NMAC BTWN CORP LTT AND HELI.

Narrative

I WAS DSNDING THE AIRPLANE INTO CLR VFR CONDITIONS AND WE VISUALLY ACQUIRED THE ARPT AT 8 MI TO OUR NW. WE WERE CLRED FOR THE VISUAL APCH AND HANDED OVER TO NEW ORLEANS LAKEFRONT TWR (NEW). TWR CLRED US TO LAND AND CALLED HELI TFC AT OUR 1 O'CLOCK POS. AS WE CONTINUED OUR DSCNT; LOOKING FOR THE TFC AND CONFIGURING OUR AIRPLANE TO LAND; I WAS A BIT FAST FOR OUR FLAP CONFIGN (PRIOR TO THEIR DEPLOYMENT). I TRADED SOME OF THE AIRSPD FOR ALT AS THE PNF VISUALLY IDENTED THE HELI. TWR AGAIN CALLED THE HELI'S POS AT OUR 11 O'CLOCK POS AT 800 FT AGL AT 1/4 MI FROM THE ARPT AND SAID THAT HE WOULD BE LNDG ON THE W RAMP. AS WE ADDED FULL FLAPS AND GEAR ON THE 2 MI FINAL THE AIRPLANE WAS HIGH ON THE VASI FOR RWY 36L; BUT OUR RAPID DSCNT RATE AT THE REDUCED PWR SETTING WAS SETTING THE AIRPLANE DOWN TO THE GS COURSE IN A TIMELY MANNER. NOW ON A 2 MI FINAL; WE BOTH SAW THE HELI AT 800 FT AGL COMING IN FROM OUR L AND APCHING OUR ACFT'S FLT PATH IN A STRAIGHT LINE VECTOR. HE WAS POSITIONED APPARENTLY TO BE IN CONFLICT WITH OUR LNDG. I ASKED THE PNF TO VERIFY WHERE THE HELI WAS HDG. WE WERE CLOSING RAPIDLY; AND THE TWR FREQ WAS CONGESTED WITH OTHER XMISSIONS. THE PNF SUGGESTED A GAR. AFTER ONE LAST BRIEF ASSESSMENT OF THE SIT; I DETERMINED THAT THE CONFLICT WAS INEVITABLE AND PROCEEDED THE GAR PROC. I WAS IRATE THAT THE CONFLICT WAS PERMITTED BY ATC AND THAT THEY SEEMED UNAWARE OF THE SIT THAT HAD UNFOLDED IN THE 5-10 SECOND PERIOD. AFTER OUR GAR; WE LANDED ON RWY 36L AND SAW THAT THE HELI HAD LANDED ON THE RAMP JUST L OF THE LNDG THRESHOLD. WE BOTH PERCEIVED THAT THE CONFLICT WAS REAL AND DEMANDED IMMEDIATE EVASIVE ACTION. THE SPACING; TIMELINESS AND SPD DIFFERENCES OF THE ACFT MADE THE PROC A SAFETY HAZARD.