthiness of these helicopters by ensuring that identified structural issues are rectified through appropriate inspection and modification procedures. This directive applies to all model 269A, 269A-1, and 269B series helicopters, as well as the 269C series from serial number 0001 through 1165, and is enforced by the Civil Aviation Safety Authority.

Scope and Application

The Civil Aviation Regulations 1998, as amended by the Civil Aviation Safety Authority, pertains specifically to the maintenance and airworthiness of Schweizer (Hughes) 269 series helicopters, including the model 269A, 269A-1, 269B, and 269C serial numbers 0001 through 1165. This regulation applies to all entities and persons involved in the operation, maintenance, or servicing of these aircraft models within Australia. The geographic reach of this regulation is nationwide, as it is a Commonwealth regulation. The directive mandates a thorough inspection and modification of the main rotor damper pitch bearing to prevent cracking around the damper attachment bolt hole, a risk identified by the manufacturer. Compliance with this directive is mandatory for any post-31 January 1984 operations, as detailed in the requirement document and service information notice N-189. This regulation is intended to ensure the safety and operational integrity of the specified helicopter models by mandating specific maintenance procedures.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, establish critical guidelines for maintaining the airworthiness of certain aircraft. The Schweizer (Hughes) 269 Series Helicopters Airworthiness Directive (AD) numbered HU 269/76, which pertains to the main rotor damper pitch bearing, outlines the mandatory inspection and modification requirements (Section 1/84). This directive applies to all model 269A, 269A-1, 269B series, and 269C helicopters with serial numbers ranging from 0001 through 1165. Under this directive, operators and owners of the specified helicopters must ensure that the main rotor damper pitch bearing is inspected for any signs of cracking around the damper attachment bolt hole. This inspection should be carried out after the attachment bolt nut has been torqued, as per the manufacturer's recommendations documented in Service Information Notice N-189. Operators must comply with these requirements effective from 31 January 1984, ensuring that any identified issues are addressed promptly to maintain the aircraft's airworthiness. The directive also stipulates the use of a dye penetrant inspection method to detect such cracks effectively. Failure to comply with the AD/HU 269/76 requirements can result in significant consequences. Non-compliance with airworthiness directives is a serious matter under Australian civil aviation law. If an operator or owner fails to adhere to these mandatory inspection and modification protocols, they may face enforcement actions. Such actions could include the suspension or revocation of the aircraft's certificate of airworthiness, leading to the aircraft being grounded until the required modifications are made. Furthermore, any resultant flight operations that breach these regulations could result in civil penalties, including fines and potential criminal charges, depending on the severity of the non-compliance and any subsequent safety risks posed. The exact penalties are not detailed in the provided text, but they can be severe, reflecting the critical nature of maintaining airworthiness in aviation.