AD/DC4/38 - Lower Main Plane Stringers Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, constitute a comprehensive framework designed to ensure the safety and efficiency of civil aviation within Australia. Part 39, specifically Section 105, addresses Airworthiness Directives, with the legislative instrument F2006B08845 focusing on the inspection of Douglas DC4 series aeroplanes to mitigate potential safety risks. This regulation was introduced to address the identified problem of structural integrity, particularly concerning the cracking of stringers in the lower main plane of Douglas DC4 aircraft. The policy objective of this directive is to mandate regular inspections to detect and rectify any structural deficiencies, thereby enhancing the overall airworthiness of the aircraft and ensuring compliance with safety standards set by the Civil Aviation Safety Authority. The enforcement of such directives is pivotal in maintaining the safety and reliability of civil aviation operations in Australia.

Scope and Application

The Civil Aviation Regulations 1998, specifically PART 39 - 105, pertains to the regulation and enforcement of civil aviation safety standards in Australia, ensuring the safe operation of aircraft within the nation's airspace. This regulation applies to all Douglas DC4 series aeroplanes, mandating the inspection of the lower main plane stringers to ensure airworthiness. The regulation is applicable to all entities operating these aircraft, including airlines, private operators, and maintenance service providers within the Commonwealth of Australia. It encompasses the inspection of stringers 18, 19, 20, and 21 between the front and centre lower main plane spars from wing station 167 to wing station 281 using a radiographic technique approved by the Secretary, thereby ensuring adherence to the highest safety standards. This regulation does not explicitly state any exclusions or exemptions but is subject to interpretation and potential adjustments through subordinate instruments issued by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, establish the Civil Aviation Safety Authority's (CASA) Schedule of Airworthiness Directives. Under this schedule, AD/DC4/38 pertains to the inspection of Douglas DC4 Series Aeroplanes. According to section 1 of AD/DC4/38, the directive applies to all models of Douglas DC4 Series Aeroplanes. The requirement outlined in section 2 is that an inspection for cracking of stringers 18, 19, 20, and 21 must be conducted between the front and centre lower mainplane spars, from wing station 167 to wing station 281. This inspection must be performed using a radiographic technique that has been accepted by the Secretary. The obligations imposed by this Airworthiness Directive are primarily on the operators and maintenance personnel of the Douglas DC4 Series Aeroplanes. They are required to adhere to the inspection procedures specified by CASA. This involves using an approved radiographic technique to ensure the integrity of the specified stringers. The goal is to identify any potential cracks that could compromise the structural integrity of the aircraft, thereby ensuring the safety of passengers and crew. Non-compliance with the provisions of AD/DC4/38 can lead to significant consequences. Under the Civil Aviation Act 1988, failure to adhere to an Airworthiness Directive can result in the aircraft being deemed unairworthy. This could lead to grounding of the aircraft until the required inspections and repairs are completed. Furthermore, operators found in breach of these regulations could face civil penalties, including fines. In more serious cases, criminal charges could be pursued, leading to imprisonment. The exact penalties are determined by the severity of the breach and are outlined in relevant sections of the Civil Aviation Act 1988 and the Civil Aviation Regulations 1998.