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An air carrier large transport climbed in response to a TCASII command. This caused less than standard separation with another aircraft.
| Attributes | |
| ACN | 249920 |
| Time | |
| Date | 199308 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl |
| State Reference | GA |
| Altitude | msl bound lower : 5000 msl bound upper : 5500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : atl |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 15000 flight time type : 8000 |
| ASRS Report | 249920 |
| 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 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 : 13000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Radar vector IFR, in and out of clouds. TCASII gave a 'traffic' warning. Dropped TCASII scale to 5 NM and saw target level at our altitude, 12 O'clock position, and closing rapidly. Told first officer, who was flying, to turn away from target. Before he could turn, TCASII gave a 'climb, climb' warning. We immediately followed the TCASII instructions and narrowly missed another airliner. We were on altitude, airspeed, and heading and, to the best of my knowledge, did nothing to cause this near miss. It appeared to be controller error.
Original NASA ASRS Text
Title: AN ACR LGT CLBED IN RESPONSE TO A TCASII COMMAND. THIS CAUSED LTSS WITH ANOTHER ACFT.
Narrative: RADAR VECTOR IFR, IN AND OUT OF CLOUDS. TCASII GAVE A 'TFC' WARNING. DROPPED TCASII SCALE TO 5 NM AND SAW TARGET LEVEL AT OUR ALT, 12 O'CLOCK POS, AND CLOSING RAPIDLY. TOLD FO, WHO WAS FLYING, TO TURN AWAY FROM TARGET. BEFORE HE COULD TURN, TCASII GAVE A 'CLB, CLB' WARNING. WE IMMEDIATELY FOLLOWED THE TCASII INSTRUCTIONS AND NARROWLY MISSED ANOTHER AIRLINER. WE WERE ON ALT, AIRSPD, AND HDG AND, TO THE BEST OF MY KNOWLEDGE, DID NOTHING TO CAUSE THIS NEAR MISS. IT APPEARED TO BE CTLR ERROR.
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.