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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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B757 crew in the vicinity of irk VOR received a TCASII TA, visually spotted the traffic and took evasive action by turning and going around the other aircraft.
| Attributes | |
| ACN | 426142 |
| Time | |
| Date | 199901 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : irk |
| State Reference | MO |
| Altitude | msl bound lower : 37000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 200 flight time total : 7500 flight time type : 2500 |
| ASRS Report | 426142 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | none taken : unable |
| Consequence | Other |
| Miss Distance | horizontal : 16000 vertical : 300 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
We were operating air carrier X in level cruise at FL370. The center frequency was relatively quiet. We heard ATC call air carrier X. The flight number was blocked by our TCASII calling 'traffic, traffic.' at our 2 O'clock position, we had a target showing a relative altitude of '00.' we looked and immediately had the traffic in sight at about 6 or 7 mi. ATC called air carrier Y (don't remember their flight number) traffic at 10 O'clock, I'm not talking to him. At this point we made a decision to start a right turn to pass behind the traffic. ATC again called air carrier X. We responded air carrier X 'go ahead' and received no response. ATC then called 'air carrier Y descend and maintain FL350 and hurry down. Air carrier X start a 15 degree right turn for traffic.' by the time we got that call we were already in the turn. We got a momentary RA that said 'descend, crossing, descend,' but it cleared before we could take any action. After we passed behind the traffic, we were cleared to resume our own navigation. Nothing was said by ATC, although there was a controller change. Fortunately this happened during daylight. If it had been night or IMC, and we had not started an early turn, I think this could have been a very close call, or possibly a collision. Fortunately, see and avoid, along with the controller's inputs, worked.
Original NASA ASRS Text
Title: B757 CREW IN THE VICINITY OF IRK VOR RECEIVED A TCASII TA, VISUALLY SPOTTED THE TFC AND TOOK EVASIVE ACTION BY TURNING AND GOING AROUND THE OTHER ACFT.
Narrative: WE WERE OPERATING ACR X IN LEVEL CRUISE AT FL370. THE CTR FREQ WAS RELATIVELY QUIET. WE HEARD ATC CALL ACR X. THE FLT NUMBER WAS BLOCKED BY OUR TCASII CALLING 'TFC, TFC.' AT OUR 2 O'CLOCK POS, WE HAD A TARGET SHOWING A RELATIVE ALT OF '00.' WE LOOKED AND IMMEDIATELY HAD THE TFC IN SIGHT AT ABOUT 6 OR 7 MI. ATC CALLED ACR Y (DON'T REMEMBER THEIR FLT NUMBER) TFC AT 10 O'CLOCK, I'M NOT TALKING TO HIM. AT THIS POINT WE MADE A DECISION TO START A R TURN TO PASS BEHIND THE TFC. ATC AGAIN CALLED ACR X. WE RESPONDED ACR X 'GO AHEAD' AND RECEIVED NO RESPONSE. ATC THEN CALLED 'ACR Y DSND AND MAINTAIN FL350 AND HURRY DOWN. ACR X START A 15 DEG R TURN FOR TFC.' BY THE TIME WE GOT THAT CALL WE WERE ALREADY IN THE TURN. WE GOT A MOMENTARY RA THAT SAID 'DSND, XING, DSND,' BUT IT CLRED BEFORE WE COULD TAKE ANY ACTION. AFTER WE PASSED BEHIND THE TFC, WE WERE CLRED TO RESUME OUR OWN NAV. NOTHING WAS SAID BY ATC, ALTHOUGH THERE WAS A CTLR CHANGE. FORTUNATELY THIS HAPPENED DURING DAYLIGHT. IF IT HAD BEEN NIGHT OR IMC, AND WE HAD NOT STARTED AN EARLY TURN, I THINK THIS COULD HAVE BEEN A VERY CLOSE CALL, OR POSSIBLY A COLLISION. FORTUNATELY, SEE AND AVOID, ALONG WITH THE CTLR'S INPUTS, WORKED.
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.