Abq TRACON controller reported an aircraft descended at a quicker rate than expected and flew below ...

Narrative:

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.

Original NASA ASRS Text

Title: ABQ TRACON Controller reported an aircraft descended at a quicker rate than expected and flew below the Minimum Vectoring Altitude.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1663562
Time
Date	201907
Local Time Of Day	1201-1800
Place
Locale Reference	ABQ.TRACON
State Reference	NM
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	PC-12
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 1
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT

Abq TRACON controller reported an aircraft descended at a quicker rate than expected and flew below the minimum vectoring altitude.