AD/GENERAL/50 - Whelen Strobe Light - Modification

Overview

The Civil Aviation Regulations 1998, enacted by the Parliament of the Commonwealth of Australia, provide a comprehensive regulatory framework governing civil aviation safety in Australia. Specifically, Part 39, Section 105, includes Airworthiness Directives that address various safety concerns related to aircraft operations. One such directive, AD/GENERAL/50, pertains to the Whelen Strobe Light modification for aircraft equipped with Whelen A427 strobe light flash tubes manufactured before 1 November 1974. This directive was introduced to address potential safety issues associated with these older flash tubes by requiring the installation of a pressure-sensitive vinyl label or a strip of Scotch Brand Type 33 vinyl plastic electrical tape on the base of the flash tubes. The directive aims to ensure compliance within 100 hours of time in service after 30 May 1975, thereby enhancing the safety and reliability of aircraft operations.

Scope and Application

The Civil Aviation Regulations 1998, as amended, under Part 39 - 105, specifically the Airworthiness Directives, pertain to the modification of Whelen strobe light systems on aircraft. This directive applies to all aircraft equipped with Whelen A427 strobe light flash tubes that were manufactured prior to 1 November 1974. The requirement is that a pressure sensitive-vinyl label conforming to Whelen Engineering Company Incorporated Drawing A-300052, Revision 1, dated October 15, 1974, or alternatively, a strip of Scotch Brand Type 33 vinyl plastic electrical tape, must be installed on the base of the strobe light flash tubes. In the case of the electrical tape, it must be shaped to cover the rivet at the rear of the flash tube without obscuring the identifying part number. If the flash tube already has a label, the new label or tape can be installed directly over the old one. The installation of the label or tape must be conducted when both the label or tape and the flash tube are above a temperature of 10 degrees Celsius to ensure proper adhesion. Compliance with this directive is mandatory and must be achieved within the next 100 hours of time in service following 30 May 1975.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39 - 105 (section 39.105), pertains to the airworthiness directives regarding aircraft. The regulation in focus here is AD/GENERAL/50, which addresses the Whelen Strobe Light modification. This directive applies to all aircraft equipped with Whelen A427 strobe light flash tubes that were manufactured before 1 November 1974 (section 1). The requirement under this directive is to install a pressure-sensitive vinyl label on the base of the strobe light flash tubes. This label must conform to Whelen Engineering Company Incorporated Drawing A-300052, Revision 1, dated October 15, 1974, or alternatively, a strip of Scotch Brand Type 33 vinyl plastic electrical tape can be used in lieu of the vinyl label. If using the electrical tape, it must cover the rivet at the rear of the flash tube without obscuring the identifying part number. If the flash tube already has a label, the new label or tape may be installed directly over the existing one. The obligations imposed by this regulation require that the specified modification to the Whelen A427 strobe light flash tubes be completed within the next 100 hours of time in service after 30 May 1975 (section 2). It is crucial to ensure that the installation of the label or tape is carried out when both the label or tape and the flash tube are at a temperature above 10 degrees Celsius to guarantee proper adhesion. This procedural detail underscores the importance of following the manufacturer’s guidelines to maintain the integrity and effectiveness of the strobe light system. Failure to comply with these airworthiness directives may result in significant consequences. The regulations do not explicitly state the specific civil or criminal penalties for non-compliance within the text provided. However, under the broader framework of the Civil Aviation Regulations, non-compliance with airworthiness directives can lead to enforcement actions, including fines and potential grounding of the aircraft. The severity of penalties can vary, but they are designed to ensure that all aircraft maintain the required safety standards to protect the travelling public and aviation personnel.