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Salt lake ARTCC controller reported an aircraft descending below a transition altitude by 2;000 feet.
| Attributes | |
| ACN | 1571965 |
| Time | |
| Date | 201808 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | IDA.Airport |
| State Reference | ID |
| Aircraft 1 | |
| Make Model Name | Medium Large Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
Aircraft X was cleared for an ILS approach via the sabat transition. The transition altitude all the way to the localizer is 11;500 feet. The pilot descended to 9;500 feet. I checked the approach plate to see if there was a descending altitude on the transition that I missed; but I couldn't see one; so I queried the pilot about the procedure. He said I was correct; that the transition altitude remained at 11;500 feet. I gave the pilot a low altitude alert; then climbed him to the mia [minimum IFR altitude] of 10;000 [feet] and vectored the aircraft onto the localizer.
Original NASA ASRS Text
Title: Salt Lake ARTCC Controller reported an aircraft descending below a transition altitude by 2;000 feet.
Narrative: Aircraft X was cleared for an ILS approach via the SABAT transition. The transition altitude all the way to the localizer is 11;500 feet. The pilot descended to 9;500 feet. I checked the approach plate to see if there was a descending altitude on the transition that I missed; but I couldn't see one; so I queried the pilot about the procedure. He said I was correct; that the transition altitude remained at 11;500 feet. I gave the pilot a low altitude alert; then climbed him to the MIA [Minimum IFR Altitude] of 10;000 [feet] and vectored the aircraft onto the localizer.
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.