A B737 approaching to land at atl, GA, encounters a 30 KT windshear at 1200 ft AGL. Flight crew anticipates windshear and is ready to perform a go around if any signs of shear appear. An immediate go around is performed when windshear is encountered.

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Attributes
ACN	394220
Time
Date	199802
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	agl bound lower : 1200 agl bound upper : 1200
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : atl
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : commercial
Experience	flight time last 90 days : 185 flight time total : 6000 flight time type : 185
ASRS Report	394220
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Supplementary
Primary Problem	Weather
Air Traffic Incident	other

Narrative:

Thunderstorms in area, ride smooth, radar showed cell to right of course. Briefed approach, missed approach and windshear procedures, good thing. Inside marker on runway 9R slowing to 140 KTS, got red windshear light and aural warning. Firewall power and went around. Gave PIREP to tower. Approximately 30 KT loss of airspeed. Had a hard time talking to tower. Several aircraft went around. Switched to approach control on our own. Tower was not responding despite repeated calls. Came back around for another landing and uneventful shutdown. Tower needed to either switch us to approach or give vectors. Too much confusion.

Original NASA ASRS Text

Title: A B737 APCHING TO LAND AT ATL, GA, ENCOUNTERS A 30 KT WINDSHEAR AT 1200 FT AGL. FLC ANTICIPATES WINDSHEAR AND IS READY TO PERFORM A GAR IF ANY SIGNS OF SHEAR APPEAR. AN IMMEDIATE GAR IS PERFORMED WHEN WINDSHEAR IS ENCOUNTERED.

Narrative: TSTMS IN AREA, RIDE SMOOTH, RADAR SHOWED CELL TO R OF COURSE. BRIEFED APCH, MISSED APCH AND WINDSHEAR PROCS, GOOD THING. INSIDE MARKER ON RWY 9R SLOWING TO 140 KTS, GOT RED WINDSHEAR LIGHT AND AURAL WARNING. FIREWALL PWR AND WENT AROUND. GAVE PIREP TO TWR. APPROX 30 KT LOSS OF AIRSPD. HAD A HARD TIME TALKING TO TWR. SEVERAL ACFT WENT AROUND. SWITCHED TO APCH CTL ON OUR OWN. TWR WAS NOT RESPONDING DESPITE REPEATED CALLS. CAME BACK AROUND FOR ANOTHER LNDG AND UNEVENTFUL SHUTDOWN. TWR NEEDED TO EITHER SWITCH US TO APCH OR GIVE VECTORS. TOO MUCH CONFUSION.

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.