Narrative:

Encountered severe turbulence in mtn wave. There was no warning or visual cue such as lenticular clouds. Had airspeed fluctuations in excess of 100 KTS and loss of 1000 ft altitude. No injuries, but could have as seatbelt sign was off. Need some kind of detection and warning for this severe turbulence before it causes an accident!

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Original NASA ASRS Text

Title: ACR LGT ENCOUNTERED SEVERE CLEAR AIR TURBULENCE WEST OF DEN IN MOUNTAIN WAVE.

Narrative: ENCOUNTERED SEVERE TURBULENCE IN MTN WAVE. THERE WAS NO WARNING OR VISUAL CUE SUCH AS LENTICULAR CLOUDS. HAD AIRSPD FLUCTUATIONS IN EXCESS OF 100 KTS AND LOSS OF 1000 FT ALT. NO INJURIES, BUT COULD HAVE AS SEATBELT SIGN WAS OFF. NEED SOME KIND OF DETECTION AND WARNING FOR THIS SEVERE TURBULENCE BEFORE IT CAUSES AN ACCIDENT!

Data retrieved from NASA's ASRS site as of August 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.