When two aircraft are converging head-on, what is the required action for both aircraft?

When two aircraft are converging head-on, the proper action is for both to alter their heading to the right. This maneuver is essential for ensuring safety and preventing a mid-air collision. According to aviation regulations, specifically the rules of the air, when two aircraft are approaching each other at an angle that could lead to a collision, they are required to take specific actions to avoid conflict.

In this situation, by turning to the right, both aircraft create a clear path that minimizes the risk of collision. This rule establishes a standard procedure among pilots, ensuring that there is consistency in how aircraft respond during such encounters, which is crucial for maintaining safety in the airspace.

The other options do not align with established aviation rules. Maintaining their current heading could lead to a collision since both aircraft would be on a collision course. Likewise, one aircraft ascending while the other descends does not provide a clear solution for avoiding a head-on collision. Altering their heading to the left is also contrary to the established procedure, which focuses on right turns to facilitate safe navigation and separation.