Which squawk code indicates an aircraft is low on fuel and requires immediate assistance?

Squawk code 71 is specifically designated for an aircraft that is low on fuel and requires immediate assistance. This code is part of a set of transponder squawk codes used in aviation to communicate specific situations or emergencies. When air traffic control receives a transponder signal indicating squawk 71, it alerts them to prioritize the aircraft's needs, directing attention and resources to ensure a safe landing or to provide necessary assistance.

The other squawk codes do not convey this critical situation. For instance, they may be designated for routine operations or other types of emergencies that do not indicate an urgent need for immediate action due to low fuel. Understanding these squawk codes is essential for effective communication between pilots and air traffic control, particularly in emergency situations where prompt response is crucial for safety.