Difference between PAR and ASR approaches

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05-07-2008, 07:09 PM

Zero1Niner

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Difference between PAR and ASR approaches

Can anyone explain the differences between an 'Airport Surveillance Radar' approach and a 'Precision Approach Radar' approach?

05-07-2008, 08:08 PM

UALDEN

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A PAR includes glideslope guidance, an ASR is a non precision approach with course guidance only. Typical PAR minimums are similar to ILS cat I mins, while an ASR is similar to a VOR or loc only approach.

Mark

05-07-2008, 08:23 PM

Zero1Niner

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So in terms of the pilot and controller interaction, its basically the same, but if the facility is equipt with PAR, they can get you the lower minimums? Am I understanding this correctly?

Thanks

05-07-2008, 08:29 PM

atlmsl

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Yes. Different equipment that offers vetical guidance with the lateral. Interaction is basically the same.

05-07-2008, 09:40 PM

robthree

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In other words a PAR is an ILS, and an ASR is a LOC, only with the controller giving you your guidance instead of the NAV radio.

05-07-2008, 09:43 PM

EvilGN

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NOTE: Military PAR's usually go down to 100 and 1/4 mil vis, not the std Cat I mins, and the controller will inform you of DH, and crossing the threshold

05-07-2008, 10:32 PM

USMCFLYR

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Quote:

Originally Posted by EvilGN

NOTE: Military PAR's usually go down to 100 and 1/4 mil vis, not the std Cat I mins, and the controller will inform you of DH, and crossing the threshold

Except for single piloted, then the mins are 200-1/2.

USMCFLYR

05-08-2008, 12:39 PM

Zero1Niner

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Quote:

Originally Posted by robthree

In other words a PAR is an ILS, and an ASR is a LOC, only with the controller giving you your guidance instead of the NAV radio.

hmm...so how are the descents given by the controller? On a PAR, are you told to descend at a specific rate/min? Or are they just stepping you down, same as they would on a ASR or LOC for that matter?