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Approach controller descended medium large transport to altitude of enroute small aircraft with less than standard separation. Data tag drop and controller forgot about small aircraft.
| Attributes | |
| ACN | 87804 |
| Time | |
| Date | 198805 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bur |
| State Reference | CA |
| Altitude | msl bound lower : 5000 msl bound upper : 5500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bur |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other enroute : on vectors enroute airway : bur |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : developmental controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 87804 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6600 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Medium large transport X wbound 5 mi southeast bur on vector for ILS runway 7 (approximately heading 295 degrees). Small aircraft Y eastbound V186 at 5000'. Small aircraft Y was a handoff from adjacent sector and route of flight took the aircraft over the bur radar antenna. The data tag dropped. In reviewing the tape the small aircraft Y had attempted radio contact, but I hadn't answered because of priorities. I forgot the small aircraft Y and they came 1.1 mi away from one another (diverging). Although I take full responsibility for what happened, there were some contributing factors. 1) it wouldn't have happened (ie, I wouldn't have forgotten the small aircraft Y) had the data tag not dropped off. 2) it wouldn't't have happened had the adjacent sector not asked unnecessarily to descend medium large transport X (I believe they forgot the small aircraft Y also, although they were the sector that had just handed the aircraft off).
Original NASA ASRS Text
Title: APCH CTLR DESCENDED MLG TO ALT OF ENROUTE SMA WITH LESS THAN STANDARD SEPARATION. DATA TAG DROP AND CTLR FORGOT ABOUT SMA.
Narrative: MLG X WBOUND 5 MI SE BUR ON VECTOR FOR ILS RWY 7 (APPROX HDG 295 DEGS). SMA Y EBND V186 AT 5000'. SMA Y WAS A HDOF FROM ADJACENT SECTOR AND ROUTE OF FLT TOOK THE ACFT OVER THE BUR RADAR ANTENNA. THE DATA TAG DROPPED. IN REVIEWING THE TAPE THE SMA Y HAD ATTEMPTED RADIO CONTACT, BUT I HADN'T ANSWERED BECAUSE OF PRIORITIES. I FORGOT THE SMA Y AND THEY CAME 1.1 MI AWAY FROM ONE ANOTHER (DIVERGING). ALTHOUGH I TAKE FULL RESPONSIBILITY FOR WHAT HAPPENED, THERE WERE SOME CONTRIBUTING FACTORS. 1) IT WOULDN'T HAVE HAPPENED (IE, I WOULDN'T HAVE FORGOTTEN THE SMA Y) HAD THE DATA TAG NOT DROPPED OFF. 2) IT WOULDN'T'T HAVE HAPPENED HAD THE ADJACENT SECTOR NOT ASKED UNNECESSARILY TO DSND MLG X (I BELIEVE THEY FORGOT THE SMA Y ALSO, ALTHOUGH THEY WERE THE SECTOR THAT HAD JUST HANDED THE ACFT OFF).
Data retrieved from NASA's ASRS site as of August 2007 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.