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Air carrier X flight crew non adherence to ATC clearance descent from assigned altitude due to TCASII alert. Evasive action taken.
| Attributes | |
| ACN | 178422 |
| Time | |
| Date | 199105 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zma |
| State Reference | FL |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 178422 |
| 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 | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 18000 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X departed mia destination tpa. Aircraft requested interim altitude of 140 for WX. In the area of the mia 316 degree/030. Air carrier X called advising it had a TCAS alert and was descending. I observed data block already indicating 133 or 134. The traffic was a VFR aircraft descending sebound, opposite direction. I had observed the traffic passing approximately 3 mi east of air carrier X and had determined earlier that traffic was no factor.
Original NASA ASRS Text
Title: ACR X FLC NON ADHERENCE TO ATC CLRNC DSCNT FROM ASSIGNED ALT DUE TO TCASII ALERT. EVASIVE ACTION TAKEN.
Narrative: ACR X DEPARTED MIA DEST TPA. ACFT REQUESTED INTERIM ALT OF 140 FOR WX. IN THE AREA OF THE MIA 316 DEG/030. ACR X CALLED ADVISING IT HAD A TCAS ALERT AND WAS DSNDING. I OBSERVED DATA BLOCK ALREADY INDICATING 133 OR 134. THE TFC WAS A VFR ACFT DSNDING SEBOUND, OPPOSITE DIRECTION. I HAD OBSERVED THE TFC PASSING APPROX 3 MI E OF ACR X AND HAD DETERMINED EARLIER THAT TFC WAS NO FACTOR.
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.