Tys TRACON controller reported an aircraft descended below the assigned altitude and below the minim...

Attributes
ACN	1452734
Time
Date	201705
Local Time Of Day	1801-2400
Place
Locale Reference	MOR.Airport
State Reference	TN
Environment
Light	Daylight
Aircraft 1
Make Model Name	Small Aircraft Low Wing 2 Eng Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Vectors
Flight Plan	IFR
Person 1
Function	Approach
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT

Narrative:

Aircraft X was inbound to mor airport at 7000 feet. As he entered my airspace at 7000 feet he was in a minimum vectoring altitude at 5000 feet. I descended him to 5000 feet and he read back 5000 feet. By the time I noticed he had descended to 4100 feet at which time I re-emphasized 5000 feet. He made corrective actions to return to 5000 feet. I don't have any specific recommendations for occurrences like these. Perhaps the pilots could use more automation to ensure they do not continue a descent through an assigned altitude. Perhaps (different than our current low altitude alert) stars could have some function where an IFR aircraft data block could turn red or yellow when beneath a minimum vectoring altitude.

Original NASA ASRS Text

Title: TYS TRACON Controller reported an aircraft descended below the assigned altitude and below the Minimum Vectoring Altitude.

Narrative: Aircraft X was inbound to MOR airport at 7000 feet. As he entered my airspace at 7000 feet he was in a Minimum Vectoring Altitude at 5000 feet. I descended him to 5000 feet and he read back 5000 feet. By the time I noticed he had descended to 4100 feet at which time I re-emphasized 5000 feet. He made corrective actions to return to 5000 feet. I don't have any specific recommendations for occurrences like these. Perhaps the pilots could use more automation to ensure they do not continue a descent through an assigned altitude. Perhaps (different than our current low altitude alert) STARS could have some function where an IFR aircraft data block could turn red or yellow when beneath a Minimum Vectoring Altitude.

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.

Tys TRACON controller reported an aircraft descended below the assigned altitude and below the minimum vectoring altitude.