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ZSE center controller reported that an aircraft descended too early for the approach; and went below the minimum safe altitude.
| Attributes | |
| ACN | 1495142 |
| Time | |
| Date | 201711 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZSE.ARTCC |
| State Reference | WA |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Epic Aircraft Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 10 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Inflight Event / Encounter CFTT / CFIT |
Narrative:
I vectored aircraft X for an ILS approach. After the initial vector I gave the following information; distance from FAF; heading to 230; maintain 6000 ft until established; cleared for ILS approach. After giving the clearance my radar assist mentioned my turn on angle was too great; I then corrected it and issued a 240 heading to intercept the localizer. The aircraft was descending quickly and was in and out of radar contact. In my scan I noticed I had lost radar contact for one update; next update it was back but their altitude was 5600 ft. I issued a low altitude alert; the next update was 5100 ft. I again issued a low altitude alert and asked aircraft X to climb immediately to 6000 ft. At that time my intention was to terminate their approach and try again. I waited for altitude to start a climb then did so. At that time the aircraft canceled IFR; in VFR conditions; and I switched them to tower.as this was a pilot deviation I feel my instructions were appropriate. My correction of the heading was the only thing that I felt was lacking and it was forced under pressure.
Original NASA ASRS Text
Title: ZSE Center Controller reported that an aircraft descended too early for the approach; and went below the minimum safe altitude.
Narrative: I vectored Aircraft X for an ILS approach. After the initial vector I gave the following information; distance from FAF; heading to 230; maintain 6000 ft until established; cleared for ILS approach. After giving the clearance my Radar Assist mentioned my turn on angle was too great; I then corrected it and issued a 240 heading to intercept the localizer. The aircraft was descending quickly and was in and out of radar contact. In my scan I noticed I had lost radar contact for one update; next update it was back but their altitude was 5600 ft. I issued a low altitude alert; the next update was 5100 ft. I again issued a low altitude alert and asked Aircraft X to climb immediately to 6000 ft. At that time my intention was to terminate their approach and try again. I waited for altitude to start a climb then did so. At that time the aircraft canceled IFR; in VFR conditions; and I switched them to tower.As this was a pilot deviation I feel my instructions were appropriate. My correction of the heading was the only thing that I felt was lacking and it was forced under pressure.
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.