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C550 does not make an expected turn on course and climbs as cleared. ARTCC radar controllers do not observe situation until conflict alert activates. Control actions insufficient to maintain separation with air carrier jet.
| Attributes | |
| ACN | 422002 |
| Time | |
| Date | 199812 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ape |
| State Reference | OH |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Citation II S2/Bravo |
| Operating Under FAR Part | Part 91 |
| 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 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller radar : 18 |
| ASRS Report | 422002 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 12 controller radar : 9 |
| ASRS Report | 422007 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 25200 vertical : 600 |
| Supplementary | |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Aircraft climbed into other after taking over 3 mins to turn onto preferential routing. Supplemental information from acn 422007: aircraft X swbound at FL290 was given clearance to climb to FL330. The radar controller believed aircraft X was on course as per his flight strip said direct ric. Aircraft Y was not a factor. 2 1/2 mins later, aircraft X was observed sbound and in conflict with aircraft Y. Aircraft X had made an approximately 30 degree turn without the controller's knowledge. A left turn was issued to aircraft X. Conflict alert activated then at 10 mi. Another turn was issued to aircraft X. Separation was lost. After the error, it was found that the previous sector had cleared aircraft X and preferential routing to ric, which would mean aircraft X would turn south 20-30 degrees for the hvq VORTAC. It's been shown aircraft X took approximately 3 mins before he turned to hvq.
Original NASA ASRS Text
Title: C550 DOES NOT MAKE AN EXPECTED TURN ON COURSE AND CLBS AS CLRED. ARTCC RADAR CTLRS DO NOT OBSERVE SIT UNTIL CONFLICT ALERT ACTIVATES. CTL ACTIONS INSUFFICIENT TO MAINTAIN SEPARATION WITH ACR JET.
Narrative: ACFT CLBED INTO OTHER AFTER TAKING OVER 3 MINS TO TURN ONTO PREFERENTIAL ROUTING. SUPPLEMENTAL INFO FROM ACN 422007: ACFT X SWBOUND AT FL290 WAS GIVEN CLRNC TO CLB TO FL330. THE RADAR CTLR BELIEVED ACFT X WAS ON COURSE AS PER HIS FLT STRIP SAID DIRECT RIC. ACFT Y WAS NOT A FACTOR. 2 1/2 MINS LATER, ACFT X WAS OBSERVED SBOUND AND IN CONFLICT WITH ACFT Y. ACFT X HAD MADE AN APPROX 30 DEG TURN WITHOUT THE CTLR'S KNOWLEDGE. A L TURN WAS ISSUED TO ACFT X. CONFLICT ALERT ACTIVATED THEN AT 10 MI. ANOTHER TURN WAS ISSUED TO ACFT X. SEPARATION WAS LOST. AFTER THE ERROR, IT WAS FOUND THAT THE PREVIOUS SECTOR HAD CLRED ACFT X AND PREFERENTIAL ROUTING TO RIC, WHICH WOULD MEAN ACFT X WOULD TURN S 20-30 DEGS FOR THE HVQ VORTAC. IT'S BEEN SHOWN ACFT X TOOK APPROX 3 MINS BEFORE HE TURNED TO HVQ.
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.