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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 (August 25, 2011 Revision)</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 ==
== 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 July 2013):<ref>{{cite web |url=http://www.aeronav.faa.gov/index.asp?xml=aeronav/applications/d_tpp |title=digital – Terminal Procedures Publication (d-TPP)/Airport Diagrams |publisher=[[Federal Aviation Administration|FAA]] |accessdate=2011-06-14}}</ref><ref name=IFPPP>{{cite web |url=http://avnweb.jccbi.gov/schedule/production |title=Instrument Flight Procedures (IFP) Production Plan |publisher=[[FAA]] |accessdate=2013-07-06}}</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>
# KAAS, SDF RWY 23, [[Taylor County Airport (Kentucky)|Taylor County Airport]], Campbellsville, KY (out of service,<ref>Per [[NOTAM]] "!LOU 11/134", which is active since 2009-11-18 "until further notice" (as of 2013-07-06)</ref> awaiting cancellation on 2013-08-22<ref name=IFPPP />)
# KGLW, SDF RWY 07, [[Glasgow Municipal Airport]], Glasgow, KY (out of service<ref>Per [[NOTAM]] "!LOU 06/179", which is active since 2012-06-21 "until further notice" (as of 2013-07-06)</ref>)
# KLBO, SDF RWY 36, [[Floyd W. Jones Lebanon Airport]], Lebanon, MO
# KPOF, SDF RWY 36, [[Poplar Bluff Municipal Airport]], Poplar Bluff, MO (decommissioned<ref>Per [[NOTAM]] "!POF 04/002", which is active since 2013-04-08 "until further notice" (as of 2013-07-06)</ref>)
# KFYM, SDF RWY 20, [[Fayetteville Municipal Airport (Tennessee)|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<ref>Per [[NOTAM]] "!BNA 05/300", which is active since 2008-05-24 "until further notice" (as of 2013-07-06)</ref>)
# KMFI, SDF RWY 34, [[Marshfield Municipal Airport (Wisconsin)|Marshfield Municipal Airport]], Marshfield, WI
# KSUE, SDF RWY 02, [[Door County Cherryland Airport]], Sturgeon Bay, WI
# KISW, SDF RWY 02, [[South Wood County Airport|Alexander Field–South Wood County Airport]], Wisconsin Rapids, WI


== See also ==
== See also ==
<!-- Please respect alphabetical order -->
* [[Instrument approach]]
* [[Instrument approach]]
* [[Instrument landing system]]
* [[Instrument landing system]]
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== References ==
== 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]]
* [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]
* [https://pilotweb.nas.faa.gov/PilotWeb/ FAA NOTAM website]
⚫
{{Reflist}}


[[Category:Aircraft landing systems]]
[[Category:Aircraft landing systems]]



{{Aviation-stub}}
{{Aviation-stub}}

Latest revision as of 15:35, 11 December 2024

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

[edit]

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

See also

[edit]

References

[edit]
  1. ^ a b c 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.
[edit]


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