Simplified directional facility: Difference between revisions

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Simplified directional facility (SDF) was a localizer-based instrument non-precision approach to an airport, which provided final approach course similar to instrument landing system (ILS) and localizer type directional aid (LDA) approaches, although not as precise.

The SDF signal was fixed at either 6 or 12 degrees, as necessary to provide maximum flyability and optimum course quality.^[1] Unlike an ILS, an SDF did 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

As of November, 2025, the last SDR approach at KMOR was permanently decommissioned. ^[2]^[3]

References

^ ^a ^b ^c AIM 1-1-10 (March 7, 2013 Revision), accessed 2013-07-06
^ "digital – Terminal Procedures Publication (d-TPP)/Airport Diagrams". FAA. Retrieved 2024-11-13.
^ "Instrument Flight Procedures Information Gateway". FAA. Retrieved 2017-06-23.

External links

Aeronautical Information Manual (AIM), published in US by Federal Aviation Administration
FAA NOTAM website

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[AIM_1-1-10-1] AIM 1-1-10 (March 7, 2013 Revision), accessed 2013-07-06

[2] "digital – Terminal Procedures Publication (d-TPP)/Airport Diagrams". FAA. Retrieved 2024-11-13.

[3] "Instrument Flight Procedures Information Gateway". FAA. Retrieved 2017-06-23.

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+{{short description|Aircraft approach}}
-'''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.
+'''Simplified directional facility (SDF)''' was a [[localizer]]-based instrument [[non-precision approach]] to an airport, which provided [[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.<ref name="AIM 1-1-10">AIM 1-1-10 (March 7, 2013 Revision), accessed 2013-07-06</ref> Unlike an ILS, an SDF does not provide vertical guidance in the form of a [[glideslope]].<ref name="AIM 1-1-10"/> 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.<ref name="AIM 1-1-10"/>
+The SDF signal was fixed at either 6 or 12 degrees, as necessary to provide maximum flyability and optimum course quality.<ref name="AIM 1-1-10">AIM 1-1-10 (March 7, 2013 Revision), accessed 2013-07-06</ref> Unlike an ILS, an SDF did not provide vertical guidance in the form of a [[glideslope]].<ref name="AIM 1-1-10"/> 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.<ref name="AIM 1-1-10"/>
 == Current SDF approaches in the United States ==
+As of November, 2025, the last SDR approach at [[Morristown Regional Airport|KMOR]] was permanently decommissioned.
-The following SDF approaches are published in the United States (as of June 2016):<ref>{{cite web |url=http://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dtpp/ |title=digital – Terminal Procedures Publication (d-TPP)/Airport Diagrams |publisher=[[Federal Aviation Administration|FAA]] |accessdate=2016-06-06}}</ref><ref>{{cite web |url=https://www.faa.gov/air_traffic/flight_info/aeronav/procedures/ |title=Instrument Flight Procedures Information Gateway |publisher=[[Federal Aviation Administration|FAA]] |accessdate=2016-06-06}}</ref>
+<ref>{{cite web |url=http://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/dtpp/ |title=digital – Terminal Procedures Publication (d-TPP)/Airport Diagrams |publisher=[[Federal Aviation Administration|FAA]] |accessdate=2024-11-13}}</ref><ref>{{cite web |url=https://www.faa.gov/air_traffic/flight_info/aeronav/procedures/ |title=Instrument Flight Procedures Information Gateway |publisher=[[Federal Aviation Administration|FAA]] |accessdate=2017-06-23}}</ref>
-# KLBO, SDF RWY 36, [[Floyd W. Jones Lebanon Airport]], Lebanon, MO, scheduled for decommissioning at end of 2016
-# KMOR, SDF RWY 05, [[Moore–Murrell Airport]], Morristown, TN
-# KMFI, SDF RWY 34, [[Marshfield Municipal Airport (Wisconsin)|Marshfield Municipal Airport]], Marshfield, WI
-# KISW, SDF RWY 02, [[South Wood County Airport|Alexander Field–South Wood County Airport]], Wisconsin Rapids, WI
 == See also ==
+<!-- Please respect alphabetical order -->
 * [[Instrument approach]]
 * [[Instrument landing system]]
@@ Line 17: / Line 15: @@
 == References ==
+{{Reflist}}
+==External links==
 * [http://www.faa.gov/air_traffic/publications/ATpubs/AIM/index.htm Aeronautical Information Manual (AIM)], published in US by [[Federal Aviation Administration]]
 * [https://pilotweb.nas.faa.gov/PilotWeb/ FAA NOTAM website]
-{{Reflist}}
 [[Category:Aircraft landing systems]]
 {{Aviation-stub}}