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B757 flight crew initiate TCASII maneuver due to VFR twin engine aircraft passing in proximity of las, lynsy RNAV STAR intersection.
| Attributes | |
| ACN | 566387 |
| Time | |
| Date | 200211 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : las.airport |
| State Reference | NV |
| Altitude | msl single value : 12500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : l30.tracon tower : ord.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | arrival star : lynsy 1 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : l30.tracon |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 2 Eng, Retractable Gear |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument pilot : flight engineer pilot : multi engine |
| Experience | flight time last 90 days : 240 flight time total : 20000 flight time type : 1500 |
| ASRS Report | 566387 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne critical |
| Independent Detector | aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 500 vertical : 500 |
| Supplementary | |
| Problem Areas | Airspace Structure Environmental Factor Flight Crew Human Performance Airport ATC Human Performance |
| Primary Problem | Environmental Factor |
Narrative:
Cleared lynsy 1 arrival to cross lynsy at 250 KTS, 12000 ft. Approximately 12500 ft on descent, got yellow TA (traffic), no visual, but TCASII displayed -900 ft just ahead 12 O'clock position. At 12300 ft, got RA, no visual. Started climb to 12700 ft and leveled, then got climb on RA altitude. Spacing on TCASII showed -700 ft, -600 ft, -500 ft, then aircraft went behind us and RA disappeared. At this time, we were 250 KTS and 13000 ft crossing lynsy. We notified controller at first TA indication, then RA and again RA climb, that we were deviating and wouldn't make altitude restr. Controller did call traffic just prior or at RA. Traffic was moderate and controller was very busy. I understood our conflict was a civilian VFR light twin. Not real sure of what would have avoided RA and deviation, other than civilian pilots being aware of arrival corridors and mandatory altitudes. It appears he was TCASII equipped, but also appeared not taking evasive action. Thank god for TCASII!
Original NASA ASRS Text
Title: B757 FLC INITIATE TCASII MANEUVER DUE TO VFR TWIN ENG ACFT PASSING IN PROX OF LAS, LYNSY RNAV STAR INTXN.
Narrative: CLRED LYNSY 1 ARR TO CROSS LYNSY AT 250 KTS, 12000 FT. APPROX 12500 FT ON DSCNT, GOT YELLOW TA (TFC), NO VISUAL, BUT TCASII DISPLAYED -900 FT JUST AHEAD 12 O'CLOCK POS. AT 12300 FT, GOT RA, NO VISUAL. STARTED CLB TO 12700 FT AND LEVELED, THEN GOT CLB ON RA ALT. SPACING ON TCASII SHOWED -700 FT, -600 FT, -500 FT, THEN ACFT WENT BEHIND US AND RA DISAPPEARED. AT THIS TIME, WE WERE 250 KTS AND 13000 FT XING LYNSY. WE NOTIFIED CTLR AT FIRST TA INDICATION, THEN RA AND AGAIN RA CLB, THAT WE WERE DEVIATING AND WOULDN'T MAKE ALT RESTR. CTLR DID CALL TFC JUST PRIOR OR AT RA. TFC WAS MODERATE AND CTLR WAS VERY BUSY. I UNDERSTOOD OUR CONFLICT WAS A CIVILIAN VFR LIGHT TWIN. NOT REAL SURE OF WHAT WOULD HAVE AVOIDED RA AND DEV, OTHER THAN CIVILIAN PLTS BEING AWARE OF ARR CORRIDORS AND MANDATORY ALTS. IT APPEARS HE WAS TCASII EQUIPPED, BUT ALSO APPEARED NOT TAKING EVASIVE ACTION. THANK GOD FOR 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.