With reference to Traffic Collision Avoidance Systems, the difference between TCAS I and II is  that:  
a. TCAS II can provide Traffic Advisories and Resolution Advisories whilst TCAS I  can only provide Traffic Advisories  
b. TCAS II can only be fitted to large aircrafts which carry more than 30 passengers.  While TCAS I can be fitted to any aircraft.  
c. TCAS I can be fitted aircrafts which carry transponders with Mode A only while TCAS  II can be fitted to aircrafts whose transponders include either Mode C or Mode S.  d. TCAS II can only be to aircraft which are equipped with EFIS

1 Answer

Answer :

a. TCAS II can provide Traffic Advisories and Resolution Advisories whilst TCAS I  can only provide Traffic Advisories

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