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ZLA radar assoc described operational error at 11000 ft; controller clearance and/or pilot readback suspected as causal factor; lateral separation less than required.
| Attributes | |
| ACN | 736424 |
| Time | |
| Date | 200704 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zla.artcc |
| State Reference | CA |
| Altitude | msl single value : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | general aviation : personal |
| Make Model Name | Beechcraft Twin Turboprop Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : developmental |
| Experience | controller military : 4 controller radar : 0 |
| ASRS Report | 736424 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance controller : issued alert flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was turned 20 degrees left for aircraft Y over pillo intersection and told to expect direct swatt. Air carrier X was then cleared direct pillo. I did not hear the clearance issued. The r-side and I noticed a turn by air carrier X into aircraft Y. The r-side then took corrective actions.
Original NASA ASRS Text
Title: ZLA RADAR ASSOC DESCRIBED OPERROR AT 11000 FT; CTLR CLRNC AND/OR PLT READBACK SUSPECTED AS CAUSAL FACTOR; LATERAL SEPARATION LESS THAN REQUIRED.
Narrative: ACR X WAS TURNED 20 DEGS L FOR ACFT Y OVER PILLO INTXN AND TOLD TO EXPECT DIRECT SWATT. ACR X WAS THEN CLRED DIRECT PILLO. I DID NOT HEAR THE CLRNC ISSUED. THE R-SIDE AND I NOTICED A TURN BY ACR X INTO ACFT Y. THE R-SIDE THEN TOOK CORRECTIVE ACTIONS.
Data retrieved from NASA's ASRS site as of January 2009 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.