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Erroneous TCASII RA sends air carrier medium large transport in evasive action descent to occupied altitude.
| Attributes | |
| ACN | 276710 |
| Time | |
| Date | 199407 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : cvg |
| State Reference | OH |
| Altitude | msl bound lower : 10200 msl bound upper : 11000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : cvg |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military |
| Operating Under FAR Part | other : other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 15000 flight time type : 10000 |
| ASRS Report | 276710 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 500 vertical : 100 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were level at 11000 ft MSL inbound to cvg VOR. We received a TA and were unable to identify the aircraft causing the advisory. TCASII indicated the traffic was 500 ft below our altitude and 5 mi at 12 O'clock. While I was looking for the aircraft the TCASII issued an RA and command to descend at approximately 3000-3500 FPM. After a descent of 800 ft TCASII issued a climb command. I did see an aircraft pass approximately 100 ft below and 500 ft to our left. The aircraft appeared to be a navy jet (orange and white). The controller at cvg approach was not aware of the traffic.
Original NASA ASRS Text
Title: ERRONEOUS TCASII RA SENDS ACR MLG IN EVASIVE ACTION DSCNT TO OCCUPIED ALT.
Narrative: WE WERE LEVEL AT 11000 FT MSL INBOUND TO CVG VOR. WE RECEIVED A TA AND WERE UNABLE TO IDENT THE ACFT CAUSING THE ADVISORY. TCASII INDICATED THE TFC WAS 500 FT BELOW OUR ALT AND 5 MI AT 12 O'CLOCK. WHILE I WAS LOOKING FOR THE ACFT THE TCASII ISSUED AN RA AND COMMAND TO DSND AT APPROX 3000-3500 FPM. AFTER A DSCNT OF 800 FT TCASII ISSUED A CLB COMMAND. I DID SEE AN ACFT PASS APPROX 100 FT BELOW AND 500 FT TO OUR L. THE ACFT APPEARED TO BE A NAVY JET (ORANGE AND WHITE). THE CTLR AT CVG APCH WAS NOT AWARE OF THE TFC.
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.