From: (Brian A. Reynolds)
Organization: Rockwell Avionics - Collins, Cedar Rapids, IA
Date:         15 Feb 95 03:42:22 
References:   1
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TCAS II is covered by TSO-C119a(TCAS-I by TSO-C118).  To obtain a copy
of a TSO write to the:
	Department of Transportation Personal Property Operations Branch,
        General Services Section, M-443.2, 
	Washington DC, 20590.  

This will most likely point you to an RTCA Document however.  DO-197,
Active Traffic Alert and Collision Avoidance System I (C118) is
available from:
	RTCA, Inc.
	1140 Connecticut Avenue, N.W. Suite 1020
	Washington, D.C. 20036 USA

	Phone 202-833-9339

I think that RTCA would be a better place to start with, although it
is the TSO which makes the RTCA document a 'standard.'