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B737 flight crew overshot cleared altitude when severe turbulence encountered and control of aircraft lost.
| Attributes | |
| ACN | 569381 |
| Time | |
| Date | 200212 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : tpa.airport |
| State Reference | FL |
| Altitude | msl bound lower : 6000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | IMC |
| Weather Elements | Rain Turbulence other |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma.artcc tracon : tpa.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure : on vectors departure sid : tampa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 569381 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 569382 |
| Events | |
| Anomaly | altitude deviation : overshoot inflight encounter : turbulence inflight encounter : weather non adherence : clearance other anomaly |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : exited adverse environment flight crew : regained aircraft control flight crew : declared emergency other |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance Weather |
| Primary Problem | Environmental Factor |
Narrative:
Flight departed runway 18R in tpa, climbing to 12000 ft on a heading of 180 degrees. Copilot was hand flying aircraft and I was working ATC and radar. Approaching 10000 ft, we encountered moderate turbulence, which rapidly escalated to severe turbulence accompanied by very heavy precipitation. Copilot asked for help controling the aircraft and both of us were unable to level it off at 12000 ft. The aircraft was bouncing so hard that the instruments were impossible to read so I told the copilot to continue on and I attempted to declare an emergency. Was unable to get through initially, due to other radio traffic, and when I finally got through and declared the emergency, we were at approximately 13500 ft. I was immediately switched over to ZMA, re-declared the emergency with them and was cleared to FL230. 1 min or 2 later, we broke out of the worst of the WX, and was asked again about the emergency by ZMA. Since we appeared to be clear of the worst of it and the copilot was once more able to control the aircraft by herself, I told ZMA to cancel the emergency. The remainder of the flight was uneventful and postflt inspection of the aircraft by the copilot revealed no perceptible damage. Supplemental information from acn 569382: passing through 10000 ft, we encountered severe turbulence with heavy hail. Passing through FL180, this turbulence subsided. The captain entered the event into the maintenance logbook.
Original NASA ASRS Text
Title: B737 FLC OVERSHOT CLRED ALT WHEN SEVERE TURB ENCOUNTERED AND CTL OF ACFT LOST.
Narrative: FLT DEPARTED RWY 18R IN TPA, CLBING TO 12000 FT ON A HDG OF 180 DEGS. COPLT WAS HAND FLYING ACFT AND I WAS WORKING ATC AND RADAR. APCHING 10000 FT, WE ENCOUNTERED MODERATE TURB, WHICH RAPIDLY ESCALATED TO SEVERE TURB ACCOMPANIED BY VERY HVY PRECIP. COPLT ASKED FOR HELP CTLING THE ACFT AND BOTH OF US WERE UNABLE TO LEVEL IT OFF AT 12000 FT. THE ACFT WAS BOUNCING SO HARD THAT THE INSTS WERE IMPOSSIBLE TO READ SO I TOLD THE COPLT TO CONTINUE ON AND I ATTEMPTED TO DECLARE AN EMER. WAS UNABLE TO GET THROUGH INITIALLY, DUE TO OTHER RADIO TFC, AND WHEN I FINALLY GOT THROUGH AND DECLARED THE EMER, WE WERE AT APPROX 13500 FT. I WAS IMMEDIATELY SWITCHED OVER TO ZMA, RE-DECLARED THE EMER WITH THEM AND WAS CLRED TO FL230. 1 MIN OR 2 LATER, WE BROKE OUT OF THE WORST OF THE WX, AND WAS ASKED AGAIN ABOUT THE EMER BY ZMA. SINCE WE APPEARED TO BE CLR OF THE WORST OF IT AND THE COPLT WAS ONCE MORE ABLE TO CTL THE ACFT BY HERSELF, I TOLD ZMA TO CANCEL THE EMER. THE REMAINDER OF THE FLT WAS UNEVENTFUL AND POSTFLT INSPECTION OF THE ACFT BY THE COPLT REVEALED NO PERCEPTIBLE DAMAGE. SUPPLEMENTAL INFO FROM ACN 569382: PASSING THROUGH 10000 FT, WE ENCOUNTERED SEVERE TURB WITH HVY HAIL. PASSING THROUGH FL180, THIS TURB SUBSIDED. THE CAPT ENTERED THE EVENT INTO THE MAINT LOGBOOK.
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.