What is the automatic landing altitude return-to-base criteria?

The correct answer regarding the automatic landing altitude return-to-base criteria is based on established aviation protocols designed to ensure safety and effective operation during flight. In this context, the criteria specify that if an aircraft is at or above an altitude of 6000 feet, it should have adequate time—up to 10 minutes—before a return to the base is necessary. This provides a sufficient margin for pilots to assess the situation, make informed decisions, and execute a safe approach and landing.

This altitude and time allocation takes into consideration various factors such as aircraft performance, prevailing weather conditions, and potential emergency scenarios. By having a threshold of 6000 feet and a timeframe of 10 minutes, pilots can manage the return effectively while ensuring the safety of passengers and crew.

The other options do not meet the common safety standards and protocols that prioritize operational safety and decision-making time in aviation.