Simplified directional facility
Simplified directional facility (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 May 2016):[2][3]
- KLBO, SDF RWY 36, Floyd W. Jones Lebanon Airport, Lebanon, MO
- KFYM, SDF RWY 20, Fayetteville Municipal Airport, Fayetteville, TN (out of service[4])
- KMOR, SDF RWY 05, Moore–Murrell Airport, Morristown, TN
- KMFI, SDF RWY 34, Marshfield Municipal Airport, Marshfield, WI (out of service[5])
- KISW, SDF RWY 02, Alexander Field–South Wood County Airport, Wisconsin Rapids, WI
See also
References
- Aeronautical Information Manual (AIM), published in US by Federal Aviation Administration
- FAA NOTAM website
- ↑ 1.0 1.1 1.2 AIM 1-1-10 (March 7, 2013 Revision), accessed 2013-07-06
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- ↑ Per NOTAM "!MKL 04/139 FYM NAV SIMPLIFIED DIRECTIONAL FACILITY RWY 20 OUT OF SERVICE 1504141933-1506052359EST", which was active until 5 June 2015
- ↑ Per NOTAM "!MFI 05/004 MFI NAV SIMPLIFIED DIRECTIONAL FACILITY RWY 34 OUT OF SERVICE 1505191725-1512312111EST"
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