Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 180
Confusion; Situational Awareness
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Air Traffic Control Separated Traffic; Flight Crew Returned To Clearance
Airspace Structure; Procedure; Human Factors; Environment - Non Weather Related
Upon checking on with ATL approach; we were told to expect Runway 9R. Our initial brief was for Runway 8L because that is the typical Runway assignment when flying the CHPPR arrival. The FO (First Officer) briefed the Runway change. A subsequent Approach Controller cleared us to descend via the arrival and also that we were cleared for the ILS PRM [Precision Runway Monitor] Runway 9R approach. We had to again brief for the PRM approach because they were not advertising PRM's in the ATIS. We got a little behind the airplane and approach asked to start our descent and then handed us off to Tower. I can't recall if we were given a speed to maintain to the 5-mile fix. I checked on with ATL Tower and we were cleared to land on approximately 8-10 mile final. I recall the Approach Controller on the monitor frequency asking the aircraft behind us to slow to final approach speed. Less than a minute later; at about 1;200 feet. AGL; Tower instructed us to discontinue the approach; climb to 4;000 feet; and gave us headings. We maintained normal and stable approach at all times. We were told that the reason was because we slowed to our final approach speed at around a 6-mile final. I assumed then that we had insufficient spacing with the aircraft behind us. We were vectored for the same approach which concluded normally.We had an apparent loss of spacing on final approach which resulted in ATC cancelling our approach clearance. We were task saturated with Runway and approach changes; and with ATC instructions. We began to slow to our final approach speed sooner than ATC anticipated. We could have better anticipated the sequence of events when transitioning from the arrival to the approach.
Air carrier Captain reported ATC re-sequenced them because they slowed to final approach speed at around a 6-mile final inbound to ATL.