Final answer:
The question is about the initiation of a planned three engine go-around, but without further context or information, the specific timing cannot be determined.
Step-by-step explanation:
In the given context, the question is asking about the initiation of a planned three engine go-around. A go-around is a procedure in aviation where the pilot aborts the landing and initiates a climb to perform another approach and landing. In this case, the student wants to know when the three engine go-around should be started. Without further context or information, it is not possible to determine the specific timing for the initiation of the go-around.