PA-23-250 Aztec
Air Traffic Control Fully Certified; Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Commercial
Air Traffic Control Non Radar 5; Air Traffic Control Radar 5; Flight Crew Last 90 Days 60; Flight Crew Total 760; Flight Crew Type 70
Time Pressure; Situational Awareness; Communication Breakdown
ATC Issue All Types; Conflict NMAC
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Human Factors
I was doing north and south survey lines about 14 miles north of ZZZ at 4;800 feet. Approach told me traffic Cirrus 5 o'clock NW bound at 4;400 feet and I acknowledged it to ATC. Then; ATC told the Cirrus traffic 12 o'clock at 4;900 feet. The Cirrus pilot said that he was close to me and at almost same altitude; so he said that he's going to make a sharp right turn. After few seconds; he flew right under me at [around] 50-200 feet below me. I didn't see the Cirrus till he passed under me but the Cirrus pilot maneuvered well to avoid me. I think the Cirrus' transponder was little off than it's supposed to be because he was not at 4;400 [feet]. ATC should've informed us little earlier because the whole thing happened within 2 minutes of acknowledgment.
Piper Aztec (PA27) pilot reported a NMAC with previously reported traffic by ATC.