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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier X same altitude assignment had less than standard separation from small aircraft Y. System error.
| Attributes | |
| ACN | 209365 |
| Time | |
| Date | 199204 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ric |
| State Reference | VA |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ric |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : direct enroute airway : ric |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller radar : 22 |
| ASRS Report | 209365 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 9000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X departed ric for orf. He was called radar contact and climbed to 9000 direct hcm. His route of flight looked clean and his frequency was changed to the center. I got up from my scope to go to another scope to coordination for them. When I walked back to my scope I observed air carrier and small aircraft Y, an overflt at 9000 ft nebound on V213 were converging. I turned small aircraft Y and then called the center about air carrier X. Center said the air carrier X had the small aircraft Y in sight and was turning to pass behind small aircraft Y. Aircraft passed about 1 1/2 mi at same altitude. Conclusion. The ARTS data may have fallen off small aircraft Y before I changed air carrier X frequency to center and then retagged and I then observed them converging. Also it may have helped if the center would have climbed air carrier X instead of leaving him at 9000 for awhile.
Original NASA ASRS Text
Title: ACR X SAME ALT ASSIGNMENT HAD LTSS FROM SMA Y. SYS ERROR.
Narrative: ACR X DEPARTED RIC FOR ORF. HE WAS CALLED RADAR CONTACT AND CLBED TO 9000 DIRECT HCM. HIS RTE OF FLT LOOKED CLEAN AND HIS FREQ WAS CHANGED TO THE CTR. I GOT UP FROM MY SCOPE TO GO TO ANOTHER SCOPE TO COORD FOR THEM. WHEN I WALKED BACK TO MY SCOPE I OBSERVED ACR AND SMA Y, AN OVERFLT AT 9000 FT NEBOUND ON V213 WERE CONVERGING. I TURNED SMA Y AND THEN CALLED THE CTR ABOUT ACR X. CTR SAID THE ACR X HAD THE SMA Y IN SIGHT AND WAS TURNING TO PASS BEHIND SMA Y. ACFT PASSED ABOUT 1 1/2 MI AT SAME ALT. CONCLUSION. THE ARTS DATA MAY HAVE FALLEN OFF SMA Y BEFORE I CHANGED ACR X FREQ TO CTR AND THEN RETAGGED AND I THEN OBSERVED THEM CONVERGING. ALSO IT MAY HAVE HELPED IF THE CTR WOULD HAVE CLBED ACR X INSTEAD OF LEAVING HIM AT 9000 FOR AWHILE.
Data retrieved from NASA's ASRS site as of July 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.