King Air C90 E90
Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 50; Flight Crew Total 2250; Flight Crew Type 40
Situational Awareness; Confusion
Aircraft Equipment Problem Less Severe
Flight Crew Executed Go Around / Missed Approach; Flight Crew Overcame Equipment Problem; Flight Crew Became Reoriented
Aircraft
During two previous approaches; the Co-Captain and I had executed a missed approach due to a TAWS [Terrain Awareness Warning System] warning on ILS 32 into BBG.  We were completely stabilized and on profile with a normal descent rate.  Approximately 400 feet above minimums; we received the TAWS warning and executed the missed approach per the AFM and company policies and procedures.  After 3 previous aircraft had successfully negotiated the ILS approach to land under 1 SM and 500 feet OVC conditions; we elected to inhibit the TAWS terrain feature.  We landed safely and uneventfully at BBG on the third approach attempt. In hindsight; disabling the TAWS was not a prudent decision.  While we were confident that the database may have been out of date due to the relatively recent construction of the airport (2009); we had no way of ensuring it was not other equipment that was faulty or programmed incorrectly.
King Air flight crew experiences two consecutive TAWS alerts during two ILS 32 approaches into BBG resulting in go arounds. Other aircraft are successfully landing off the ILS 32 approach; so the TAWS is disabled and the third approach is successful.