PC-12
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1
Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter CFTT / CFIT
Airspace Structure; Human Factors
I instructed Aircraft X to expect a visual approach and to maintain 12;000 feet. While in an 11;300 MVA (Minimum Vectoring Altitude); I vectored the aircraft to a heading of 270 to follow faster jet traffic from the opposite direction. Several calls followed over the shout line; including multiple coordination's from Center where training was taking place; from the Tower where training was taking place; as well as multiple special requests from various general aviation aircraft in my airspace. Two miles from the boundary with a lower 8;400 feet. MVA I instructed Aircraft X to descend and maintain 9;000 feet.= with the expectation that he would descend slowly and cross the airspace boundary above the 11;300 feet. MVA restriction. Instead; he descended quickly and ended up at 10;900 feet approximately one half mile from the lower MVA boundary. I should have instructed Aircraft X to maintain 12;000 feet or at least 11;300 feet. until crossing the MVA boundary before instructing him to descend. I also should have spoken to the pilot and made him a priority rather than fielding multiple calls from multiple trainees and allowing myself to become distracted from positively controlling the aircraft.
ABQ TRACON Controller reported an aircraft descended at a quicker rate than expected and flew below the Minimum Vectoring Altitude.