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ZID controller described unknown 'intruder' target incident at approximately FL300; the target dropping shortly after being observed.
| Attributes | |
| ACN | 750094 |
| Time | |
| Date | 200708 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zid.artcc |
| State Reference | IN |
| Altitude | msl bound lower : 30000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 4 |
| ASRS Report | 750094 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : took evasive action |
| Supplementary | |
| Problem Areas | Navigational Facility |
| Primary Problem | Navigational Facility |
Narrative:
Aircraft was in climbing phase of flight from 300 ft MSL to FL330; when an intruder code merged with X. After I stopped the aircraft climb to FL320; the intruder target then turned south and dropped off my scope.
Original NASA ASRS Text
Title: ZID CTLR DESCRIBED UNKNOWN 'INTRUDER' TARGET INCIDENT AT APPROX FL300; THE TARGET DROPPING SHORTLY AFTER BEING OBSERVED.
Narrative: ACFT WAS IN CLBING PHASE OF FLT FROM 300 FT MSL TO FL330; WHEN AN INTRUDER CODE MERGED WITH X. AFTER I STOPPED THE ACFT CLB TO FL320; THE INTRUDER TARGET THEN TURNED S AND DROPPED OFF MY SCOPE.
Data retrieved from NASA's ASRS site as of January 2009 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.