The SDF instrument approach is the rarest approach in the USA, with only one example remaining in Morristown, TN. Do you know how to fly it? //

A Simplified Directional Facility Approach (SDF) provides a final approach course similar to a localizer, but with a few distinct differences. //

In 2018, the SDF to RWY 34 at the Marshfield Municipal Airport, Marshfield, WI (KMFI) was decommissioned. This leaves just ONE SDF approach left in the USA, the SDF to Runway 05 at the Moore-Murrell Airport (KMOR), Morristown, Tennessee.