What is the primary function of the service bulletin as it relates to engine compliance?

The primary function of a service bulletin is to ensure safety and airworthiness. Service bulletins are issued by manufacturers to provide important information regarding the maintenance, potential issues, or modifications related to their products, including engines. These documents often address concerns that may affect the safe operation of an engine or an aircraft system, such as necessary inspections, modifications, or corrective actions. By adhering to these bulletins, operators can mitigate risks and maintain compliance with regulatory safety standards, thereby ensuring that the aircraft remains safe to operate and meets airworthiness requirements. This commitment to safety is critical in the aviation industry, as it helps prevent incidents and accidents related to maintenance issues or technical failures.