Fokker 100 encountered severe turbulence where ATC had reported only occasional light chop. No passe...

Attributes
ACN	364777
Time
Date	199703
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : tul
State Reference	OK
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc tracon : ind
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	364777
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : weather inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Level at FL290, after ATC informed us this would be the best ride, mostly smooth with only occasional light chop, I turned seat belt sign off after about 20 mins. Just north of tul VOR, encountered unexpected and unrpted severe turbulence. I immediately turned on seat belt sign and requested immediate descent to lower altitude. Leveled at FL240 where it was smooth. No flight attendants or passenger were injured. Reported event to ATC, and then to dispatch. Continued to msp uneventfully.

Original NASA ASRS Text

Title: FOKKER 100 ENCOUNTERED SEVERE TURB WHERE ATC HAD RPTED ONLY OCCASIONAL LIGHT CHOP. NO PAX OR CREW INJURED.

Narrative: LEVEL AT FL290, AFTER ATC INFORMED US THIS WOULD BE THE BEST RIDE, MOSTLY SMOOTH WITH ONLY OCCASIONAL LIGHT CHOP, I TURNED SEAT BELT SIGN OFF AFTER ABOUT 20 MINS. JUST N OF TUL VOR, ENCOUNTERED UNEXPECTED AND UNRPTED SEVERE TURB. I IMMEDIATELY TURNED ON SEAT BELT SIGN AND REQUESTED IMMEDIATE DSCNT TO LOWER ALT. LEVELED AT FL240 WHERE IT WAS SMOOTH. NO FLT ATTENDANTS OR PAX WERE INJURED. RPTED EVENT TO ATC, AND THEN TO DISPATCH. CONTINUED TO MSP UNEVENTFULLY.

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

Fokker 100 encountered severe turbulence where ATC had reported only occasional light chop. No passenger or crew injured.