B737 Undifferentiated or Other Model
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 15
Situational Awareness; Communication Breakdown
ATC Issue All Types; 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; Procedure
When the aircraft checked in I descended them to 8000 feet. At the appropriate time I turned them base leg and slowed to 190 knots; vectoring for the Visual Approach. I scanned my other aircraft and then looked back at Aircraft X when I heard the low altitude alert going off. He was at 7000 feet and I was surprised. I should have issued a low altitude alert and climbed him. First thing I thought to do was point out the field and clear him for a visual approach. I told the Supervisor and had Tower issue the brasher. I should have issued the low altitude alert and should have climbed the plane before issuing the Visual Approach clearance.
[Report narrative contained no additional information.]
D01 Controller and 737 Flight Crew reported the aircraft descended from their assigned altitude and flew below the Minimum Vectoring Altitude.