AD/HU 269/52 - Linear Clutch Actuator - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Parliament, are a comprehensive set of rules governing all aspects of civil aviation in Australia. One of the key components of these regulations is Part 39, which pertains to airworthiness directives. Specifically, the regulations include detailed safety directives, such as AD/HU 269/52, which applies to Schweizer (Hughes) 269 Series Helicopters. This directive addresses the critical issue of ensuring the airworthiness of linear clutch actuators in certain helicopter models. The aim of this regulation is to mitigate safety risks associated with faulty actuators by mandating inspections and necessary replacements of specific screws. The directive, issued by the Civil Aviation Safety Authority, seeks to ensure that all operators comply with these safety measures to maintain the highest standards of aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, pertains to airworthiness directives issued by the Civil Aviation Safety Authority (CASA) for Schweizer (Hughes) 269 Series Helicopters, particularly AD/HU 269/52 concerning the inspection of the linear clutch actuator. This legislation applies to all models of Schweizer (Hughes) 269 Series helicopters equipped with specific linear clutch actuators identified by the part numbers DL 1020 M81C (12V) and 269A4564 on DL 1020M82C (28V). The directive mandates that operators must inspect the retainer screws securing the lug to the housing of the linear clutch actuator, replacing any screws with a single band of vertical lines on the raised head with specified new screws and torque them to the appropriate levels. Additionally, operators who have already replaced the screws according to an earlier directive are exempt from further replacement if they have followed the stipulated procedures. The directive must be complied with within 10 hours of the helicopter being in service after 17 March 1975, and the actuator must be marked with a hand impression of the letter "B" on the data plate. This regulation underscores the importance of stringent safety measures in ensuring the continued airworthiness of these aircraft.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, include an airworthiness directive AD/HU 269/52 that pertains to Schweizer (Hughes) 269 Series Helicopters. This directive mandates specific inspections and maintenance procedures for the linear clutch actuators on these aircraft models. Section A of the directive requires operators to remove and visually inspect the linear clutch actuator and cover at the lug end, referencing the Hughes 269 Series Maintenance Manual of Instructions from April 1973, Revision No. 2 dated January 1, 1974. Specifically, operators must identify the markings on the four number 4-40 Allen head screws that secure the lug to the housing. If any of these screws have a single band of vertical lines around the outside diameter of the raised head, the screw must be mutilated, discarded, and replaced with a new screw of part number P60HS440-12C or S6370CESLS4-12, torqued to five to seven inch-pounds. Operators who have previously replaced the screws in accordance with Hughes SIN No. N-126 dated February 24, 1975, are exempt from repeating the replacement process if they follow the specified procedure. Operators must ensure compliance within 10 hours of time in service after the directive's effective date, 17 March 1975. Section B of the directive requires that once the inspections and replacements are complete, the actuators must be stamped with a hand impression of the letter “B” on the bottom line of the actuator data plate. This ensures that the necessary modifications have been performed and documented. The obligations imposed by this directive are clear and precise. Operators of Schweizer (Hughes) 269 Series Helicopters must perform the specified inspections and replacements of the linear clutch actuator screws. This involves meticulous attention to the condition and markings of the screws, as well as the proper torque application when reinstalling new screws. Failure to comply with these requirements can result in serious safety implications, as the directive is aimed at ensuring the airworthiness and reliability of the affected helicopter models. Violating the provisions of this airworthiness directive can lead to serious consequences. Under the Civil Aviation Act 1988, non-compliance with airworthiness directives can be considered an offence. The maximum penalty for contravening these regulations is substantial, with fines of up to $16,200 for individuals and $81,000 for corporations. Additionally, non-compliance can lead to the grounding of the affected aircraft until the necessary inspections and repairs are completed, potentially resulting in significant operational disruptions and safety risks.