AD/DHC-3/24 - Main Landing Gear Fuselage Attachment Bolts

Overview

The Civil Aviation Regulations 1998, as amended by the Legislative Instrument F2006B09073, establish specific Airworthiness Directives to ensure the safety and reliability of aircraft operating in Australian airspace. This particular legislative instrument addresses a gap in the maintenance requirements for DHC-3 (Otter) series aeroplanes, specifically targeting issues with the main landing gear fuselage attachment bolts. The problem it seeks to resolve is the potential for cracking in these critical bolts, which could compromise the structural integrity of the aircraft. The policy objective is to mandate regular inspections and maintenance of these bolts to prevent failures that could lead to catastrophic outcomes. Enacted by the Australian Parliament, this regulation is part of a broader framework aimed at maintaining the highest standards of aviation safety.

Scope and Application

The Civil Aviation Safety Authority's Schedule of Airworthiness Directives under the Civil Aviation Regulations 1998, specifically Part 39 - 105 AD/DHC-3/24, pertains to all models of DHC-3 (Otter) Series Aeroplanes. This legislation applies to aircraft operators and maintenance personnel who are responsible for ensuring that the specified main landing gear to fuselage attachment bolts are inspected and maintained in accordance with the directive. The geographic reach of this regulation is national, governing the aviation industry throughout Australia. It is essential for maintaining the safety standards of these aircraft, focusing on critical structural components to prevent failure during operation. The directive mandates that the specified bolts must be inspected using a magnetic particle method for cracking, particularly around the grease outlet hole, within 100 hours of time in service following the directive's effective date of 15 April 1969, and then at intervals not exceeding 500 hours of time in service thereafter. This regulatory framework ensures the continued airworthiness and safety of the DHC-3 series aircraft within the Australian airspace.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 under the Civil Aviation Safety Authority Schedule of Airworthiness Directives, outlines detailed requirements for maintaining the airworthiness of DHC-3 (Otter) series aeroplanes. Section 3/69 mandates that all DHC-3 models must undergo an inspection of the main landing gear to fuselage attachment bolts, specifically those with part numbers C3U72-3 and C3U142-5, using a magnetic particle inspection method to check for any signs of cracking, particularly around the grease outlet hole. This inspection must be performed within 100 hours of time in service after April 15, 1969, and then at intervals not exceeding 500 hours of time in service thereafter (Civil Aviation Regulations 1998, Part 39 - 105, AD/DHC-3/24). These provisions impose a clear obligation on aircraft operators and maintenance personnel to ensure that the specified bolts are regularly inspected and maintained according to the stipulated intervals. The requirement to use a magnetic particle inspection method ensures a thorough and effective assessment of the bolts' integrity, thereby enhancing the overall safety and reliability of the aircraft. Operators must keep detailed records of each inspection, including the date, the person who performed the inspection, and the findings, to demonstrate compliance with the regulatory requirements (Civil Aviation Regulations 1998, Part 39 - 105, AD/DHC-3/24). Failure to comply with these airworthiness directives can result in serious consequences. The Civil Aviation Safety Authority may take enforcement action against operators who neglect to adhere to these inspection requirements. Potential penalties for non-compliance may include fines and other civil or criminal penalties as deemed appropriate by the authority. In severe cases, non-compliance could lead to the grounding of the aircraft until the required inspections and repairs are completed, potentially disrupting flight schedules and operations (Civil Aviation Regulations 1998, Part 39 - 105, AD/DHC-3/24). The precise maximum penalties are not detailed in the provided text, but they can be significant, reflecting the critical importance of maintaining airworthiness standards.