B737 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 9189; Flight Crew Type 5944
Communication Breakdown
Aircraft Equipment Problem Less Severe; Conflict Airborne Conflict; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Unstabilized Approach
Flight Crew Executed Go Around / Missed Approach; Flight Crew Returned To Clearance; Flight Crew Took Evasive Action
Aircraft; Human Factors
At ZZZZZ localizer XX approach ZZZ; received climb RA. Traffic showed red square -300. Went -200 and then -100 during our climb RA. We had 20 knot tailwind on approach. Became too high on approach and went around just over 500 AGL. I deselected the autobrakes by accident during the after takeoff checklist. Vectored back around; shot LOC XX again. Discovered autobrakes off on landing.
We were cleared for and flying the LOC RWY XX into ZZZ. We were on course and on the VNAV PATH approaching ZZZZZ. Just prior to ZZZZZ and our altitude of 4000 ft; a TCAS target suddenly (popped up) appeared 100 ft below us. We received a 'traffic' call followed immediately by a 'climb' RA. A substantial climb was directed from the RA guidance. The target showed 0 feet deviation from our altitude and at our location. The RA maneuver was performed without delay. Traffic was never seen. ATC was advised of the TCAS RA climb. ATC said there was no radar traffic in our vicinity. Just as suddenly as the target appeared it then disappeared. Could this have been a device other than another aircraft?ATC asked if we could still do the approach and we answer with the affirmative. As we were configuring; ATC slowed us to 170 knots. This added difficulty to get on the profile. We were on path but still fast approaching 500 ft radar altitude and a 'go around' was executed immediately. A 20 kt tailwind for the majority of the approach; a 170 kt speed assignment; along with our prior RA maneuver prevented us from being stable at 500 ft call. We were on path and about 20 kts above target. Upon landing it was discovered that the FO (First Officer) had deselected our autobrakes after our go around. It did not cross my mind to run another descent checklist.
B737 flight crew reported responding to a false RA; resulting in an unstable approach; go around; and inadvertent deselect of autobrakes.