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Air carrier Y TCASII RA non adherence to ATC clearance had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 302331 |
| Time | |
| Date | 199504 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : alb |
| State Reference | NY |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw tower : fll |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| 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 : 10 |
| ASRS Report | 302331 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 302409 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
Air carrier X FL330 nnwbound working the sector north of mine. Air carrier Y FL330 eastbound. Air carrier X was turned nwbound to avoid a situation with wbound traffic. Air carrier Y was not descended due to wbound traffic FL310. Other handoffs increased my workload and I did not descend Y in time. Supplemental information from acn 302409: air carrier X northbound traffic at FL330 merging with air carrier Y eastbound traffic at FL330. Y issued descent and did not take prompt action due to a TCASII alert that told him to climb. He eventually went down but not before the operational error.
Original NASA ASRS Text
Title: ACR Y TCASII RA NON ADHERENCE TO ATC CLRNC HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X FL330 NNWBOUND WORKING THE SECTOR N OF MINE. ACR Y FL330 EBOUND. ACR X WAS TURNED NWBOUND TO AVOID A SIT WITH WBOUND TFC. ACR Y WAS NOT DSNDED DUE TO WBOUND TFC FL310. OTHER HDOFS INCREASED MY WORKLOAD AND I DID NOT DSND Y IN TIME. SUPPLEMENTAL INFO FROM ACN 302409: ACR X NBOUND TFC AT FL330 MERGING WITH ACR Y EBOUND TFC AT FL330. Y ISSUED DSCNT AND DID NOT TAKE PROMPT ACTION DUE TO A TCASII ALERT THAT TOLD HIM TO CLB. HE EVENTUALLY WENT DOWN BUT NOT BEFORE THE OPERROR.
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.