B737-700
Aircraft Equipment Problem Less Severe
Aircraft; Environment - Non Weather Related
At 500 FT on visual approach to [Runway] 22L at BOS received a windshear warning in completely calm and smooth air. Accomplished go-around and didn't get warning on exact same approach in exact same conditions.
A B737-700 on final approach to Runway 22L at BOS received a windshear alert on a clear; calm day. After executing a MAP the same approach was flown without incident.