[Scan-DC] Re: [MilCom] 10/25 Morning Logs

[Sheldon Daitch]

GCA and PAR will give vertical path guidance to the
approach end of the runway, while ASR gives no
vertical path guidance.  Both provide horizonal path
information, but traditionally, CGA/PAR horizontal
path information is more accurate than that of an ASR.

GCA and PAR radar systems have a vertical path
indicator for the operator to tell the pilot if they are
above or below the glide path to the runway.

ASR gives no vertical path information and the
controller relies on altitude stepdowns performed
by the pilot.

SFA is a procedure where the pilot does not have
to transfer radio frequencies, where the various
controllers have access to a common transmitter
or equipment on a common frequency, relieving
the pilot from having to change radio frequencies
during the various steps of an instrument approach.



domyers at voicenet.com wrote:

>>Question:
>>Does GCA/P (ASR/PAR according to AirNav) stand for Ground-Controlled
>>Approach/Precision Approach Radar? I never did quite understand the
>>acronym.
>>    
>>
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>jay-
>
>GCA= Ground Control Approach
>PAR= Precision Approach Radar
>ASR= Approach Survillence Radar
>SFA= Single Frequency Approach
>
>It's pretty much all the same.  Hope this helps.
>Dan
>Horsham, Pa
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