AN ACR FK10 FLC RESPONDS PROPERLY TO AN RA BY CLBING ABOVE THEIR ASSIGNED ALT TO AVOID A BH12.

Narrative

WHILE BEING VECTORED TO AND ON A L DOWNWIND FOR RWY 17L AT OKC; ARRIVING FROM THE SSE; WE RECEIVED ACFT; ABOVE; BELOW; AND LEVEL WITH US. AIRSPACE WAS SATURATED AT THIS TIME. WHEN APPROX ABEAM THE RWY 17L TOUCHDOWN ZONE; WE ALSO OBSERVED A TWIN CESSNA TRACKING TOWARDS WILEY POST FIELD; CUTTING ACROSS BOTH FINALS AT WILL ROGERS WORLD ARPT; IN ADDITION TO MANY OTHER ACFT IN THE AREA. ABOUT THIS TIME; I; PNF; SPOTTED WHAT APPEARED TO BE AN OH58/JETRANGER AT OUR 12 O'CLOCK POS AND LEVEL; LESS THAN 1 MI AHEAD. I IMMEDIATELY REFED THE TCASII DISPLAY AS THE ACFT WENT TO AMBER/WITH A -300 FT ALT READOUT; AND WE THEN RECEIVED AN RA TO CLB. THE FO; PF; IMMEDIATELY REACTED AS TRAINED AND CLBED UP FROM OUR 4000 FT ASSIGNED TO APPROX 4300 FT. THE TCASII THEN ISSUED A MONITOR VERT SPD COMMAND FOLLOWED IMMEDIATELY BY A CLR OF CONFLICT ADVISORY. I RPTED TO ATC DURING THE RA THAT WE HAD AN RA AND HE EMPHATICALLY COMMANDED US THAT WE DID NOT NEED TO FOLLOW IT AS THE ACFT WAS 500 FT BELOW US. I REPLIED THAT WE WERE COMPLYING WITH THE RA. IT APPEARED THAT JUST AS WE WERE STARTING TO FOLLOW THE RA THAT THE HELI TURNED DIRECTLY TOWARDS US AND ENTERED AUTOROTATION; OR A VERY RAPID DSCNT DROPPING UNDER THE NOSE OF OUR ACFT. IN DEFENSE OF ATC; THE AIRSPACE WAS REALLY A MESS AT THIS TIME; AS THERE WERE MANY VFR AND MIXED TYPE ACFT IN THE AREA AT THIS TIME. THE ONLY TA WE RECEIVED.