A task saturated CRJ-200 Captain lined up on a taxiway during an emergency approach with a 'FLAPS FAIL' CAS alert. On the next approach the aircraft did not capture the localizer and was hand flown on the ILS to a normal landing.

Narrative

We had planned a zero-flap landing to Runway XXR due to a Flaps Fail Caution message. I mistakenly lined up with Taxiway M during the approach. The First Officer recognized and called for a go-around at 300 FT AGL. We performed a go-around. Approach suggested Runway YYL (glide path available). We requested Runway YYL; however; Approach read back Runway XXL. We confirmed we needed Runway YYL for length. Again; the autopilot did not capture the LOC. I flew a raw data ILS and we broke out at 1;300 FT AGL. I was task saturated during the descent and approach phase of flight. The aircraft had a deferred FMS and we had to remind Center twice that we were on the arrival and could not go direct to Intersection X or Intersection Y. We declared an emergency and requested Runway XXR. However; the Final Approach Controller tried to assign us Runway XXL. We confirmed we needed the long runway for a zero-flap landing. The GS was out for Runway XXR and the weather was 1;300 FT broken. We briefed and planned a non precision approach. During the turn to final; the autopilot did not capture the LOC. I used heading mode to maintain courser. When we broke out at 1;300 FT AGL; we were above the PAPI glide path and slightly left of course. The First Officer called the approach lights in sight and I aligned the aircraft with what I perceived to be the runway centerline. The First Officer (pilot monitoring) continued to call the rate of descent and at approximately 300 FT noticed I was lined up with Taxiway M and called for a go-around. The new centerline lights for Taxiway M are easier to see than the runway lights. There were no aircraft on Taxiway M so the taxiway centerline lights were obstructed. I failed to crosscheck the LOC course after breaking out. I was more concerned with the glide path and speed for the zero-flap landing. I was task saturated due to the faster than normal approach speed for the zero-flap landing; clarification of ATC instructions; failure of the autopilot to capture the LOC; and a non precision approach at night. Supplemental information from ACN 823970: At FL190; we received a 'Flaps Fail' EICAS message; while descending through light to moderate turbulence. This aircraft had 2 previous flap failures in the recent Maintenance Log. Find and fix the problems causing flap failures on the CRJ200.