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Norcal TRACON controller reported that an aircraft descended below assigned altitude causing a loss of separation with a heavy aircraft.
| Attributes | |
| ACN | 1486324 |
| Time | |
| Date | 201710 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | SJC |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | Widebody Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR BRIXX2 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Approach |
| Qualification | Air Traffic Control Fully Certified |
| Experience | Air Traffic Control Time Certified In Pos 1 (yrs) 8 |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy |
Narrative:
Aircraft X descending on brixx arrival for sjc to 12;000. Aircraft Y descending on bdega for sfo to 11;000. Aircraft Y was advised of traffic and cautioned for wake turbulence on aircraft X restricted above descending to 12;000. Aircraft Y requested a vector to get away from wake. I turned to 160. Shortly after; I observed aircraft X descending out of 11;800 and advised it should be leveling at 12;000. Aircraft X advised that's not how he understood his clearance. Brasher statement issued.remove MEA altitudes on brixx arrival after brixx to reduce confusion with descend via altitudes.
Original NASA ASRS Text
Title: NorCal TRACON Controller reported that an aircraft descended below assigned altitude causing a loss of separation with a heavy aircraft.
Narrative: Aircraft X descending on BRIXX arrival for SJC to 12;000. Aircraft Y descending on BDEGA for SFO to 11;000. Aircraft Y was advised of traffic and cautioned for wake turbulence on Aircraft X restricted above descending to 12;000. Aircraft Y requested a vector to get away from wake. I turned to 160. Shortly after; I observed Aircraft X descending out of 11;800 and advised it should be leveling at 12;000. Aircraft X advised that's not how he understood his clearance. Brasher statement issued.Remove MEA altitudes on BRIXX arrival after BRIXX to reduce confusion with descend via altitudes.
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.