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Cpr approach controller reported an aircraft cleared for an approach descended below the assigned altitude and below the MVA.
| Attributes | |
| ACN | 1455157 |
| Time | |
| Date | 201706 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | CPR.TRACON |
| State Reference | WY |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Medium Transport Low Wing 2 Turbojet Eng |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 0.5 |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
Aircraft X was being vectored for a straight-in runway 21 approach. I issued a correct clearance to cross buwme at or above 7;500 ft. The pilot read back 7;000 and the error was not caught by me. These events occurred in an MVA of 7;500 ft. I observed the aircraft descending to 7;200 ft and corrected the aircraft. The lowest altitude observed was 7;000 ft. Once corrected the pilot stated that he could maintain his own terrain and obstruction clearance; which in this case is not applicable. I reissued the correct crossing altitude and clearance; and the aircraft landed without incident. The flm on duty was working local control/ground control/FD/clearance delivery/controller in charge combined at the time due to low traffic volume. He was immediately aware of the situation as it was happening and after the aircraft landed; he was issued a brasher warning.ensure correct read-back of instructions despite traffic volume. I was monitoring the altitude and was able to correct it once the 300 ft variance was no longer a factor; so proper scan will correct it; even if you miss the read-back.
Original NASA ASRS Text
Title: CPR Approach Controller reported an aircraft cleared for an approach descended below the assigned altitude and below the MVA.
Narrative: Aircraft X was being vectored for a straight-in Runway 21 approach. I issued a correct clearance to cross BUWME at or above 7;500 ft. The pilot read back 7;000 and the error was not caught by me. These events occurred in an MVA of 7;500 ft. I observed the aircraft descending to 7;200 ft and corrected the aircraft. The lowest altitude observed was 7;000 ft. Once corrected the pilot stated that he could maintain his own terrain and obstruction clearance; which in this case is not applicable. I reissued the correct crossing altitude and clearance; and the aircraft landed without incident. The FLM on duty was working LC/GC/FD/CD/CIC combined at the time due to low traffic volume. He was immediately aware of the situation as it was happening and after the aircraft landed; he was issued a BRASHER warning.Ensure correct read-back of instructions despite traffic volume. I was monitoring the altitude and was able to correct it once the 300 ft variance was no longer a factor; so proper scan will correct it; even if you miss the read-back.
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.