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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Miscellaneous situation in which TCASII did not display air carrier X and Y's target on the other's screen.
| Attributes | |
| ACN | 292048 |
| Time | |
| Date | 199412 |
| Day | Sat |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ord |
| State Reference | IL |
| Altitude | msl bound lower : 37000 msl bound upper : 41000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 6 controller radar : 4 |
| ASRS Report | 292048 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other other anomaly other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Above aircraft, a B757, air carrier X had visual identify on a company B757, air carrier Y, at FL370. However, both pilots of both aircraft reported their TCASII showed absolutely no traffic, even though TCASII was set to look plus or minus 99999 ft! Since both aircraft had same problem, I'd suspect TCASII has some sort of operational limitation or software error. Aircraft 4000 ft apart and 10 NM laterally.
Original NASA ASRS Text
Title: MISC SIT IN WHICH TCASII DID NOT DISPLAY ACR X AND Y'S TARGET ON THE OTHER'S SCREEN.
Narrative: ABOVE ACFT, A B757, ACR X HAD VISUAL IDENT ON A COMPANY B757, ACR Y, AT FL370. HOWEVER, BOTH PLTS OF BOTH ACFT RPTED THEIR TCASII SHOWED ABSOLUTELY NO TFC, EVEN THOUGH TCASII WAS SET TO LOOK PLUS OR MINUS 99999 FT! SINCE BOTH ACFT HAD SAME PROB, I'D SUSPECT TCASII HAS SOME SORT OF OPERATIONAL LIMITATION OR SOFTWARE ERROR. ACFT 4000 FT APART AND 10 NM LATERALLY.
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.