Narrative:

At 45000 feet 50 miles southwest of lar VOR we encountered severe turbulence. It started with moderate mountain waves that took us up to 45200 feet then down to 44700; with this happening twice in succession. The airspeed fluctuated from mach .80 to .77 or so. This lasted for about a minute. About a minute in we were hit with a 2-3 second burst of severe turbulence. The airplane banked to the right 30 degrees rapidly; at which point I switched off the autopilot. Though I had control of the plane it rapidly went to mach .74 even though I had the nose down and we lost about 500 feet. Initially as this happened we got the 'stall' aural warning; though we got no stick shaker and it didn't come close to any kind of stall. After a few seconds the turbulence went to moderate then light; I had full control of the airplane and we got back up to 45000 feet. We requested lower and got down to 43000 feet where I put it back on autopilot. I went back to check on our passenger and reassure him. He seemed fine; a little nervous but overall ok. Conditions were clear; total VFR and no convective activity anywhere. The airplane weight was 31500 pounds and it was isa -4c; well within performance parameters for 45000 feet in the cl-350. The only reports of turbulence in the area was for light turbulence. The release shear report for the lar area was 1. Just a case of clear air turbulence with mountain waves. As the PIC I included is the shear report for the flight.

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Original NASA ASRS Text

Title: Bombardier Challenger Captain reported encountering severe turbulence that resulted in speed deviations and momentary altitude excursions.

Narrative: At 45000 feet 50 miles southwest of LAR VOR we encountered severe turbulence. It started with moderate mountain waves that took us up to 45200 feet then down to 44700; with this happening twice in succession. The airspeed fluctuated from Mach .80 to .77 or so. This lasted for about a minute. About a minute in we were hit with a 2-3 second burst of severe turbulence. The airplane banked to the right 30 degrees rapidly; at which point I switched off the autopilot. Though I had control of the plane it rapidly went to Mach .74 even though I had the nose down and we lost about 500 feet. Initially as this happened we got the 'Stall' aural warning; though we got no stick shaker and it didn't come close to any kind of stall. After a few seconds the turbulence went to moderate then light; I had full control of the airplane and we got back up to 45000 feet. We requested lower and got down to 43000 feet where I put it back on autopilot. I went back to check on our passenger and reassure him. He seemed fine; a little nervous but overall ok. Conditions were clear; total VFR and no convective activity anywhere. The airplane weight was 31500 pounds and it was ISA -4c; well within performance parameters for 45000 feet in the CL-350. The only reports of turbulence in the area was for light turbulence. The release shear report for the LAR area was 1. Just a case of clear air turbulence with mountain waves. As the PIC I included is the shear report for the flight.

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.