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ZLC center controller reported they observed an aircraft descend below their assigned altitude and below the minimum IFR altitude.
| Attributes | |
| ACN | 1648544 |
| Time | |
| Date | 201905 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZLC.ARTCC |
| State Reference | UT |
| Aircraft 1 | |
| Make Model Name | Eclipse 500 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Descent |
| Route In Use | Direct |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 5.0 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
I issued an instruction for a pilot to cross a fix at 14;000 feet. Due to a departure I restated the instruction telling the pilot to descend at 2;000 feet per minute to and maintain 14;000 feet. The pilot read back 14;000 feet and descended. The radar screen showed the pilot level; and I went through a scan. When I next saw the aircraft he was descending through 13;300 feet with a minimum IFR altitude of 12;900 feet right below him. I climbed him to 14000 feet and he read it back. His next radar update went through 12;900 feet; so I issued a safety alert. The aircraft finally stopped descending and climbed back to 14;000 feet at 11;700 feet. The pilot read back properly; so I don't have anything.
Original NASA ASRS Text
Title: ZLC Center Controller reported they observed an aircraft descend below their assigned altitude and below the Minimum IFR Altitude.
Narrative: I issued an instruction for a pilot to cross a fix at 14;000 feet. Due to a departure I restated the instruction telling the pilot to descend at 2;000 feet per minute to and maintain 14;000 feet. The pilot read back 14;000 feet and descended. The radar screen showed the pilot level; and I went through a scan. When I next saw the aircraft he was descending through 13;300 feet with a minimum IFR altitude of 12;900 feet right below him. I climbed him to 14000 feet and he read it back. His next radar update went through 12;900 feet; so I issued a safety alert. The aircraft finally stopped descending and climbed back to 14;000 feet at 11;700 feet. The pilot read back properly; so I don't have anything.
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.