Pilots reported communication and traffic separation issues occurred with another aircraft twice; with the last event resulting in a NMAC.
Synopsis
Pilots reported communication and traffic separation issues occurred with another aircraft twice; with the last event resulting in a NMAC.
Narrative
At XA:25; Aircraft X was approaching to land into ZZZ and doing constant standard advisory calls over the UNICOM. On a straight in 8 mile final for runway XX into ZZZ; a locally hangared Aircraft Y reported to be waiting on the ramp to continue to do VFR pattern work at ZZZ. Upon landing; Aircraft X was still on the active runway of Runway XX and Aircraft Y began to back taxi on the same runway before Aircraft X reported cleared.At XA:55; Continuing out of ZZZ as Aircraft X; Aircraft X was holding short of Taxiway XX and Runway XX. Aircraft Y has just landed and was on the active runway. Aircraft Y advised a suggestion to remain on the runway and told Aircraft X to back taxi onto the active runway. Aircraft X refused and remained to hold short until Aircraft Y was completely cleared. After Aircraft Y fully cleared; Aircraft X continued to back taxi and performed a standard takeoff. On the climb; Aircraft X remained on the UNICOM frequency to track Aircraft Y's intentions. Aircraft Y did not communicate his takeoff. It was only until Aircraft X noticed the traffic target approaching quickly on the ADSB from the rear. The PIC diverted away from Aircraft Y as a preventative measure. To explain how close the aircraft came; banking away from Aircraft Y; PIC of Aircraft X can see Aircraft Y's pilot clearly through their cockpit glass. ZZZ Center also reported a traffic warning with haste and is aware of the situation.
Second reporter narrative
[Report narrative contained no additional information.]
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.