Re: India:747/Tu154 collision +TCAS

Date:         15 Nov 96 12:25:36 
From:         s_odle@earthlink.net (Scott Odle)
Organization: Earthlink Network, Inc.
References:   1 2 3
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In article <airliners.1996.2399@ohare.Chicago.COM>, gerhard@onramp.net says...

>With a MODE C Xpndr on the other aircraft only a Traffic Advisory (TA)
>would be issued. To get a Resolution Advisory (RA) the other aircraft
>would have to have a MODE S Xpndr.

Not True.

RAs are generated against both Mode C and Mode S targets. The biggest
difference between the two as far as TCAS is concerned is that if both aircraft
have TCAS, they both also have Mode S and therefore TCAS-to-TCAS coordination
between the two aircraft will occur which provides complimentary manuevers to
each aircraft. For example, while one gets a climb RA the other will get a
descend RA.