AD/CESSNA 340/11 Amdt 1 - Wing Tip Strobe Light - Inspection

Overview

The Civil Aviation Regulations 1998, enacted by the Australian Government, establish the framework for ensuring the safety of civil aviation. This legislation is overseen by the Civil Aviation Safety Authority (CASA), which administers and enforces the regulations to maintain high safety standards within the aviation industry. One specific area addressed by these regulations is the safety of aircraft equipment, as seen in Part 39 - 105, which includes Airworthiness Directives for various aircraft types. These directives are designed to address and rectify safety issues that may compromise the airworthiness of an aircraft. The policy objective is to ensure that all civil aircraft meet stringent safety standards, thereby protecting the public and maintaining the integrity of the aviation system. One example of such a directive is AD/CESSNA 340/11, which pertains to the inspection and deactivation of wing tip strobe lights on Cessna 340 series aeroplanes. This directive was introduced to address a specific safety concern related to the potential for fuel tank explosions caused by faulty strobe lights. The directive applies to a particular range of serial numbers of Cessna 340 aeroplanes and mandates deactivation of the strobe light system unless specific approved cover plates are installed. The objective is to ensure that these aircraft can operate safely without the risk of such hazardous incidents, thereby enhancing overall aviation safety.

Scope and Application

The Civil Aviation Regulations 1998, specifically Part 39 - 105 and the Civil Aviation Safety Authority Schedule of Airworthiness Directives, apply to all Cessna 340 series aeroplanes with serial numbers ranging from 340-0001 to 340-0551, which are equipped with strobe lights installed in the wing tip fuel tank nose cap. This directive excludes aeroplanes with specific strobe light models, including Symbolic displays P/N 30-0005, 30-0199-3, and 701133-1; Whelen Engineering Co. Inc. P/N A430; and Grimes Manufacturing Co. P/N 30-0515-5, 30-1172-1, 30-0531-1, and 30-0467-5 strobe lights. The requirement of the directive mandates the deactivation of the strobe light system through various means, such as installing a guard over the switch, pulling and locking the circuit breaker, or using any other suitable method. Additionally, systems with Grimes P/N 30-0515-1 strobe lights can be reactivated upon the installation of Grimes P/N 31-1723-5 or 30-1171-1 cover plates, identifiable by two quench tubes protruding into the light assembly from the end plate, in accordance with Cessna SL ME75-16. Other non-excepted strobe light assemblies must not be reactivated until data proving their explosion-proof nature is submitted to and approved by the Secretary. Compliance with these regulations must be achieved within 100 hours of time in service after 30 July 1976.

Key Provisions

The Civil Aviation Regulations 1998, specifically Part 39, Section 105, mandates the application of airworthiness directives, such as AD/CESSNA 340/11 Amendment 1, which concerns the inspection of wing tip strobe lights on certain Cessna 340 series aeroplanes. This regulation applies to all models with serial numbers between 340-0001 and 340-0551, except for those equipped with specific strobe light part numbers or models (Section 39.105). The directive requires that these aircraft must deactivate their wing tip strobe light systems by installing a guard over the switch, pulling and locking the circuit breaker, or using any other suitable method to prevent inadvertent reset (Section 39.105.1). For systems with Grimes P/N 30-0515-1 strobe lights, reactivation is possible after installing Grimes P/N 31-1723-5 or 30-1171-1 cover plates, identifiable by two quench tubes protruding into the light assembly from the end plate (Section 39.105.2). All other strobe light assemblies must remain deactivated until approved by the Secretary, pending evidence that they are explosion-proof (Section 39.105.3). The obligations under this directive are clear and specific, demanding that aircraft operators and owners ensure compliance with the stipulated measures to deactivate the strobe lights. The compliance must be achieved within 100 hours of time in service after 30 July 1976, as outlined in the regulations (Section 39.105). Operators must undertake the necessary actions to safeguard against any potential ignition sources that could lead to an explosion. This includes installing guards, locking circuit breakers, or other methods that effectively deactivate the strobe lights. For specific Grimes strobe lights, the installation of cover plates is required to allow reactivation, ensuring that these systems meet the safety standards set forth by the Secretary. Failure to comply with the airworthiness directive may result in serious consequences. The Civil Aviation Regulations 1998 impose penalties for non-compliance, although the exact penalties are not specified within the directive itself. However, the overarching regulatory framework of the Civil Aviation Act 1988 provides for both civil and criminal penalties for violations of safety regulations. These penalties may include fines, imprisonment, or both, depending on the severity and impact of the breach. Operators who fail to deactivate their strobe lights as required risk not only the safety of their aircraft but also potential legal repercussions under the broader aviation safety laws.