Flight Crew Last 90 Days 217
Aircraft Equipment Problem Less Severe
Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach; General Maintenance Action
Aircraft; Environment - Non Weather Related
Landing on Runway 12R at STL yesterday in a B737-300; we got a windshear warning and initiated a go-around. We went around the pattern and on our second approach we got the same warning. I directed my First Officer to land; and here's why: 1) Weather was VFR day with light winds; 2) Tower reported light winds on all of their instruments and no other reports of windshear; and 3) I also evaluated the highway configuration just short of the runway and felt that it was the main factor.After landing; we asked Maintenance to come to the jet and our Mechanic had the following to say: 1) We get bogus windshear warnings fairly often at STL; 2) Company at some time in the past had evaluated the situation to include some test flights. No idea what their conclusions were; and 3) He was confident it was not a malfunctioning system on our aircraft.Evaluate the windshear system for its tendencies to give false windshear warnings when highway traffic is present near the approach to a runway. Share any pertinent findings with the Pilot Group. Add a note to our STL briefing page.
B737-300 Captain experiences a windshear warning during approach to Runway 12R at STL on a calm VMC day; and goes around. The next approach produces the same warning; but the approach is continued to landing. Highway traffic on final is thought to be the cause.