If a glider and an airplane are on a head-on collision course, what should they both do?

In a head-on collision situation, the proper course of action is for both aircraft to give way to the right. This rule is part of the general aviation regulations and is designed to ensure that both pilots can ensure their safety while avoiding a collision.

When two aircraft are on a collision course, the 'rule of right' applies, which states that each pilot should alter their direction to the right to facilitate a safe passing. This approach is universally taught and practiced to reduce confusion in navigation and enhance safety during flight operations.

In this context, the airplane and the glider need to recognize their positions and adjust accordingly, allowing for a clear and predictable change in course. The other options do not follow the established rules of the air regarding right of way and would not effectively resolve the potential collision. For instance, having both aircraft ascend or descend may not effectively prevent a collision and could lead to further complications. Thus, the most sensible and standardized action in this situation is for both to give way to the right.