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S56 tracon controller reported E175 descended below assigned altitude resulting in an MVA violation.
| Attributes | |
| ACN | 1713359 |
| Time | |
| Date | 201912 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | S56.TRACON |
| State Reference | UT |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
Aircraft X was descended in the downwind to 090. As the aircraft was approaching 090; I descended the aircraft to 085 and turned 5-degrees left (they were going to runway 34R not the west runway). The aircraft read the instruction back appropriately. Shortly later I based the aircraft as they were showing 085. The aircraft read back the instruction and I noticed the tag at 083. I immediately keyed up and verified they were level 085; they said we are leveling right now at 080. They were already in the base turn and turning away from the higher terrain; so I did not issue a low altitude alert or climb and told them to maintain 080. I reviewed the tape and the aircraft did read back 085. They were still in the 085 MVA at 080. With a proper read-back there is nothing to do to stop this from happening. Maybe 500 ft. Altitudes are confusing to pilots? I've never had an aircraft bust an altitude with this before; so I don't think I would change anything.
Original NASA ASRS Text
Title: S56 Tracon Controller reported E175 descended below assigned altitude resulting in an MVA violation.
Narrative: Aircraft X was descended in the downwind to 090. As the aircraft was approaching 090; I descended the aircraft to 085 and turned 5-degrees left (they were going to Runway 34R not the west runway). The aircraft read the instruction back appropriately. Shortly later I based the aircraft as they were showing 085. The aircraft read back the instruction and I noticed the tag at 083. I immediately keyed up and verified they were level 085; they said we are leveling right now at 080. They were already in the base turn and turning away from the higher terrain; so I did not issue a low altitude alert or climb and told them to maintain 080. I reviewed the tape and the aircraft did read back 085. They were still in the 085 MVA at 080. With a proper read-back there is nothing to do to stop this from happening. Maybe 500 ft. altitudes are confusing to pilots? I've never had an aircraft bust an altitude with this before; so I don't think I would change 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.