Simplified Directional Facility
Simplified Directional Facility or SDF is a localizer-based instrument non-precision approach to an airport, which provides final approach course similar to Instrument Landing System (ILS) and Localizer Type Directional Aid (LDA) approaches, although not as precise.
The SDF signal is fixed at either 6 or 12 degrees, as necessary to provide maximum flyability and optimum course quality.[1] Unlike an ILS, an SDF does not provide vertical guidance in the form of a glideslope.[1] The SDF course may or may not be aligned with the runway because its antenna may be offset from the runway centerline. Usable off-course indications are limited to 35 degrees either side of the course centerline.[1]
Current SDF approaches in the United States
The following SDF approaches are published in the United States (as of June 2011):[2]
- KAAS, SDF RWY 23, Taylor County Airport, Campbellsville, KY (out of service[3])
- KGLW, SDF RWY 07, Glasgow Municipal Airport, Glasgow, KY (out of service[4])
- KLBO, SDF RWY 36, Floyd W. Jones Lebanon Airport, Lebanon, MO
- KPOF, SDF RWY 36, Poplar Bluff Municipal Airport, Poplar Bluff, MO
- KFYM, SDF RWY 20, Fayetteville Municipal Airport, Fayetteville, TN
- KMOR, SDF RWY 05, Moore-Murrell Airport, Morristown, TN
- KSCX, SDF RWY 23, Scott Municipal Airport, Oneida, TN (out of service[5])
- KTHA, SDF RWY 18, Tullahoma Regional Airport/William Northern Field, Tullahoma, TN
- KMFI, SDF RWY 34, Marshfield Municipal Airport, Marshfield, WI
- KSUE, SDF RWY 02, Door County Cherryland Airport, Sturgeon Bay, WI
- KISW, SDF RWY 02, Alexander Field–South Wood County Airport, Wisconsin Rapids, WI
See also
References