Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 160; Flight Crew Type 2607
ATC Issue All Types; Conflict Airborne Conflict
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Took Evasive Action; Flight Crew Executed Go Around / Missed Approach
Environment - Non Weather Related; Procedure
On approach to ILS PRM (Precision Runway Monitor) Runway 10C; at 9;000 feet MSL and given a vector to intercept LOC 10C and slow to 170 knots at approximately 30NM. We were set up and briefed for the PRM approach. ATC appeared busy and saturated. As we continued getting closer we queried Approach Control about approach clearance. We were handed off to Tower; checked in at 9;000 feet and requested approach clearance and were told 'continue'. Tower also seemed busy. We were still at 9;000 feet at around 16NM; queried again; and were given approach clearance and slow to 160 kts. We fully configured to attempt to slow down while descending to intercept the glide slope. We intercepted the glide slope at 160 kts. in landing configuration prior to RAYYY at 3;000 ft. MSL but were told to 'go around for wake turbulence'. We executed an uneventful missed approach and were vectored to an ILS 9L.
First Officer reported executing an ATC-directed go-around at ORD when wake spacing was lost.