What is a Stepdown fix?

• A. A fix used to initialize inertial navigation system.
• B. A waypoint where full engine power is required.
• C. The point after which additional descent is permitted within a segment of an IAP.
• D. A location to perform a level turn.

Answer: (C)

A stepdown fix marks a point along an instrument approach where you are allowed to descend to a lower altitude within the approach segment. It’s published to ensure you descend in controlled, defined steps while still maintaining obstacle clearance. You don’t descend below the published altitude before you cross the stepdown fix; once you pass it, you may descend to the next lower altitude until you reach the next fix or altitude constraint. This helps manage the risk of descent as you move toward the runway, especially in areas with terrain or obstacles.

So, the stepdown fix is the point after which additional descent is permitted within that segment of the instrument approach. It’s not related to initializing navigation systems, not a cue for full engine power, and not just a place to perform a level turn.