AD/GBK 117/4 - Landing Gear Electrical Bonding

Overview

The Civil Aviation Regulations 1998, administered by the Civil Aviation Safety Authority (CASA) and enacted by the Australian Parliament, were established to regulate civil aviation safety in Australia. One of the key components of these regulations is Part 39 - 105, which includes specific Airworthiness Directives aimed at ensuring the safe operation of aircraft. One such directive, AD/GBK 117/4, was introduced to address an identified safety issue with the Eurocopter BK 117 Series Helicopters, specifically relating to the electrical bonding of the landing gear. This directive was enacted to ensure that the bonding of the landing gear is adequate to eliminate electrostatic charges, thereby preventing potential safety hazards. The directive mandates compliance within 50 hours of the aircraft being in service after the directive was issued on 12 December 1991, as per the manufacturer's alert SB 117-90-104. The primary policy objective of AD/GBK 117/4 is to mitigate the risk of electrostatic discharge, which could potentially cause electrical malfunctions or fires. By requiring the implementation of the specified action within a limited timeframe, the directive aims to swiftly enhance the safety of the aircraft in question, specifically those with serial numbers ranging from 7001 to 7261. This proactive approach by CASA underscores the importance of continuous safety assessments and the prompt implementation of necessary modifications to maintain the highest standards of aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically under Part 39 - 105, encompasses the scope and application of the Civil Aviation Safety Authority Schedule of Airworthiness Directives for the Eurocopter BK 117 series helicopters. This directive, AD/GBK 117/4, mandates the implementation of specific actions concerning the landing gear electrical bonding for MBB-BK 117 aircraft within the serial number range of 7001 through 7261. The directive applies to these particular aircraft models to address the inadequacies identified by the manufacturer regarding the existing bonding of the landing gear, which is deemed insufficient for the satisfactory elimination of electrostatic charges. Compliance with the directive is required within 50 hours of time in service after the directive's effective date of 12 December 1991, necessitating adherence to the manufacturer's alert SB 117 -90-104. The geographic and jurisdictional reach of this directive is within the Commonwealth of Australia, and it is enforced by the Civil Aviation Safety Authority. There are no stated exclusions or exemptions mentioned in the directive, and the requirements are clearly defined to ensure safety and compliance across the specified aircraft models.

Key Provisions

The Civil Aviation Regulations 1998, specifically within Part 39 - 105, address the airworthiness directives for the Eurocopter BK 117 series helicopters, focusing on the landing gear electrical bonding, as outlined in AD/GBK 117/4. This directive applies to all MBB-BK 117 aircraft with serial numbers ranging from 7001 through 7261 (section 12/91). The requirement is that all affected aircraft must be modified in accordance with MBB Alert SB 117-90-104, which provides the specific technical instructions for resolving the identified issue with the landing gear electrical bonding (section 12/91). Compliance with these directives must be achieved within 50 hours of the aircraft being in service after the directive's effective date of 12 December 1991 (section 12/91). The Act imposes clear obligations on the owners and operators of the specified aircraft. They must ensure that the necessary modifications are carried out by qualified personnel within the stipulated timeframe. Failure to comply with the mandated modifications can result in the aircraft being deemed unairworthy, which would prevent it from being operated until the required work is completed (section 12/91). Additionally, the regulations require that thorough documentation of the compliance process be maintained and made available for inspection by the Civil Aviation Safety Authority (CASA) (section 12/91). Any breach of the Civil Aviation Regulations 1998 in relation to the airworthiness directives can lead to significant consequences. The Act provides for both civil and criminal penalties. For civil infractions, CASA may impose fines up to the maximum amount prescribed under the Civil Aviation Act 1988. In cases of serious non-compliance, which can be considered as reckless endangerment of safety, criminal charges may be laid. The maximum penalties can include fines and imprisonment, with the exact amounts varying based on the severity of the breach and any previous convictions (section 12/91). The enforcement of these penalties aims to ensure strict adherence to the safety standards set forth in the regulations.