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A B737 captain reported severe turbulence for 90 seconds at FL350 accompanied by +/-30 degree banks; a 1;000 ft uncommanded climb and a mach overspeed to .85. ATC cleared them to FL330 and into smooth air.
| Attributes | |
| ACN | 950770 |
| Time | |
| Date | 201105 |
| Place | |
| Locale Reference | ZOA.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 275 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Track / Heading All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence |
Narrative:
While cruising at FL350; aircraft encountered severe turbulence. Uncontrolled roll of +/-30 degree bank; mach overspeed to mach .85; and an uncommanded climb from FL350 to approximately FL360. We informed ATC that we were encountering severe turbulence and we were unable to maintain altitude. ATC gave us a descent to FL330. Exited turbulence area after about 90 seconds. No injuries and no loss of separation with other aircraft.
Original NASA ASRS Text
Title: A B737 Captain reported severe turbulence for 90 seconds at FL350 accompanied by +/-30 degree banks; a 1;000 FT uncommanded climb and a MACH overspeed to .85. ATC cleared them to FL330 and into smooth air.
Narrative: While cruising at FL350; aircraft encountered severe turbulence. Uncontrolled roll of +/-30 degree bank; MACH overspeed to MACH .85; and an uncommanded climb from FL350 to approximately FL360. We informed ATC that we were encountering severe turbulence and we were unable to maintain altitude. ATC gave us a descent to FL330. Exited turbulence area after about 90 seconds. No injuries and no loss of separation with other aircraft.
Data retrieved from NASA's ASRS site as of April 2012 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.