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ARTCC radar controller failed to hear clearance readback which resulted in less than standard separation between small transport X and light transport Y.
| Attributes | |
| ACN | 173387 |
| Time | |
| Date | 199103 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mry |
| State Reference | CA |
| Altitude | msl bound lower : 9000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : zoa |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 6 |
| ASRS Report | 173387 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 6000 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I issued a clearance for small transport X to descend to 8000' from 12000'. An light transport Y departed the mry airport climbing to 6000' and requesting higher. I amended the clearance to small transport X to descend to 10000'. I then climbed the light transport Y to 9000', but the clearance to 10000' to small transport X was read back by small transport Z. Small transport X continued his descent to 8000' and became in conflict with the light transport Y climbing to 9000'. I failed to hear that the wrong aircraft responded to the clearance.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR FAILED TO HEAR CLRNC READBACK WHICH RESULTED IN LESS THAN STANDARD SEPARATION BETWEEN SMT X AND LTT Y.
Narrative: I ISSUED A CLRNC FOR SMT X TO DSND TO 8000' FROM 12000'. AN LTT Y DEPARTED THE MRY ARPT CLBING TO 6000' AND REQUESTING HIGHER. I AMENDED THE CLRNC TO SMT X TO DSND TO 10000'. I THEN CLBED THE LTT Y TO 9000', BUT THE CLRNC TO 10000' TO SMT X WAS READ BACK BY SMT Z. SMT X CONTINUED HIS DSNT TO 8000' AND BECAME IN CONFLICT WITH THE LTT Y CLBING TO 9000'. I FAILED TO HEAR THAT THE WRONG ACFT RESPONDED TO THE CLRNC.
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.