Light transport commuter turboprop encountered moderate to severe turbulence on approach to okc.

Attributes
ACN	422360
Time
Date	199812
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : okc
State Reference	OK
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Navigation In Use	Other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 110 flight time total : 5000 flight time type : 110
ASRS Report	422360
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	inflight encounter : weather
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On the descent into okc, approach control warned of possible windshear. Approach also advised that a previous B737 had reported moderate to severe turbulence on base leg. We were receiving vectors for an ILS to runway 17L in okc. Just prior to base, we were advised that the airport was being turned around and we were issued a left turn to a south heading for a downwind to runway 35R. Turning through 260 degree heading we encountered severe turbulence. We continued the turn to an east heading and escaped the shear. Prior to entering the turbulence the flight was in smooth conditions. My inaction of continuing an approach with the report of severe turbulence by a B737 led to the encounter.

Original NASA ASRS Text

Title: LTT COMMUTER TURBOPROP ENCOUNTERED MODERATE TO SEVERE TURB ON APCH TO OKC.

Narrative: ON THE DSCNT INTO OKC, APCH CTL WARNED OF POSSIBLE WINDSHEAR. APCH ALSO ADVISED THAT A PREVIOUS B737 HAD RPTED MODERATE TO SEVERE TURB ON BASE LEG. WE WERE RECEIVING VECTORS FOR AN ILS TO RWY 17L IN OKC. JUST PRIOR TO BASE, WE WERE ADVISED THAT THE ARPT WAS BEING TURNED AROUND AND WE WERE ISSUED A L TURN TO A S HDG FOR A DOWNWIND TO RWY 35R. TURNING THROUGH 260 DEG HDG WE ENCOUNTERED SEVERE TURB. WE CONTINUED THE TURN TO AN E HDG AND ESCAPED THE SHEAR. PRIOR TO ENTERING THE TURB THE FLT WAS IN SMOOTH CONDITIONS. MY INACTION OF CONTINUING AN APCH WITH THE RPT OF SEVERE TURB BY A B737 LED TO THE ENCOUNTER.

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.