Re: India:747/Tu154 collision +TCAS

Date:         17 Nov 96 20:04:01 
From:         s_odle@earthlink.net (Scott Odle)
Organization: Earthlink Network, Inc.
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In article <airliners.1996.2410@ohare.Chicago.COM>, Francis.Jambon@imag.fr
says...

>TCAS-I (for small airplanes): The TCAS-I can show the position of the
>other aircraft. If the other aircraft have a mode C transponder (instead
>of a mode A) the TCAS-I also show altitude. I don't think that the TCAS
>equiped airplanes absolutely need a working transponder (except for
>altitude comparison), but they usualy have one.

TCAS will not operate without a working transponder onboard or without the
altitude encoding on.

>For the TCAS-II (for airliners): The other airplane need a mode S
>transponder. So the TCAS-II can generate traffic warnings (TA) and
>resolution requests (RA) to avoid collision in the vertical plan only. If
>both airplanes have a mode S transponder, the manoeuvering of the two
>airplanes are coordinates.

TCAS II does not require both aircraft to have Mode S. The intruder aircraft
must only have Mode C.

>For the TCAS-III (in project) : The TCAS can generate manoeuvering in both
>vertical and horizontal plan.

There will be no TCAS III.  For whatever reason it will be designated TCAS IV.