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A DHC8 flight crew temporarily loses control of their aircraft and are ascended 700 ft while on the fringe of a non detected thunderstorm near mia, fl.
| Attributes | |
| ACN | 469550 |
| Time | |
| Date | 200004 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mia.airport |
| State Reference | FL |
| Altitude | msl bound lower : 3000 msl bound upper : 3700 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Turbulence Thunderstorm Rain Windshear |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mia.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8 Series Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 80 flight time total : 1800 flight time type : 55 |
| ASRS Report | 469550 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : turbulence inflight encounter : weather non adherence : clearance non adherence : required legal separation other anomaly |
| Independent Detector | other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : regained aircraft control flight crew : returned to assigned altitude flight crew : took precautionary avoidance action |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Weather Airspace Structure |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While being vectored for an approach at mia during intensive thunderstorm activity, last radar vector led our flight into a thunderstorm. We were at 3000 ft but upon entering the edge of the cell we encountered a strong updraft which pushed us up +/-700 ft. We then received a TA from the TCASII for traffic above us. Upon regaining vertical control of the plane we were able to descend back to 3000 ft. ATC also told us to expedite down to 3000 ft for traffic. After which I informed ATC of the current situation, and that the altitude deviation was due to a strong updraft beyond our control. WX caused this situation which could have been prevented if ATC had better radar equipment and could provide better vectors around WX instead of into it. Because ATC could not help us vector around the thunderstorm, we inadvertently entered it, resulting in an altitude gain beyond our control and a TA because of it. Crews and ATC should work together with each other's radar equipment to prevent such incidents, as our radar did not show the cell.
Original NASA ASRS Text
Title: A DHC8 FLC TEMPORARILY LOSES CTL OF THEIR ACFT AND ARE ASCENDED 700 FT WHILE ON THE FRINGE OF A NON DETECTED TSTM NEAR MIA, FL.
Narrative: WHILE BEING VECTORED FOR AN APCH AT MIA DURING INTENSIVE TSTM ACTIVITY, LAST RADAR VECTOR LED OUR FLT INTO A TSTM. WE WERE AT 3000 FT BUT UPON ENTERING THE EDGE OF THE CELL WE ENCOUNTERED A STRONG UPDRAFT WHICH PUSHED US UP +/-700 FT. WE THEN RECEIVED A TA FROM THE TCASII FOR TFC ABOVE US. UPON REGAINING VERT CTL OF THE PLANE WE WERE ABLE TO DSND BACK TO 3000 FT. ATC ALSO TOLD US TO EXPEDITE DOWN TO 3000 FT FOR TFC. AFTER WHICH I INFORMED ATC OF THE CURRENT SIT, AND THAT THE ALTDEV WAS DUE TO A STRONG UPDRAFT BEYOND OUR CTL. WX CAUSED THIS SIT WHICH COULD HAVE BEEN PREVENTED IF ATC HAD BETTER RADAR EQUIP AND COULD PROVIDE BETTER VECTORS AROUND WX INSTEAD OF INTO IT. BECAUSE ATC COULD NOT HELP US VECTOR AROUND THE TSTM, WE INADVERTENTLY ENTERED IT, RESULTING IN AN ALT GAIN BEYOND OUR CTL AND A TA BECAUSE OF IT. CREWS AND ATC SHOULD WORK TOGETHER WITH EACH OTHER'S RADAR EQUIP TO PREVENT SUCH INCIDENTS, AS OUR RADAR DID NOT SHOW THE CELL.
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.