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PIC of BA46 leaves FL230 for FL220 when TCASII paints an aircraft above and to the right. RA commands descent. ATC points out the traffic at 1000 ft below them at FL210. TCASII error.
| Attributes | |
| ACN | 362784 |
| Time | |
| Date | 199702 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sug |
| State Reference | NC |
| Altitude | msl bound lower : 22000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | BAe 146 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Cessna Citation Undifferentiated or Other Model |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 5000 flight time type : 500 |
| ASRS Report | 362784 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
At FL230 traffic on TCASII depicted on TCASII 45 degree right, up 1000 ft at 6 mi. Developed to RA and we followed respond to FL220 while informing ATC. Controller asked us to stay at FL220. Controller said traffic was to left and below, which was confirmed visually by PIC. Traffic was a cessna citation. Controller said TCASII gave an erroneous indication and should have equipment checked out. Equipment tested ok by crew when on ground afterward. I believe the TCASII has saved my life before, but this time it did not work properly. That is, the TCASII equipment almost caused a midair collision!
Original NASA ASRS Text
Title: PIC OF BA46 LEAVES FL230 FOR FL220 WHEN TCASII PAINTS AN ACFT ABOVE AND TO THE R. RA COMMANDS DSCNT. ATC POINTS OUT THE TFC AT 1000 FT BELOW THEM AT FL210. TCASII ERROR.
Narrative: AT FL230 TFC ON TCASII DEPICTED ON TCASII 45 DEG R, UP 1000 FT AT 6 MI. DEVELOPED TO RA AND WE FOLLOWED RESPOND TO FL220 WHILE INFORMING ATC. CTLR ASKED US TO STAY AT FL220. CTLR SAID TFC WAS TO L AND BELOW, WHICH WAS CONFIRMED VISUALLY BY PIC. TFC WAS A CESSNA CITATION. CTLR SAID TCASII GAVE AN ERRONEOUS INDICATION AND SHOULD HAVE EQUIP CHKED OUT. EQUIP TESTED OK BY CREW WHEN ON GND AFTERWARD. I BELIEVE THE TCASII HAS SAVED MY LIFE BEFORE, BUT THIS TIME IT DID NOT WORK PROPERLY. THAT IS, THE TCASII EQUIP ALMOST CAUSED A MIDAIR COLLISION!
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.