Small Aircraft; Low Wing; 2 Eng; Retractable Gear
Air Traffic Control Fully Certified
Communication Breakdown; Situational Awareness
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented
Human Factors; Airspace Structure; Chart Or Publication
Aircraft X was inbound to MOR airport at 7000 feet. As he entered my airspace at 7000 feet he was in a Minimum Vectoring Altitude at 5000 feet. I descended him to 5000 feet and he read back 5000 feet. By the time I noticed he had descended to 4100 feet at which time I re-emphasized 5000 feet. He made corrective actions to return to 5000 feet. I don't have any specific recommendations for occurrences like these. Perhaps the pilots could use more automation to ensure they do not continue a descent through an assigned altitude. Perhaps (different than our current low altitude alert) STARS could have some function where an IFR aircraft data block could turn red or yellow when beneath a Minimum Vectoring Altitude.
TYS TRACON Controller reported an aircraft descended below the assigned altitude and below the Minimum Vectoring Altitude.