Narrative:

We were on the downwind at 7000 ft descending to 4000 ft (I think) when we were vectored into severe thunderstorm cells. We were assigned a speed of 170 and had flaps 20 selected. Once inside the thunderstorm we encountered severe wind shear with lightning all around us (don't know if we were hit). The airspeed must have fluctuated almost a 100 kts and we went several times from stick shaker into overspeed by about 20 +/- with bank angle up to 40-45 degrees while in a turn on autopilot out of the thunderstorm cell. We could not maintain the assigned speed due to the severe wind shear airspeed fluctuations. Several times we had to advance full pwr (power) to keep the speed out of the stick shaker. We did not want to do a wind shear escape maneuver to avoid flying deeper into the cell. We could see the clear area ahead of us on the nav (navigation) display hence we decided to keep turning and after 10 to 20 seconds we were out of it. We wrote up the overspeed (10-20kts) for the selected flap setting of 20 degrees and possible lightning strikes.we asked the controller to give us a right turn in less than 2 miles but she turned us just about a mile or 2 too late. Approach in the clear and landing were uneventful. The flight in front of us must have encountered similar weather and told ATC not to let anybody go as far on the downwind. ATC should have had more spacing between flights to allow a turn short of the thunderstorm cell.

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Original NASA ASRS Text

Title: B767-300 flight crew reports being vectored into a thunderstorm during approach after requesting that the storm be avoided. Previous aircraft had reported severe turbulence and this crew reported stick shaker and flap overspeed along with bank angles to 40 degrees before exiting.

Narrative: We were on the downwind at 7000 ft descending to 4000 ft (I think) when we were vectored into severe thunderstorm cells. We were assigned a speed of 170 and had flaps 20 selected. Once inside the thunderstorm we encountered severe wind shear with lightning all around us (don't know if we were hit). The airspeed must have fluctuated almost a 100 kts and we went several times from stick shaker into overspeed by about 20 +/- with bank angle up to 40-45 degrees while in a turn on autopilot out of the thunderstorm cell. We could not maintain the assigned speed due to the severe wind shear airspeed fluctuations. Several times we had to advance full pwr (Power) to keep the speed out of the stick shaker. We did not want to do a wind shear escape maneuver to avoid flying deeper into the cell. We could see the clear area ahead of us on the nav (Navigation) display hence we decided to keep turning and after 10 to 20 seconds we were out of it. We wrote up the overspeed (10-20kts) for the selected flap setting of 20 degrees and possible lightning strikes.We asked the Controller to give us a right turn in less than 2 miles but she turned us just about a mile or 2 too late. Approach in the clear and landing were uneventful. The flight in front of us must have encountered similar weather and told ATC not to let anybody go as far on the downwind. ATC should have had more spacing between flights to allow a turn short of the thunderstorm cell.

Data retrieved from NASA's ASRS site 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.