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ZDC controller described loss of separation event at 15;000 during holding procedures when air carrier descended below assigned altitude and conflicted with holding aircraft below.
| Attributes | |
| ACN | 830673 |
| Time | |
| Date | 200904 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | JAYBO |
| State Reference | VA |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | EMB ERJ 135 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | Other Holding Pattern |
| Flight Plan | IFR |
| Person 1 | |
| Function | Enroute |
| Qualification | Air Traffic Control Fully Certified Flight Crew Instrument |
| Experience | Air Traffic Control Radar 3 Flight Crew Total 350 |
| Events | |
| Anomaly | Conflict Airborne Conflict Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance |
| Miss Distance | Horizontal 12000 Vertical 500 |
Narrative:
Aircraft #1 was descended to 15;000 ft and issued a north vector for holding. Aircraft #1 then descended below 15;000 ft without clearance and got in conflict with aircraft #2 holding at 14;000 ft with approach. I immediately climbed aircraft #1 to 17;000 ft and issued traffic.
Original NASA ASRS Text
Title: ZDC controller described loss of separation event at 15;000 during holding procedures when air carrier descended below assigned altitude and conflicted with holding aircraft below.
Narrative: Aircraft #1 was descended to 15;000 FT and issued a north vector for holding. Aircraft #1 then descended below 15;000 FT without clearance and got in conflict with Aircraft #2 holding at 14;000 FT with Approach. I immediately climbed Aircraft #1 to 17;000 FT and issued traffic.
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.