Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 0.5
Distraction; Situational Awareness; Workload
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued New Clearance
Airspace Structure; Human Factors; Procedure; Staffing
I was working north; south sector combined as a Tower Radar; as well as Controller in Charge for the Tower. There was a Cessna doing survey work 7 to 9 miles off the departure end of the runway at 3;200 feet; coordinated with the Local Control. I turned Aircraft X to a northwest heading and gave a descent to 2;500 feet as it was the MVA (Minimum Vectoring Altitude) around the airport. My plan was to turn him to a 270 heading for his base turn to 1;300 feet before the MVA in front of him which was 2;800 feet. I used the shout line to talk to the adjacent Approach to make sure they knew I had called traffic for Aircraft Y who was VFR still in my airspace and didn't have the other VFR traffic in sight and was becoming more of a conflict than originally thought. I then was called by a Departure that needed a turn as to not be a conflict with the survey Cessna. As I finished my scan; I saw Aircraft X was entering the MVA of 2;800 feet at 2;800 feet and still in his descent. I told Aircraft X to maintain 3;000 [feet]. The pilot said they were below that; leveling off at 2;500 feet. I then told the aircraft to climb to 3;000 feet. The aircraft was never in danger of hitting the antenna that was at 1;800 feet. Having a Supervisor in the operation may have helped the operation as it would have been an extra pair of eyes. Next time; I will descend to 3;000 feet in case my attention is brought elsewhere.
A Tower Controller working Approach from the Tower Radar became distracted and descended an aircraft below the Minimum Vectoring Altitude.