Which task is not a responsibility of the General Manager regarding deicing operations?

The responsibility of ensuring that the refractometer is certified as calibrated every 5 years typically falls under the domain of technical staff or specialized personnel within the operations team. The General Manager, while overseeing the overall deicing operations, primarily focuses on strategic functions such as ensuring proper training for personnel, coordinating schedules to optimize deicing efforts, and overseeing compliance with safety regulations. These roles are essential for effective management and operation of deicing practices but do not usually include the specific technical requirement of equipment calibration, which requires specialized knowledge and skills. Therefore, ensuring equipment calibration is more of a task for technical staff trained specifically for those duties, rather than the General Manager's responsibilities.