A B737 captain reported encountering severe turbulence over powder on the powder 5 arrival to den; which kicked off the autopilot and rolled the aircraft 60 degrees.

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Attributes
ACN	811737
Time
Date	200811
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	msl single value : 19000
Aircraft 1
Controlling Facilities	tracon : d01.tracon
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : preflight
Route In Use	arrival star : powder
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 240 flight time total : 18000 flight time type : 3700
ASRS Report	811737
Events
Anomaly	inflight encounter : turbulence
Independent Detector	other flight crewa
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

Severe turbulence approaching FL190 over powder on the powder 5 arrival. Kicked the autoplt off. Aircraft rolled toward 60 degrees to the right. Reported moderate to severe turbulence to ATC.

Original NASA ASRS Text

Title: A B737 CAPTAIN REPORTED ENCOUNTERING SEVERE TURBULENCE OVER POWDER ON THE POWDER 5 ARRIVAL TO DEN; WHICH KICKED OFF THE AUTOPILOT AND ROLLED THE AIRCRAFT 60 DEGREES.

Narrative: SEVERE TURB APCHING FL190 OVER POWDER ON THE POWDER 5 ARR. KICKED THE AUTOPLT OFF. ACFT ROLLED TOWARD 60 DEGS TO THE R. RPTED MODERATE TO SEVERE TURB TO ATC.

Data retrieved from NASA's ASRS site as of May 2009 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.