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Temporary loss of aircraft control and an altitude deviation as an EMB145 commuter on short final flies a missed approach due to a microburst alert from the tower at stl, mo.
| Attributes | |
| ACN | 552278 |
| Time | |
| Date | 200206 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : stl.airport |
| State Reference | MO |
| Altitude | agl single value : 700 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | Windshear Turbulence Thunderstorm |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : stl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach landing : go around |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 200 flight time total : 2800 flight time type : 500 |
| ASRS Report | 552278 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude inflight encounter : weather inflight encounter : turbulence non adherence : company policies non adherence : clearance other anomaly other anomaly other anomaly other |
| Independent Detector | atc equipment other atc equipment : windshear alert aircraft equipment other aircraft equipment : radar other flight crewa other flight crewb |
| Resolutory Action | controller : issued new clearance flight crew : regained aircraft control flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Weather Environmental Factor Flight Crew Human Performance |
| Primary Problem | Weather |
Narrative:
During visual approach in VMC, radar indicated a shower/thunderstorm north of the airport. At approximately 700 ft AGL tower alerted us to a microburst alert with wind gusts +/- 35 KTS. We initiated a go around and began a climb on runway heading to 3000 ft MSL -- as per the missed approach. We soon realized we were in an updraft -- the vsi indicated 7000 FPM -- and could not level off at 3000. The first officer alerted the tower of our situation and she issued a turn to 360 degrees. The first officer declined the heading, as it would have taken us into the storm. In the meantime, we had entered a downdraft -- the airspeed decreased from 230 KTS to 175 KTS and we quickly descended to around 2700 MSL. As we resumed a climb tower issued a turn to the south and a new altitude of 5000 ft. We held south of the field until the storm subsided and then made an uneventful landing.
Original NASA ASRS Text
Title: TEMPORARY LOSS OF ACFT CTL AND AN ALTDEV AS AN EMB145 COMMUTER ON SHORT FINAL FLIES A MISSED APCH DUE TO A MICROBURST ALERT FROM THE TWR AT STL, MO.
Narrative: DURING VISUAL APCH IN VMC, RADAR INDICATED A SHOWER/TSTM N OF THE ARPT. AT APPROX 700 FT AGL TWR ALERTED US TO A MICROBURST ALERT WITH WIND GUSTS +/- 35 KTS. WE INITIATED A GAR AND BEGAN A CLB ON RWY HDG TO 3000 FT MSL -- AS PER THE MISSED APCH. WE SOON REALIZED WE WERE IN AN UPDRAFT -- THE VSI INDICATED 7000 FPM -- AND COULD NOT LEVEL OFF AT 3000. THE FO ALERTED THE TWR OF OUR SIT AND SHE ISSUED A TURN TO 360 DEGS. THE FO DECLINED THE HDG, AS IT WOULD HAVE TAKEN US INTO THE STORM. IN THE MEANTIME, WE HAD ENTERED A DOWNDRAFT -- THE AIRSPD DECREASED FROM 230 KTS TO 175 KTS AND WE QUICKLY DESCENDED TO AROUND 2700 MSL. AS WE RESUMED A CLB TWR ISSUED A TURN TO THE S AND A NEW ALT OF 5000 FT. WE HELD S OF THE FIELD UNTIL THE STORM SUBSIDED AND THEN MADE AN UNEVENTFUL LNDG.
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.