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Mli TRACON controller reported an aircraft executed a turn wider than they expected and flew below the minimum vectoring altitude.
| Attributes | |
| ACN | 1683287 |
| Time | |
| Date | 201909 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | MLI.Airport |
| State Reference | IL |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Departure |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 1 |
| Events | |
| Anomaly | ATC Issue All Types Inflight Event / Encounter CFTT / CFIT |
Narrative:
A bonanza took off and wanted to turn straight back to the west for a practice RNAV approach. On initial call they were at 1500 ft. On a 050 heading about a mile from the runway so I turned them to a 270 heading. The small aircraft turned very slow and it took them about 4 to 5 miles to make the full turn to the west. At that time they were in a MVA (minimum vectoring altitude) area of 3000 ft. Still at 1900 ft. When they entered the MVA. I turned them more to the south to get them away from the obstruction but by that time they were already reaching the height of the obstruction of 2100 ft. And I turned them back to their initial approach fix. I should have known that a student pilot in a small aircraft which can usually turn very tight is not going to fly the aircraft as someone who is not a student. Also complacency; I have turned several aircraft without issue inside of the MVA because small aircraft can turn so tight.
Original NASA ASRS Text
Title: MLI TRACON Controller reported an aircraft executed a turn wider than they expected and flew below the Minimum Vectoring Altitude.
Narrative: A Bonanza took off and wanted to turn straight back to the west for a practice RNAV approach. On initial call they were at 1500 ft. on a 050 heading about a mile from the runway so I turned them to a 270 heading. The small aircraft turned very slow and it took them about 4 to 5 miles to make the full turn to the west. At that time they were in a MVA (Minimum Vectoring Altitude) area of 3000 ft. still at 1900 ft. when they entered the MVA. I turned them more to the south to get them away from the obstruction but by that time they were already reaching the height of the obstruction of 2100 ft. and I turned them back to their initial approach fix. I should have known that a student pilot in a small aircraft which can usually turn very tight is not going to fly the aircraft as someone who is not a student. Also complacency; I have turned several aircraft without issue inside of the MVA because small aircraft can turn so tight.
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.