B737 flight crew encounters windshear during approach to sjc and diverts to oak.

Attributes
ACN	568346
Time
Date	200212
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sjc.airport
State Reference	CA
Altitude	agl single value : 100
Environment
Weather Elements	Windshear Turbulence
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sjc.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
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 type : 1273
ASRS Report	568346
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	inflight encounter : weather inflight encounter other other anomaly
Independent Detector	aircraft equipment : gpws other flight crewa other flight crewb
Resolutory Action	flight crew : regained aircraft control flight crew : executed go around flight crew : diverted to another airport
Supplementary
Problem Areas	Weather
Primary Problem	Weather

Narrative:

During descent into sjc, encountered moderate turbulence on downwind, being vectored to ILS runway 12 sjc. Winds were 160 degrees 77 KTS at 6000 ft. Moderate turbulence continued throughout the approach, and a go around was executed at about 100 ft AGL for inability to maintain adequate control of the aircraft for landing. A subsequent approach and go around were executed for GPWS windshear warning on short final. Fuel was now approximately 5400 pounds less than fleet planned landing fuel, and we now needed to divert to our alternate airport, which was experiencing similar conditions, as were all the other airports in the bay area. We declared an emergency for low fuel, and diverted to oak. We shut down the engines at oak west 4000 ft.

Original NASA ASRS Text

Title: B737 FLC ENCOUNTERS WINDSHEAR DURING APCH TO SJC AND DIVERTS TO OAK.

Narrative: DURING DSCNT INTO SJC, ENCOUNTERED MODERATE TURB ON DOWNWIND, BEING VECTORED TO ILS RWY 12 SJC. WINDS WERE 160 DEGS 77 KTS AT 6000 FT. MODERATE TURB CONTINUED THROUGHOUT THE APCH, AND A GAR WAS EXECUTED AT ABOUT 100 FT AGL FOR INABILITY TO MAINTAIN ADEQUATE CTL OF THE ACFT FOR LNDG. A SUBSEQUENT APCH AND GAR WERE EXECUTED FOR GPWS WINDSHEAR WARNING ON SHORT FINAL. FUEL WAS NOW APPROX 5400 LBS LESS THAN FLEET PLANNED LNDG FUEL, AND WE NOW NEEDED TO DIVERT TO OUR ALTERNATE ARPT, WHICH WAS EXPERIENCING SIMILAR CONDITIONS, AS WERE ALL THE OTHER ARPTS IN THE BAY AREA. WE DECLARED AN EMER FOR LOW FUEL, AND DIVERTED TO OAK. WE SHUT DOWN THE ENGS AT OAK W 4000 FT.

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.