When, other than during an emergency, may a Technician class licensee be the control operator of a station operating in an Amateur Extra Class band segment?

FCC rules dictate that a control operator may only operate within the privileges granted by their specific license class. Consequently, a Technician class licensee cannot act as the control operator on Amateur Extra class frequencies under normal circumstances. Operating at an Extra class licensee's house, using a club station with an Extra class trustee, or participating in a contest does not temporarily upgrade your privileges. To operate in an Extra segment, an actual Extra class licensee must be designated as the control operator.