When given a holding clearance, what is the recommended entry procedure if instructed to hold south on the 180 radial?

When given a holding clearance specifying a hold south on the 180 radial, choosing the teardrop entry procedure is appropriate because it allows for an efficient and effective way to establish yourself in the holding pattern. The teardrop entry is particularly useful in this scenario since it enables the pilot to enter the hold from a heading that allows for a smooth transition into the circular pattern of the hold.

In this flight situation, the teardrop entry involves flying outbound from the holding fix on the 180 radial, making a turn to intercept a heading that is approximately 30 degrees off of the outbound radial, and then proceeding back toward the holding fix to establish the hold. This method benefits from providing a controlled entry into the holding pattern while optimizing airspace management and minimizing the chances of drift, since the holding radial is directly in line with your initial heading.

While the direct and parallel entries can also be used in certain circumstances, they may not be as efficient or suited for the hold south on the 180 radial as the teardrop entry. The teardrop approach is particularly effective when the airspace around the holding fix allows for clear communication, and it helps to maintain separation from other aircraft or obstacles in the vicinity.