Final answer:
The question pertains to identifying aircraft with primary radar, highlighting that 'IDENT' is not a method used in primary radar identification as it requires a transponder, thus being excluded from the list of methods.
Step-by-step explanation:
The question addresses methods of identifying aircraft using primary radar when the aircraft is either not equipped with a transponder or when the transponder is inoperative. It is crucial to differentiate between primary and secondary radar methods. Primary radar involves sending microwaves that reflect off surfaces to determine the location of an object. Secondary radar relies on a transponder signal from the aircraft. The indicated methods of identifying an aircraft with primary radar include observing the aircraft departing an airport, requesting the aircraft to report its position over a known point, and instructing the aircraft to change heading and observing the radar for the turn. The option 'IDENT' generally consists of an aircraft using its transponder to send a unique signal to the radar operator, which would not be applicable in the context of primary radar identification, because it requires a functioning transponder.