Which term refers to the main function of an interrogator in flight operations?

The term that refers to the main function of an interrogator in flight operations is identifying friendly aircraft. An interrogator serves a crucial role in distinguishing between friendly and potentially hostile or unknown aircraft within a specific airspace. This identification process is typically achieved through the use of transponders that respond to interrogation signals generated by radar systems. These responses include data such as the aircraft's identification code, altitude, and possibly other information necessary for air traffic control and situational awareness.

While transmitting data and receiving signals are important functions involved in the overall operation of an interrogator, they are secondary to the primary goal, which is to facilitate identification. Monitoring airspace is also a critical function performed by air traffic control systems but does not directly encapsulate the unique role of an interrogator in identifying friendly aircraft amid the complexities of flight operations. Thus, the identification of friendly aircraft stands out as the primary function that defines the interrogator’s role in enhancing air safety and operational efficiency.