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Small aircraft Y unauthorized penetration of TCA airspace had near midair collision with air carrier X TCASII RA. Evasive action taken.
| Attributes | |
| ACN | 247275 |
| Time | |
| Date | 199304 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 5000 msl bound upper : 5000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | descent other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | government : faa |
| Function | other personnel other |
| Qualification | controller : radar |
| ASRS Report | 247275 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller radar : 12 |
| Events | |
| Anomaly | conflict : nmac non adherence : far non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X wbound at 5000 ft. The controller observed a fast moving target out of 6300 ft descending 5 mi opposite direction with air carrier X. The controller attempted to issue traffic and turn air carrier X with no response. After the aircraft passed, air carrier X advised he had a TCASII RA. Air carrier X advised the other aircraft was an small aircraft performing aerobatics, he was squawking XXXX. Workload: medium. Communication was after event. The controller attempted to turn air carrier X, but got no response. The controller suspected they were concentrating on their TCASII and did not respond or hear the xmissions.
Original NASA ASRS Text
Title: SMA Y UNAUTH PENETRATION OF TCA AIRSPACE HAD NMAC WITH ACR X TCASII RA. EVASIVE ACTION TAKEN.
Narrative: ACR X WBOUND AT 5000 FT. THE CTLR OBSERVED A FAST MOVING TARGET OUT OF 6300 FT DSNDING 5 MI OPPOSITE DIRECTION WITH ACR X. THE CTLR ATTEMPTED TO ISSUE TFC AND TURN ACR X WITH NO RESPONSE. AFTER THE ACFT PASSED, ACR X ADVISED HE HAD A TCASII RA. ACR X ADVISED THE OTHER ACFT WAS AN SMA PERFORMING AEROBATICS, HE WAS SQUAWKING XXXX. WORKLOAD: MEDIUM. COM WAS AFTER EVENT. THE CTLR ATTEMPTED TO TURN ACR X, BUT GOT NO RESPONSE. THE CTLR SUSPECTED THEY WERE CONCENTRATING ON THEIR TCASII AND DID NOT RESPOND OR HEAR THE XMISSIONS.
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.