A class A and B mishap requires preliminary messages to be sent within how many hours of the on-duty mishap?

In cases of Class A and B mishaps, it is crucial to ensure timely communication regarding the incident. The regulation mandates that preliminary messages be sent within 24 hours of the incident occurring. This timeframe allows for immediate reporting of the essential details while ensuring that the information is still fresh and accurate. Such timely communication is critical for effective response efforts, investigations, and coordination among different parties involved in the mishap. The 24-hour window serves to balance the need for quick communication with the requirement for precise reporting, making it a standard procedure in mishap response protocols.