AD/DHC-6/7 Amdt 1 - Elevator Rear Spar - Inspection and Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, aim to provide a robust regulatory framework for ensuring the safety of civil aviation within the country. This legislation, overseen by the Civil Aviation Safety Authority, is designed to address the inherent risks associated with air travel by establishing comprehensive standards and directives for aircraft operation, maintenance, and airworthiness. One such directive, identified as AD/DHC-6/7 Amendment 1, pertains specifically to the inspection and modification of the elevator rear spar for DHC-6 (Twin Otter) series aeroplanes with serial numbers ranging from 1 to 105. The policy objective of this amendment is to mitigate potential safety hazards by mandating regular inspections and necessary modifications in accordance with specified De Havilland Canada modification bulletins. This ensures that the aircraft remain compliant with safety standards and are maintained in a safe operational condition.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, issued under the Civil Aviation Act 1988, pertain to the regulation of airworthiness directives for aircraft. This legislative instrument addresses the DHC-6 (Twin Otter) Series Aeroplanes, with the directive AD/DHC-6/7 Amendment 1 focusing on elevator rear spar inspection and modification. The directive applies to all models with serial numbers from 1 to 105, mandating compliance with De Havilland Canada modification bulletins 6/1134 and 6/1135. This legislation ensures that specified aircraft are inspected according to the guidelines of bulletin 6/1134 at intervals not exceeding 50 hours of time in service, with modifications to be completed in accordance with bulletin 6/1135 before 1 April 1968. The scope of this directive is narrowly focused on ensuring the safety and airworthiness of the affected Twin Otter aircraft models within the Australian jurisdiction, governed by the Civil Aviation Safety Authority.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105, detail the Civil Aviation Safety Authority (CASA) Schedule of Airworthiness Directives for DHC-6 (Twin Otter) series aeroplanes. The focus of AD/DHC-6/7 Amendment 1 is on the Elevator Rear Spar, mandating inspection and modification procedures for specific models. According to section (1/68), the directive applies to all DHC-6 models with serial numbers ranging from 1 to 105. The compliance requirements necessitate that inspections be performed in accordance with De Havilland of Canada Modification Bulletins 6/1134 and 6/1135. These inspections must occur at intervals not exceeding 50 hours of time in service until the aeroplanes are modified to comply with the respective bulletins. Furthermore, modifications must be completed in line with Modification Bulletin 6/1135 before 1 April 1968. The obligations imposed by this directive are clear and stringent. Operators of DHC-6 series aeroplanes must ensure that all applicable aircraft within the specified serial number range are inspected and, if necessary, modified to meet the outlined standards. This involves adherence to the detailed procedures set forth in the De Havilland of Canada Modification Bulletins. Operators must also ensure that these inspections and modifications are conducted within the stipulated timeframe, specifically before the deadline of 1 April 1968. Failure to comply with these obligations could result in non-compliance with the airworthiness requirements set by CASA, potentially leading to severe operational consequences. Violating the provisions of AD/DHC-6/7 Amendment 1 can result in significant civil and potentially criminal consequences. Under the Civil Aviation Regulations 1998, non-compliance with airworthiness directives can lead to enforcement actions by CASA. Civil penalties for such violations can include fines and potential grounding of the non-compliant aircraft. Additionally, in cases where non-compliance is deemed to pose a significant safety risk, CASA may pursue criminal charges against responsible individuals or entities. The maximum penalties for these offences can be substantial, reflecting the serious nature of ensuring aviation safety and the potential risks associated with non-compliance.