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Air carrier X descent to occupied altitude had less than standard separation separation from air carrier Y. System error. Air carrier X and Y TCASII RA evasive action taken.
| Attributes | |
| ACN | 210792 |
| Time | |
| Date | 199205 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : psb |
| State Reference | PA |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 210792 |
| 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 other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
After air carrier X was on ZNY's frequency, for a reason unknown to us at ZOB, air carrier X descended to FL350 and was level with air carrier Y 3 mi away (head-on) at FL350 nebound. We never found out what was the cause. We suspect TCASII alerted the pilots as they took evasive action beginning at about 1 mi away from each other. ZNY may have been on darc.
Original NASA ASRS Text
Title: ACR X DSCNT TO OCCUPIED ALT HAD LTSS SEPARATION FROM ACR Y. SYS ERROR. ACR X AND Y TCASII RA EVASIVE ACTION TAKEN.
Narrative: AFTER ACR X WAS ON ZNY'S FREQ, FOR A REASON UNKNOWN TO US AT ZOB, ACR X DSNDED TO FL350 AND WAS LEVEL WITH ACR Y 3 MI AWAY (HEAD-ON) AT FL350 NEBOUND. WE NEVER FOUND OUT WHAT WAS THE CAUSE. WE SUSPECT TCASII ALERTED THE PLTS AS THEY TOOK EVASIVE ACTION BEGINNING AT ABOUT 1 MI AWAY FROM EACH OTHER. ZNY MAY HAVE BEEN ON DARC.
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.