Skyhawk 172/Cutlass 172
Flight Crew Instrument; Flight Crew Private
Flight Crew Last 90 Days 12; Flight Crew Total 1350; Flight Crew Type 700
Situational Awareness
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors
I was cruising eastbound; just south of 39N; at 2;800 ft. I watched on ADS as [a Mooney] departed Runway 28 at 39N and entered a climbing left turn. The aircraft was behind me; and much faster than my C172. The plane leveled at 2;800 ft; headed directly toward me and a mile behind me. At that moment; NY Center said 'traffic six o'clock; same direction and altitude; fast-moving.' I performed a chandelle to get out of the way of the other aircraft; which never changed course; altitude or speed. I have ADS-B OUT and IN; and it has been verified. Since the other aircraft obviously had ADS-B OUT; I assume it had the IN function as well. There was no way I would have avoided a collision; even with ATC warning; if I did not see for myself how immediate the threat was. I can easily believe that a plane overtaking a 172 from behind would have very little cross-section to see visually; but how did they not glance at their own ADS-B? I'm really puzzled. If we buy these things and don't use them; what's the purpose of having them?
C172 reported taking evasive action to avoid a midair collision departing 39N airport.