Final answer:
Nose gear extension during alternate gear extension is assisted by downlock assist springs and airflow, which ensure safe landing gear deployment in case of primary system failure.
Step-by-step explanation:
During alternate gear extension, nose gear extension is typically assisted by downlock assist springs and airflow. The downlock assist springs help to initiate the extension of the landing gear once the downlock is released, while the airflow provides additional force to fully extend and lock the gear into place. This system is designed to ensure that the aircraft can still safely lower its nose gear for landing in the event that the primary systems, such as hydraulics, fail.