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Air carrier X TCASII RA had near midair collision with VFR Y during descent. Evasive action taken. See and avoid concept.
| Attributes | |
| ACN | 247067 |
| Time | |
| Date | 199307 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : iiu |
| State Reference | KY |
| Altitude | msl bound lower : 11000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute airway : sdf |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller non radar : 4 controller radar : 3 |
| ASRS Report | 247067 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : nmac |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 100 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Air carrier X inbound to sdf descended to 11000 by ZID via LOA. Traffic Y was observed sebound at 10300, 5 mi in front of air carrier X. Air carrier X checked in, and advised of TCASII alert, and that he was climbing. I alerted indy ZID of the alert. After air carrier X passed the traffic, air carrier X returned to assigned altitude. Observed mode C at highest altitude was 12300. Separation was not lost at any time. Traffic Y continued to climb VFR sebound.
Original NASA ASRS Text
Title: ACR X TCASII RA HAD NMAC WITH VFR Y DURING DSCNT. EVASIVE ACTION TAKEN. SEE AND AVOID CONCEPT.
Narrative: ACR X INBOUND TO SDF DSNDED TO 11000 BY ZID VIA LOA. TFC Y WAS OBSERVED SEBOUND AT 10300, 5 MI IN FRONT OF ACR X. ACR X CHKED IN, AND ADVISED OF TCASII ALERT, AND THAT HE WAS CLBING. I ALERTED INDY ZID OF THE ALERT. AFTER ACR X PASSED THE TFC, ACR X RETURNED TO ASSIGNED ALT. OBSERVED MODE C AT HIGHEST ALT WAS 12300. SEPARATION WAS NOT LOST AT ANY TIME. TFC Y CONTINUED TO CLB VFR SEBOUND.
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.