<< >> NASA ASRS Report 1077716, March 2013

Erj-170 captain reported stick shaker and inability to maintain altitude at FL370 in severe turbulence.

Attributes
ACN	1077716
Time
Date	201303
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	EMB ERJ 170/175 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence

Narrative:

Twenty minutes into the flight; reaching FL370; and on top of the last cloud layer; we encountered turbulence that became severe. Wind shear plus up and down drafts activated the shaker momentarily disconnecting the autopilot. First officer maintained level attitude and second shaker activation followed; there were just seconds between the two shaker activations. We descended with a downdraft 3;500 feet leveling at FL330. All this time; we were in contact with center and I notified them of our inability to maintain altitude.

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Original NASA ASRS Text

Title: ERJ-170 Captain reported stick shaker and inability to maintain altitude at FL370 in severe turbulence.

Narrative: Twenty minutes into the flight; reaching FL370; and on top of the last cloud layer; we encountered turbulence that became severe. Wind shear plus up and down drafts activated the shaker momentarily disconnecting the autopilot. First Officer maintained level attitude and second shaker activation followed; there were just seconds between the two shaker activations. We descended with a downdraft 3;500 feet leveling at FL330. All this time; we were in contact with Center and I notified them of our inability to maintain altitude.

Data retrieved from NASA's ASRS site as of July 2013 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.