Collision Avoidance Systems
            
                
                
            
            
                | (a) Turbine-powered airplane of more than 33,000 pounds maximum certificated takeoff weight | 
                (1) An appropriate class of Mode S transponder that meets Technical Standard Order (TSO) C-112, or a later version, and one of the following approved units:(i) TCAS II that meets TSO C-119b (version 7.0), or a later version.
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                (ii) TCAS II that meets TSO C-119a (version 6.04A Enhanced) that was installed in that airplane before May 1, 2003. If that TCAS II version 6.04A Enhanced no longer can be repaired to TSO C-119a standards, it must be replaced with a TCAS II that meets TSO C-119b (version 7.0), or a later version.(iii) A collision avoidance system equivalent to TSO C-119b (version 7.0), or a later version, capable of coordinating with units that meet TSO C-119a (version 6.04A Enhanced), or a later version.
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                | (b) Piston-powered airplane of more than 33,000 pounds maximum certificated takeoff weight | 
                (1) TCAS I that meets TSO C-118, or a later version, or(2) A collision avoidance system equivalent to TSO C-118, or a later version, or
                    (1)(3) A collision avoidance system and Mode S transponder that meet paragraph (a)(1) of this section.
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