<< >> NASA ASRS Report 1058011, December 2012

Hawker 800XP pilot reported encountering extreme clear air turbulence at FL370 that resulted in temporary loss of control of the aircraft.

Attributes
ACN	1058011
Time
Date	201212
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 30 Flight Crew Total 7800 Flight Crew Type 2500
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

Cruising at 37;000 ft experienced severe to extreme clear air turbulence. We had 1;000 ft altitude loss; speed increased 30 KTS and aircraft banked 30-60 [degrees] to the left. Aircraft then gained 1;500 ft; airspeed decreased to 60-80 KTS with a violent roll to the right. Regained control of the aircraft and reestablished airspeed and altitude. ATC was notified. Once the aircraft was stable I went to the back to checkout the airplane and to re-stow all of the items that were thrown about the cabin.

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Original NASA ASRS Text

Title: Hawker 800XP pilot reported encountering extreme clear air turbulence at FL370 that resulted in temporary loss of control of the aircraft.

Narrative: Cruising at 37;000 FT experienced severe to extreme clear air turbulence. We had 1;000 FT altitude loss; speed increased 30 KTS and aircraft banked 30-60 [degrees] to the left. Aircraft then gained 1;500 FT; airspeed decreased to 60-80 KTS with a violent roll to the right. Regained control of the aircraft and reestablished airspeed and altitude. ATC was notified. Once the aircraft was stable I went to the back to checkout the airplane and to re-stow all of the items that were thrown about the cabin.

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.