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Nct controller described a possible MVA infraction when an aircraft assigned 9;700 continued descent to 9;000 apparently confusing the clearance; no ATC alarms were activated.
| Attributes | |
| ACN | 924606 |
| Time | |
| Date | 201012 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | NCT.TRACON |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | King Air C90 E90 |
| Flight Phase | Descent |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Person 1 | |
| Function | Departure Approach |
| Qualification | Air Traffic Control Developmental |
| Events | |
| Anomaly | Deviation - Altitude Overshoot Deviation - Procedural Clearance Inflight Event / Encounter CFTT / CFIT |
Narrative:
I descended a BE90 to 9;700 (MVA). Pilot read back the correct altitude. I was busy vectoring/working other aircraft and the pilot asked what his altitude assignment was. I looked at his mode C and it indicated 9;000. I did not notice that he descended below the assigned altitude. He was entering a 8;400 MVA so I descended him to 8;400 ft. The low altitude alert did not go off.
Original NASA ASRS Text
Title: NCT Controller described a possible MVA infraction when an aircraft assigned 9;700 continued descent to 9;000 apparently confusing the clearance; no ATC alarms were activated.
Narrative: I descended a BE90 to 9;700 (MVA). Pilot read back the correct altitude. I was busy vectoring/working other aircraft and the pilot asked what his altitude assignment was. I looked at his Mode C and it indicated 9;000. I did not notice that he descended below the assigned altitude. He was entering a 8;400 MVA so I descended him to 8;400 FT. The Low Altitude alert did not go off.
Data retrieved from NASA's ASRS site as of April 2012 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.