Fort meyers approach controller reported anticipating an aircraft would not descend below the minimu...

Attributes
ACN	1620638
Time
Date	201902
Local Time Of Day	1201-1800
Place
Locale Reference	APF.Airport
State Reference	FL
Environment
Light	Daylight
Aircraft 1
Make Model Name	Challenger 300
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors Visual Approach
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X was inbound to apf and I was vectoring for a RNAV approach for runway 23 at apf. I descended the aircraft to 2100 and asked if he wanted the full approach or vectors. Looking at his altitude I did not think he would descend to below the MVA (minimum vectoring altitude) prior to passing the obstacle so I issued a descent to 1600 and a turn to heading 320. Aircraft X descended faster than expected and was below the MVA while he appeared to be over the depicted obstacle. Aircraft X then called the field in sight and was cleared for the visual approach runway 23 at apf.I will not assume a descent profile and just keep them above the MVA until I'm ready to clear the aircraft.

Original NASA ASRS Text

Title: Fort Meyers Approach Controller reported anticipating an aircraft would not descend below the Minimum Vectoring Altitude; but the aircraft descended quicker than the reporter expected resulting in a MVA violation.

Narrative: Aircraft X was inbound to APF and I was vectoring for a RNAV approach for RWY 23 at APF. I descended the aircraft to 2100 and asked if he wanted the full approach or vectors. Looking at his altitude I did not think he would descend to below the MVA (Minimum Vectoring Altitude) prior to passing the obstacle so I issued a descent to 1600 and a turn to heading 320. Aircraft X descended faster than expected and was below the MVA while he appeared to be over the depicted obstacle. Aircraft X then called the field in sight and was cleared for the visual approach RWY 23 at APF.I will not assume a descent profile and just keep them above the MVA until I'm ready to clear 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.

Fort meyers approach controller reported anticipating an aircraft would not descend below the minimum vectoring altitude; but the aircraft descended quicker than the reporter expected resulting in a MVA violation.