Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 95; Flight Crew Total 611; Flight Crew Type 611
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Air Traffic Control Provided Assistance; Flight Crew Executed Go Around / Missed Approach; General Flight Cancelled / Delayed
Procedure
We were cleared for an ILS to Runway 16R. Spacing was 5 miles behind Aircraft Y. ATC assigned a speed reduction to 170 kts. A further speed reduction to 150 kts was assigned. Traffic separation was 3 miles. Our target speed was 152 kts. We were cleared to land. I saw Aircraft Y fail to make the 2nd high speed exit and informed the First Officer that 'it was not looking good'. I started the go around at approximately 150 ft. The First Officer radioed the go around to Tower. There was a significant pause before ATC responded and they seemed surprised we were going around. We over flew Aircraft Y on Runway 16R. We were vectored around for a visual approach to Runway 16L. A normal landing ensued. After exiting the runway; ATC informed us there would be an investigation launched regarding the go around. My assumption is that the controller forgot about Aircraft Y on the runway which is why there was confusion as to what we were going around. Aircraft Y rolled long for unknown reasons and likely caught the Controller off guard due to an unexpected maneuver.
B737 Captain reported that an aircraft failed to vacate the runway; resulting in a go around.