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TCASII commanded a descent towards an aircraft that was below the reporting aircraft. Both aircraft made evasive turns.
| Attributes | |
| ACN | 224877 |
| Time | |
| Date | 199210 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 14400 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 13000 flight time type : 7000 |
| ASRS Report | 224877 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 2000 vertical : 500 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Our aircraft was level at 15000, heading 140 degrees assigned. Traffic was reported ahead at 14000 ft. TCASII displayed 1 symbol at 11-12 O'clock plus 17 altitude, closing rapidly. A TA was issued, then RA to descend immediately. Green arc on vsi was at 5000 FPM. Our aircraft descended to 14400 ft. An light transport was observed at 11 O'clock, opposite direction. Both aircraft made a right turn although a turn was not necessary to avoid a collision. We climbed back to 15000 and informed ATC (approach control). If one 1 aircraft was at our 11-12 O'clock, I believe TCASII issued an incorrect RA. No other aircraft was observed visually.
Original NASA ASRS Text
Title: TCASII COMMANDED A DSCNT TOWARDS AN ACFT THAT WAS BELOW THE RPTING ACFT. BOTH ACFT MADE EVASIVE TURNS.
Narrative: OUR ACFT WAS LEVEL AT 15000, HDG 140 DEGS ASSIGNED. TFC WAS RPTED AHEAD AT 14000 FT. TCASII DISPLAYED 1 SYMBOL AT 11-12 O'CLOCK PLUS 17 ALT, CLOSING RAPIDLY. A TA WAS ISSUED, THEN RA TO DSND IMMEDIATELY. GREEN ARC ON VSI WAS AT 5000 FPM. OUR ACFT DSNDED TO 14400 FT. AN LTT WAS OBSERVED AT 11 O'CLOCK, OPPOSITE DIRECTION. BOTH ACFT MADE A R TURN ALTHOUGH A TURN WAS NOT NECESSARY TO AVOID A COLLISION. WE CLBED BACK TO 15000 AND INFORMED ATC (APCH CTL). IF ONE 1 ACFT WAS AT OUR 11-12 O'CLOCK, I BELIEVE TCASII ISSUED AN INCORRECT RA. NO OTHER ACFT WAS OBSERVED VISUALLY.
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.