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Air carrier X TCASII RA climb had possible less than standard separation from aircraft Y. Possible system error. Evasive action taken.
| Attributes | |
| ACN | 249241 |
| Time | |
| Date | 199308 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : omn |
| State Reference | FL |
| Altitude | msl bound lower : 17000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | arrival other enroute airway : zjx |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 1500 |
| ASRS Report | 249241 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Air carrier X descending to 12000 ft bitho arrival to mco. Instructed to level off at 17000 ft for traffic avoidance. TCASII alerted us (RA) and commanded a climb, which we did. We advised ATC of our climb to 18000 ft and observed aircraft Y on our left. No evasive action given by ATC or notification by ATC. If not requested by ATC to level off at 17000 ft no evasive action would have been required by us.
Original NASA ASRS Text
Title: ACR X TCASII RA CLB HAD POSSIBLE LTSS FROM ACFT Y. POSSIBLE SYS ERROR. EVASIVE ACTION TAKEN.
Narrative: ACR X DSNDING TO 12000 FT BITHO ARR TO MCO. INSTRUCTED TO LEVEL OFF AT 17000 FT FOR TFC AVOIDANCE. TCASII ALERTED US (RA) AND COMMANDED A CLB, WHICH WE DID. WE ADVISED ATC OF OUR CLB TO 18000 FT AND OBSERVED ACFT Y ON OUR L. NO EVASIVE ACTION GIVEN BY ATC OR NOTIFICATION BY ATC. IF NOT REQUESTED BY ATC TO LEVEL OFF AT 17000 FT NO EVASIVE ACTION WOULD HAVE BEEN REQUIRED BY US.
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.