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While on approach at stl, an light transport aircraft has an small aircraft intrude into his area causing a TCASII alert. Flight crew suspects small aircraft was simply an intruder.
| Attributes | |
| ACN | 413545 |
| Time | |
| Date | 199809 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : stl |
| State Reference | MO |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : stl |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 6800 flight time type : 200 |
| ASRS Report | 413545 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : unable none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | horizontal : 1200 vertical : 300 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
While on a visual approach to stl at 10-12 mi out on the ILS to runway 12R at stl, TCASII reported traffic at our 1 O'clock position and lower than us. The TCASII reported the traffic was at 300 ft lower than our position. We then picked up the traffic visually and avoided conflict as he passed under our nose on a north heading. The traffic appeared to be a low wing single engine reciprocating aircraft. We then reported the traffic to stl tower because we had just switched to tower frequency. I believe the aircraft had strayed into the stl class B, probably with a bad transponder.
Original NASA ASRS Text
Title: WHILE ON APCH AT STL, AN LTT ACFT HAS AN SMA INTRUDE INTO HIS AREA CAUSING A TCASII ALERT. FLC SUSPECTS SMA WAS SIMPLY AN INTRUDER.
Narrative: WHILE ON A VISUAL APCH TO STL AT 10-12 MI OUT ON THE ILS TO RWY 12R AT STL, TCASII RPTED TFC AT OUR 1 O'CLOCK POS AND LOWER THAN US. THE TCASII RPTED THE TFC WAS AT 300 FT LOWER THAN OUR POS. WE THEN PICKED UP THE TFC VISUALLY AND AVOIDED CONFLICT AS HE PASSED UNDER OUR NOSE ON A N HDG. THE TFC APPEARED TO BE A LOW WING SINGLE ENG RECIPROCATING ACFT. WE THEN RPTED THE TFC TO STL TWR BECAUSE WE HAD JUST SWITCHED TO TWR FREQ. I BELIEVE THE ACFT HAD STRAYED INTO THE STL CLASS B, PROBABLY WITH A BAD XPONDER.
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.