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An air carrier flight crew in a B737 see another aircraft on their TCASII display and turn to avoid it. The ATCT local controller also warns them of the traffic as they see the cessna turning away.
| Attributes | |
| ACN | 384460 |
| Time | |
| Date | 199710 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ont |
| State Reference | CA |
| Altitude | msl bound lower : 4100 msl bound upper : 4100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ont tower : iad |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Single Piston Undifferentiated or Other Model |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 90 flight time total : 10000 flight time type : 8000 |
| ASRS Report | 384460 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 700 vertical : 300 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Visual approach into ontario on a 45 degree extended dogleg, descending to 3000 ft. At about 8 mi, handed IFR from approach to tower. TCASII showed uncorrelated aircraft at 2 O'clock position and 3 mi. Turned left slightly, tower announced traffic at same time we see high wing, retracted gear, cessna doing a hard left turn. Reported traffic in sight and continued to land. Had TCASII not alerted us, I would not have turned slightly left (away) and the traffic could have been very close. I like TCASII.
Original NASA ASRS Text
Title: AN ACR FLC IN A B737 SEE ANOTHER ACFT ON THEIR TCASII DISPLAY AND TURN TO AVOID IT. THE ATCT LCL CTLR ALSO WARNS THEM OF THE TFC AS THEY SEE THE CESSNA TURNING AWAY.
Narrative: VISUAL APCH INTO ONTARIO ON A 45 DEG EXTENDED DOGLEG, DSNDING TO 3000 FT. AT ABOUT 8 MI, HANDED IFR FROM APCH TO TWR. TCASII SHOWED UNCORRELATED ACFT AT 2 O'CLOCK POS AND 3 MI. TURNED L SLIGHTLY, TWR ANNOUNCED TFC AT SAME TIME WE SEE HIGH WING, RETRACTED GEAR, CESSNA DOING A HARD L TURN. RPTED TFC IN SIGHT AND CONTINUED TO LAND. HAD TCASII NOT ALERTED US, I WOULD NOT HAVE TURNED SLIGHTLY L (AWAY) AND THE TFC COULD HAVE BEEN VERY CLOSE. I LIKE TCASII.
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.