Small Aircraft
Flight Crew Commercial
Situational Awareness; Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Procedure; Human Factors
During maneuvers in practice area; we were practicing stalls going from south to north. The practice area frequency was monitored and all our radio calls were made for location; direction of flight; altitude; and maneuver type. No conflict was identified from other aircraft. Upon completion of the stall; we got a traffic alert for an aircraft traveling northwest to southeast at our 11 o'clock 500 feet above us. They didn't make any radio calls before; during; or after the event. I took the flight controls and performed a 180-degree descending turn to south; 1000 feet below our altitude. This solved the traffic conflict.The traffic crossed through the practice area and wasn't on our frequency as far as we could tell. I should have maintained more vigilant attention to traffic de-conflicting; both visually and with the ADS-B. Going forward I will double-check for traffic with a visual scan and verify with the ADS-B. Even if traffic is clear to begin a maneuver; it may be a conflict by its completion. If a similar situation arises in the future; I will adjust heading and altitude prior to starting the maneuver.
Flight instructor reported another aircraft in the training area provided no radio communication throughout the event as the other aircraft passed 500 feet overhead resulting in an NMAC and triggering a traffic alert.