B737-800
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Time Pressure
Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued New Clearance; Flight Crew Became Reoriented; Flight Crew Executed Go Around / Missed Approach
Human Factors
We had briefed and talked about flying an ILS to Runway 18R in MCO. We were at 3000 ft when Orlando Approach gave us an approximate 150 vector and told us to intercept final for 18R. This vector placed us outside of HAMMY (8.9 miles from the runway). I was the Pilot Flying and had the aircraft on autopilot and placed HAMMY on the top of the route and then extended the final approach course off the 185 radial. We were established on the vector in heading mode with VOR/LOC selected. When we got within a couple miles of HAMMY; Approach gave us a new vector; with a descent to 2200 ft and told us to intercept final. This course placed us between HAMMY and TUFFE; the FAF. There are only 2.5 miles separating the two points. I turned to approximately a 170 degree heading and began a level descent and then I tried to bring TUFFE to the top of the routing and extended final. However; I accidentally punched in HAMMY to the scratchpad. I tried to erase it and put in TUFFE but somehow managed to put in HTUFFE; which wouldn't load. I deleted that and put in TUFFE and extended the final. I placed us back in VOR/LOC but by this time the aircraft was too close to final that it could not intercept it without going through final. We slightly overshot final and then the autopilot made an aggressive right hand turn to correct causing us to go back through final and then another aggressive left hand turn to re-intercept. By this time we were overhead TUFFE. Approach stated that we were not established on final and gave us a turn to 270 degrees and a climb to 3000 ft. We performed a go-around to vectors back to intercept final (outside of HAMMY) and flew an uneventful ILS Approach to 18R.ATC's directions to vector us in between HAMMY and TUFFE came too late and wasn't necessary. There was minimal spacing and time to reprogram the box and because I fat fingered in the wrong point it put us even closer to final causing us to overshoot. I as the Pilot Flying also could have just placed us back into VOR/LOC instead of trying to reprogram the box since we compressed.
B737 First Officer reported improperly reloading the FMC when given a new vector for the MCO ILS 18R which resulted in an overshoot and a missed approach initiated by ATC.