AD/GOV/6 - Governor Pressure Relief Valve Roll Pin - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of Australia, form the fundamental legal framework for the regulation of civil aviation within Australia. A significant part of these regulations is Part 39, which outlines the requirements for the airworthiness of aircraft, ensuring the safety and reliability of aviation operations. Within this regulatory scheme, specific directives known as Airworthiness Directives (ADs) are issued by the Civil Aviation Safety Authority (CASA) to address identified safety issues. One such AD is AD/GOV/6, which pertains to the modification of the governor pressure relief valve roll pin in certain McCauley propeller governors. This directive was introduced to mitigate the risk of in-flight governor failure, thereby enhancing the overall safety of flight operations. The policy objective of this directive is to ensure that all applicable aircraft are equipped with the necessary modifications to maintain compliance with safety standards. The Airworthiness Directive AD/GOV/6 specifically targets various models of McCauley governors, including C290D3/T(), C290D4/T(), CF() ()310D2/T(), ()CF()S31D3/T(), DCF()S310D4/T(), DCF()S290D4/T(), DCF() ()290D2/T(), and DCF()S290D5/T(). The directive mandates that these governors must be modified to include a pressure relief valve roll pin, with the modification to be completed before the next reconditioning of the aircraft following 31 August 1979. The directive further specifies that governors already incorporating this modification will be identifiable by an "A" in the model number, while field-modified governors will have an "A" appended to the serial number. This directive is a crucial component in the ongoing efforts by CASA to maintain high safety standards in civil aviation.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 107 concerning Airworthiness Directives, applies to all McCauley governors of certain models, namely C290D3/T(), C290D4/T(), CF() () 310D2/T(), ()CF()S31D3/T(), DCF()S310D4/T(), DCF()S290D4/T(), DCF() ()290D2/T(), and DCF()S290D5/T(). The regulation mandates that these governors must undergo a modification to the governor pressure relief valve roll pin before being installed on an aircraft following reconditioning after 31 August 1979. The scope of the Act includes all relevant aircraft within the Commonwealth of Australia, ensuring compliance with safety standards set by the Civil Aviation Safety Authority. This requirement applies universally within Australia, encompassing both Commonwealth and state jurisdictions. Notably, governors that have already been produced with this modification will have a letter "A" in the model number, such as C290D3A/T6, while those modified in the field will have the suffix letter "A" added to their serial number. Compliance with these directives is overseen by referencing the McCauley SB No. 116 document. The application of these regulations can be further extended or refined through subordinate instruments as necessary.

Key Provisions

The main operative sections of the Civil Aviation Regulations 1998, particularly AD/GOV/6, focus on the modification of the governor pressure relief valve roll pin for specific McCauley governors models. These include models C290D3/T, C290D4/T, CF310D2/T, CF()S31D3/T, DCF()S310D4/T, DCF()S290D4/T, DCF()290D2/T, and DCF()S290D5/T (section 39.107). The directive mandates that these modifications be implemented before the next reconditioning of the aircraft following 31 August 1979. Governors that are already produced with this modification will be identifiable by a letter "A" in the model number, such as C290D3A/T6, while those modified in the field will have the suffix letter "A" added to their serial number. Compliance is to be verified using McCauley SB No. 116. The obligations imposed by the Civil Aviation Regulations 1998 on the parties governed by AD/GOV/6 are clear and specific. Operators and maintenance personnel must ensure that the specified McCauley governors are modified according to the directive before the next scheduled reconditioning of the aircraft after 31 August 1979. This requirement ensures that the aircraft's safety is maintained by incorporating the necessary modifications to the governor pressure relief valve roll pin. Operators must also maintain accurate records of the modifications, including the identification of modified components as per the directive. Any deviations from these requirements could compromise the airworthiness of the aircraft and potentially lead to regulatory non-compliance. Failure to comply with the provisions of AD/GOV/6 can lead to serious consequences, both civil and criminal. Under the Civil Aviation Regulations 1998, non-compliance can result in enforcement actions by the Civil Aviation Safety Authority (CASA). The potential penalties for non-compliance include fines and other sanctions, which are determined by the severity of the breach and its impact on aviation safety. In more serious cases, non-compliance could lead to prosecution under criminal law, with penalties that could include imprisonment. The specific penalties are not detailed in the directive but are governed by the broader legal framework of the Civil Aviation Act 1988 and related regulations, which can impose substantial financial and legal repercussions for non-compliance.