How can you determine if another aircraft is on a collision course with your aircraft?

Determining if another aircraft is on a collision course involves observing relative motion. The correct indication of a collision course is that there is no apparent relative motion between your aircraft and the other aircraft. This means that from your perspective, the other aircraft appears to maintain a steady position in the same field of view, suggesting that it is not moving closer or further away—indicating a potential collision.

When both aircraft are on a collision course, you won't notice significant changes in the distance or angular position of the other aircraft relative to your own. If it seems to remain in the same spot, it could suggest that both aircraft are on a direct path toward each other.

Other options describe scenarios that don't accurately confirm a collision course. For instance, if the other aircraft appears to get larger and closer at a rapid rate, it typically indicates that they are approaching, but not necessarily that they are on a collision course. Similarly, if both aircraft's noses are pointed at the same point in space, it reflects a general alignment but does not confirm a collision course without considering the trajectories. Seeing both aircraft in the same vertical plane can indicate proximity but does not confirm their relative paths.