Tacan

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Piston52Heavy

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Last night I was listening to some F-16s returning to Selfridge. They were cleared the TACAN to runway 01. How does a TACAN approach differ from an ILS? I know the ILS consists of the localizer and the glideslope.
 

N9PBD

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A TACAN is a military only navagational aid that provides azimuth (radial) and range information (called DME or distance measuring equipment.) It is a non-precision aid, where an ILS provides precision azimuth (course), elevation or glidepath, and sometimes range (DME).

An ILS system can be certified to provide precision landing guidance in near zero-zero weather.

A TACAN can also be used in air-to-air mode, like when fighter aircraft need to locate a refueling tanker. The tanker can be a TACAN station for them to home in on.

You can equate a TACAN to the civilian VOR navaid. In fact, many TACAN and VOR stations are colocated, and are called VORTACs in that case. The benefit of a VORTAC to a civilian pilot is that they can use the DME feature of the TACAN to give them their distance from the station.

I hope I didn't confuse the subject too much.

73, Greg
 
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