AD/S-76/25 Amdt 1 - MLG Positioning Rod and Lower Drag Race Rod End Assemblies

Overview

The Civil Aviation Regulations 1998, under the authority of the Civil Aviation Safety Authority (CASA) and the Commonwealth of Australia, was enacted to establish and enforce regulations pertaining to civil aviation safety in Australia. This legislation aims to ensure that civil aviation operations within Australian airspace meet stringent safety standards to protect the public and maintain the integrity of the aviation industry. One such regulation is found in Part 39 - 105, specifically addressing airworthiness directives for Sikorsky S-76 Series Helicopters, with Amendment 1 concerning the MLG Positioning Rod and Lower Drag Race Rod End Assemblies. This regulation was introduced to address the identified safety concerns related to the landing gear positioning rod ends of specific models of S-76A helicopters, ensuring that these components meet the required safety standards through specified inspections and modifications. Compliance with these directives is crucial for maintaining the airworthiness of the aircraft and ensuring safe operational practices.

Scope and Application

The Civil Aviation Safety Authority (CASA) has issued an Airworthiness Directive (AD) under the Civil Aviation Regulations 1998, specifically targeting the Sikorsky S-76 Series Helicopters. This AD, numbered AD/S-76/25 Amendment 1, mandates that all models of the S-76A series prior to serial number 760308 undergo specific inspections and modifications concerning the MLG (Main Landing Gear) Positioning Rod and Lower Drag Race Rod End Assemblies. The directive is applicable nationwide, adhering to the Commonwealth's regulatory standards. It requires compliance with Sikorsky Alert Service Bulletin SB 76-32-10 for inspections and Sikorsky Customer Service Notice CSN 76-134A for modifications. Additionally, the directive references Federal Aviation Administration (FAA) AD 82-25-01 R 1. The inspections must be conducted for aircraft with landing gear positioning rod ends that have accumulated 1500 or more hours of service after 31 December 1986, within 25 hours of service after that date, and at each Maintenance Release inspection thereafter. For aircraft with less than 1500 hours of service after 31 December 1986, inspections must occur before 1525 hours of service and at each Maintenance Release inspection thereafter. Modifications are required within 300 hours of service after 31 December 1986 or before 30 June 1987, whichever comes first. It is noteworthy that the installation of the landing gear modification kit terminates the need for further inspections as stipulated in this Directive.

Key Provisions

The Civil Aviation Regulations 1998 (Cth) specifically address the airworthiness of Sikorsky S-76 Series helicopters through the Airworthiness Directive (AD) AD/S-76/25 Amendment 1 (paragraph 39-105). This directive applies to all models of the S-76A series prior to serial number 760308. The main requirements outlined in this directive include a specific inspection and a modification of the landing gear positioning rod and lower drag race rod end assemblies (paragraph 39-105(1)). The inspection must be conducted in accordance with Sikorsky Alert SB 76-32-10, while the modification must adhere to Sikorsky Customer Service Notice (CSN) 76-134A. Additionally, Federal Aviation Administration (FAA) AD 82-25-01 R 1 is referenced for further guidance. The obligations imposed by this directive are clear and structured. Operators of the specified Sikorsky S-76A helicopters must ensure that the inspections and modifications are carried out as stipulated. For aircraft with landing gear positioning rod ends that have accumulated 1500 or more hours of service after 31 December 1986, inspections must occur within 25 hours of service and then at each Maintenance Release inspection thereafter. For aircraft with less than 1500 hours of service after 31 December 1986, inspections must take place before reaching 1525 hours of service and then at each Maintenance Release inspection. Furthermore, the modifications must be completed within 300 hours of service after 31 December 1986, or before 30 June 1987, whichever comes first. It is also crucial to note that the installation of the landing gear modification kit exempts the aircraft from the inspection requirements outlined in this directive (paragraph 39-105(1)). Failure to comply with the provisions of AD/S-76/25 Amendment 1 can result in significant consequences. Non-compliance with airworthiness directives can lead to the aircraft being deemed non-airworthy, which can result in grounding of the aircraft. This not only impacts the operational capabilities of the aircraft but also poses safety risks. Under the Civil Aviation Act 1988 (Cth), non-compliance may result in enforcement actions, including fines and potential criminal charges for operators and maintenance personnel. The maximum penalties for such breaches can vary, but they may include substantial financial penalties and imprisonment, reflecting the serious nature of ensuring airworthiness and public safety.