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ZMP center controller reported an aircraft descended below its assigned altitude and went below the minimum IFR altitude (mia).
| Attributes | |
| ACN | 1443304 |
| Time | |
| Date | 201704 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | STC.Airport |
| State Reference | MN |
| Aircraft 1 | |
| Make Model Name | Small Transport Low Wing 2 Turboprop Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 2 |
| Events | |
| Anomaly | Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
I gave aircraft X an approach clearance to maintain at or above 3;500 feet until established at (sanly) on the localizer ILS 31 approach into stc. The pilot read it back; however descended to 3;000 feet which is 500 feet below the minimum IFR altitude (mia). I climbed the plane back up to 3;500 feet.do pilots know the mias? Do their flight management systems know?
Original NASA ASRS Text
Title: ZMP Center Controller reported an aircraft descended below its assigned altitude and went below the Minimum IFR Altitude (MIA).
Narrative: I gave aircraft X an approach clearance to maintain at or above 3;500 feet until established at (SANLY) on the localizer ILS 31 Approach into STC. The pilot read it back; however descended to 3;000 feet which is 500 feet below the Minimum IFR Altitude (MIA). I climbed the plane back up to 3;500 feet.Do pilots know the MIAs? Do their flight management systems know?
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.