AD/GBK 117/12 - Transmission and Engine Cowling Hook System

Overview

The Civil Aviation Regulations 1998, amended by the Civil Aviation Amendment (Enhancing Air Safety) Regulations 2006 (F2006B10259), address a specific safety concern regarding the Eurocopter BK 117 Series Helicopters. This legislative instrument was enacted to ensure that all Model MBB BK-117 helicopters with specified serial numbers adhere to stringent safety protocols by installing a hook system to the doors of the transmission and engine cowlings. This measure was introduced to mitigate the risk of these doors opening fully during flight, which could occur if the door fasteners were not correctly latched during pre-flight checks. The policy objective is to enhance air safety by preventing potentially hazardous situations arising from improperly secured cowlings, thereby safeguarding the integrity of the aircraft and the safety of those onboard. Compliance with these directives is mandatory and must be achieved before 30 June 2000, unless already fulfilled. This legislative instrument, overseen by the Australian Government, is part of a broader effort to address identified gaps in airworthiness standards, ensuring that civil aviation operations in Australia meet international safety benchmarks. The directive became effective on 30 December 1999, underscoring the urgency and importance of these safety measures.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105, govern the safety standards for airworthiness directives in Australia, and in this instance, it pertains to the Eurocopter BK 117 Series Helicopters. The particular Airworthiness Directive AD/GBK 117/12 relates to the transmission and engine cowling hook system, which is mandated for all Model MBB BK-117 helicopters with specific serial numbers. The directive applies to those serial numbers ranging from 7001 through 7253, and 7500 through 7523, requiring compliance with Eurocopter Deutschland Service Bulletin MBB BK 117-20-109 Revision 2, dated April 30, 1999. It is crucial to note that compliance with Alert Service Bulletin MBB BK 117-20-104 is a prerequisite for certain serial number helicopters, as outlined in AD/GBK 117/3 Amendment 1. Operators must ensure that the specified actions are completed by 30 June 2000, or before if already scheduled, and the directive has been effective since 30 December 1999. This legislative instrument ensures that the hook system is installed to prevent the transmission and engine cowling doors from opening fully during flight, thus addressing potential hazards that could arise from improperly latched door fasteners during pre-flight checks.

Key Provisions

The Civil Aviation Regulations 1998 (Cth), particularly Part 39, contain provisions related to airworthiness directives, including the requirement for specific maintenance and modifications to certain aircraft models to ensure safety. One such directive, AD/GBK 117/12, pertains to the Eurocopter BK 117 series helicopters, specifically those with serial numbers ranging from 7001 to 7253 and 7500 to 7523. This directive mandates actions to be taken in accordance with Eurocopter Deutschland Service Bulletin MBB BK 117-20-109 Revision 2, dated April 30, 1999. Importantly, the completion of Alert Service Bulletin MBB BK 117-20-104 is a prerequisite for compliance with this directive for certain serial number helicopters, as addressed by AD/GBK 117/3 Amendment 1. The directive requires compliance before June 30, 2000, unless the actions have already been completed. The directive became effective on December 30, 1999. The obligations imposed by this airworthiness directive are clear and specific. Operators of Eurocopter BK 117 series helicopters within the specified serial number range must ensure that the transmission and engine cowling doors are equipped with a hook system to prevent them from opening fully during flight. This measure is critical to prevent accidents that could occur if the doors were to inadvertently open due to improperly latched fasteners during pre-flight checks. Additionally, for certain helicopters, the completion of Alert Service Bulletin MBB BK 117-20-104 is required prior to compliance with this directive, as stipulated in AD/GBK 117/3 Amendment 1. Failure to comply with the requirements set out in AD/GBK 117/12 can lead to serious consequences. Non-compliance with airworthiness directives is an offence under the Civil Aviation Act 1988 (Cth), and those responsible may face significant penalties. While the specific penalties are not detailed in the airworthiness directive itself, non-compliance with airworthiness requirements generally can result in enforcement actions by the Civil Aviation Safety Authority (CASA), including fines and potential grounding of the aircraft until the required actions are completed. The seriousness of these consequences underscores the importance of adhering to the directive to maintain the highest safety standards in civil aviation.