A TRACON controller reported aircraft was issued a descent clearance; descended faster than anticipa...

Attributes
ACN	1671200
Time
Date	201908
Local Time Of Day	1201-1800
Place
Locale Reference	MSN.Airport
State Reference	WI
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 135
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach Supervisor / CIC
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 11
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X descending into msn from the northwest; initially issued 4000 ft. To stay above MVA (minimum vectoring altitude) of 3200 ft.; aircraft still high 25 NM northwest; out of 8000 ft. Aircraft issued 3000 ft.; anticipating would not be below 3200 ft. While still over that MVA area; however aircraft descended faster than expected and was observed at 3000 ft. At the very southeast portion of the 3200 ft. MVA where transitions to the 2700 ft. MVA. Weather in area better than 5000/5. C56X can perform very differently depending on flight crew and experience; in the future I won't anticipate quite as soon and observe how aircraft is performing initially.

Original NASA ASRS Text

Title: A TRACON Controller reported aircraft was issued a descent clearance; descended faster than anticipated and flew below the Minimum Vectoring Altitude.

Narrative: Aircraft X descending into MSN from the northwest; initially issued 4000 ft. to stay above MVA (Minimum Vectoring Altitude) of 3200 ft.; aircraft still high 25 NM northwest; out of 8000 ft. aircraft issued 3000 ft.; anticipating would NOT be below 3200 ft. while still over that MVA area; however aircraft descended faster than expected and was observed at 3000 ft. at the very southeast portion of the 3200 ft. MVA where transitions to the 2700 ft. MVA. Weather in area better than 5000/5. C56X can perform very differently depending on flight crew and experience; in the future I won't anticipate quite as soon and observe how aircraft is performing initially.

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.

A TRACON controller reported aircraft was issued a descent clearance; descended faster than anticipated and flew below the minimum vectoring altitude.