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Captain of air carrier widebody transport claims he got a false TCASII target while in cruise at FL350.
| Attributes | |
| ACN | 181036 |
| Time | |
| Date | 199106 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dbl |
| State Reference | CO |
| Altitude | msl bound lower : 35000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 3 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : j80 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 181036 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
A TCAS false target appeared at 10 O'clock (westbound on J80) and 20 mi with no altitude shown. ATC, denver center, had no such traffic when asked about it. No aural or visibility TA or RA and target disappeared suddenly. His was an obvious false target display caused by unresolved bugs in the TCAS software.
Original NASA ASRS Text
Title: CAPT OF ACR WDB CLAIMS HE GOT A FALSE TCASII TARGET WHILE IN CRUISE AT FL350.
Narrative: A TCAS FALSE TARGET APPEARED AT 10 O'CLOCK (WBND ON J80) AND 20 MI WITH NO ALT SHOWN. ATC, DENVER CTR, HAD NO SUCH TFC WHEN ASKED ABOUT IT. NO AURAL OR VIS TA OR RA AND TARGET DISAPPEARED SUDDENLY. HIS WAS AN OBVIOUS FALSE TARGET DISPLAY CAUSED BY UNRESOLVED BUGS IN THE TCAS SOFTWARE.
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.