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Sdf controller reported a TEX2 descended below assigned altitude entering a higher MVA.
| Attributes | |
| ACN | 1693231 |
| Time | |
| Date | 201910 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | SDF.TRACON |
| State Reference | KY |
| Aircraft 1 | |
| Make Model Name | T6A Texan II / Harvard II (Raytheon) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Final Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
I was working the DR1 position and providing aircraft vectors to the ILS runway 17L. Aircraft was assigned 3;000 feet to maintain. I had given aircraft a 140 turn to join the localizer and went on to other traffic. I went back to aircraft and cleared for the ILS. Just after I finished issuing the instructions I noticed aircraft had already descended through 2;800 feet in the vicinity of antennas requiring a 3;000 feet MVA. The pilot read back 3;000 feet correctly yet was still below 3;000 feet. Thinking I just busted the MVA I notified the controller in charge; who immediately started reviewing tapes and falcon. Aircraft was already clear of the obstacle so I allowed them to continue on the approach as they were in a critical phase of flight to climb up to come right back down. Review of the tapes and falcon showed a pilot deviation as he never went back to 3;000 feet. I could've cancelled the approach clearance and re-vectored for the approach or reiterated the pilot maintain 3;000 feet.
Original NASA ASRS Text
Title: SDF Controller reported a TEX2 descended below assigned altitude entering a higher MVA.
Narrative: I was working the DR1 position and providing Aircraft vectors to the ILS Runway 17L. Aircraft was assigned 3;000 feet to maintain. I had given Aircraft a 140 turn to join the localizer and went on to other traffic. I went back to Aircraft and cleared for the ILS. Just after I finished issuing the instructions I noticed Aircraft had already descended through 2;800 feet in the vicinity of antennas requiring a 3;000 feet MVA. The pilot read back 3;000 feet correctly yet was still below 3;000 feet. Thinking I just busted the MVA I notified the CIC; who immediately started reviewing tapes and falcon. Aircraft was already clear of the obstacle so I allowed them to continue on the approach as they were in a critical phase of flight to climb up to come right back down. Review of the tapes and falcon showed a pilot deviation as he never went back to 3;000 feet. I could've cancelled the approach clearance and re-vectored for the approach or reiterated the pilot maintain 3;000 feet.
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.