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Near midair collision between commuter light transport X and intruder small aircraft Y 10 west of smo in lax TCA. Flight crew ATC review indicates traffic not passed to light transport X due data block overlap with air carrier Z on controller's scope.
| Attributes | |
| ACN | 143673 |
| Time | |
| Date | 199004 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : smo |
| State Reference | CA |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Retractable Gear |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time total : 3250 flight time type : 575 |
| ASRS Report | 143673 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 50 vertical : 20 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were leveling at 5000', 10 mi west of smo VOR when TRACON called a traffic alert at 12 O'clock less than a mi. I looked to see small aircraft Y at the same altitude filling the windshield. I pulled up hard and banked right to avoid the traffic. I estimate we missed by 20' vertical and 50' horizontal. When we got on the ground I called la TRACON to find out what caused this to happen. It appears air carrier Z jet was coming over the top of us at the same time causing our data blocks to merge and blocking out the traffic. Needless to say he made a good call considering how busy he was. The traffic in question was in the TCA. I don't know if he had a clearance or not. They had been following him since around edwards AFB. We got some good controllers down there!
Original NASA ASRS Text
Title: NMAC BETWEEN COMMUTER LTT X AND INTRUDER SMA Y 10 WEST OF SMO IN LAX TCA. FLT CREW ATC REVIEW INDICATES TRAFFIC NOT PASSED TO LTT X DUE DATA BLOCK OVERLAP WITH ACR Z ON CTLR'S SCOPE.
Narrative: WE WERE LEVELING AT 5000', 10 MI W OF SMO VOR WHEN TRACON CALLED A TFC ALERT AT 12 O'CLOCK LESS THAN A MI. I LOOKED TO SEE SMA Y AT THE SAME ALT FILLING THE WINDSHIELD. I PULLED UP HARD AND BANKED RIGHT TO AVOID THE TFC. I ESTIMATE WE MISSED BY 20' VERTICAL AND 50' HORIZONTAL. WHEN WE GOT ON THE GND I CALLED LA TRACON TO FIND OUT WHAT CAUSED THIS TO HAPPEN. IT APPEARS ACR Z JET WAS COMING OVER THE TOP OF US AT THE SAME TIME CAUSING OUR DATA BLOCKS TO MERGE AND BLOCKING OUT THE TFC. NEEDLESS TO SAY HE MADE A GOOD CALL CONSIDERING HOW BUSY HE WAS. THE TFC IN QUESTION WAS IN THE TCA. I DON'T KNOW IF HE HAD A CLRNC OR NOT. THEY HAD BEEN FOLLOWING HIM SINCE AROUND EDWARDS AFB. WE GOT SOME GOOD CTLRS DOWN THERE!
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.