B737-800 crew encountered severe windshear on approach. The aircraft had a flap overspd. The crew made a go around. Declared minimum fuel, and diverted to the nearest suitable airport.

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Attributes
ACN	601392
Time
Date	200311
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : geg.airport
State Reference	WA
Altitude	agl single value : 1300
Environment
Flight Conditions	VMC
Weather Elements	Turbulence Windshear
Light	Daylight
Aircraft 1
Controlling Facilities	tower : geg.tower
Operator	common carrier : air carrier
Make Model Name	B737-800
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 158 flight time total : 11160 flight time type : 1198
ASRS Report	601392
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter : turbulence inflight encounter : weather other anomaly other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : exited adverse environment flight crew : landed as precaution other
Consequence	other other other
Supplementary
Problem Areas	Weather Company
Primary Problem	Weather

Narrative:

Flight into geg. Release was no alternate. Scheduled to land with 7500 pounds of fuel. WX at geg 6000 ft overcast, 6 mi visibility, winds calm. There were no reports of turbulence or gusty winds. Vref 138 KTS, target speed 143 KTS. Only hint of possible windshear was a SIGMET we received with ZLC for severe turbulence in mt, but not wa. Light to moderate turbulence on approach. Increased target to 148 KTS. On final at about 1500 ft AGL, airspeed dropped off in a gust to about 130 KTS and then immediately increased to about 165 KTS. Airspeed stabilized for about 10 seconds and then another gust hit. Airspeed dropped off instantaneously to about 128 KTS. Windshear recovery was initiated by PF (the copilot) and airspeed increased instantaneously to about 195 KTS. Predictive windshear warning received during go around. Directed to psc due to insufficient fuel to shoot another approach and still divert to psc. Declared 'minimum fuel' and landed with 3700 pounds of fuel in pasco. Wrote up flap overspd. Unable to continue to slc or geg due to crew duty day.

Original NASA ASRS Text

Title: B737-800 CREW ENCOUNTERED SEVERE WINDSHEAR ON APCH. THE ACFT HAD A FLAP OVERSPD. THE CREW MADE A GAR. DECLARED MINIMUM FUEL, AND DIVERTED TO THE NEAREST SUITABLE ARPT.

Narrative: FLT INTO GEG. RELEASE WAS NO ALTERNATE. SCHEDULED TO LAND WITH 7500 LBS OF FUEL. WX AT GEG 6000 FT OVCST, 6 MI VISIBILITY, WINDS CALM. THERE WERE NO RPTS OF TURB OR GUSTY WINDS. VREF 138 KTS, TARGET SPD 143 KTS. ONLY HINT OF POSSIBLE WINDSHEAR WAS A SIGMET WE RECEIVED WITH ZLC FOR SEVERE TURB IN MT, BUT NOT WA. LIGHT TO MODERATE TURB ON APCH. INCREASED TARGET TO 148 KTS. ON FINAL AT ABOUT 1500 FT AGL, AIRSPD DROPPED OFF IN A GUST TO ABOUT 130 KTS AND THEN IMMEDIATELY INCREASED TO ABOUT 165 KTS. AIRSPD STABILIZED FOR ABOUT 10 SECONDS AND THEN ANOTHER GUST HIT. AIRSPD DROPPED OFF INSTANTANEOUSLY TO ABOUT 128 KTS. WINDSHEAR RECOVERY WAS INITIATED BY PF (THE COPLT) AND AIRSPD INCREASED INSTANTANEOUSLY TO ABOUT 195 KTS. PREDICTIVE WINDSHEAR WARNING RECEIVED DURING GAR. DIRECTED TO PSC DUE TO INSUFFICIENT FUEL TO SHOOT ANOTHER APCH AND STILL DIVERT TO PSC. DECLARED 'MINIMUM FUEL' AND LANDED WITH 3700 LBS OF FUEL IN PASCO. WROTE UP FLAP OVERSPD. UNABLE TO CONTINUE TO SLC OR GEG DUE TO CREW DUTY DAY.

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.