Final answer:
Option C is incorrect as it is the pilot's responsibility to set the transponder to emergency codes, not a method used by facilities to assist lost or overdue aircraft.
Step-by-step explanation:
The question refers to the procedures for assisting lost and overdue aircraft and asks which option does NOT outline how these aircraft are assisted. Looking at the provided options, the incorrect statement is option C: The aircraft's transponder code is changed to 7500 (hijack) or 7600 (communication failure) as a signal for assistance. In reality, it is the pilot's responsibility to set the transponder to these codes if specific emergency situations occur, not as a general signal for assistance when an aircraft is lost or overdue. Option A refers to sending a QALQ message to facilities, option B involves alerting search and rescue agencies like the Civil Air Patrol (CAP), and option D describes initiating a search and rescue (SAR) mission, all of which are accurate methods for assisting aircraft.