AN SA227 TURBOPROP FLT ON BASE TO FINAL HAS AN NMAC WITH A STRAIGHT-IN CITATION JET AT 800 FT 2 MI SW OF RWY 4 AT ELD; AR.

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ON SEP/XA/00; WE WERE FLYING INTO ELD; WHEN WE HAD AN NMAC IN THE TFC PATTERN AT APPROX 800 FT AGL. WE WERE ON AN IFR FLT PLAN AS WAS THE OTHER PARTY INVOLVED. WE WERE BOTH TALKING TO ZFW ON 128.2; WHEN THE CAPT ELECTED TO CANCEL IFR AND PROCEED VFR TO ELD ARPT. WE ENTERED A L DOWNWIND FOR RWY 4; AND WERE MAKING POS RPTS ON ELD CTAF 123.0. THE CAPT AND I BOTH KNEW THAT THE CITATION'S DEST WAS ELD AND THAT IT WOULD BE APCHING STRAIGHT-IN TO RWY 4; AFTER HEARING HIM ON ZFW. THE CAPT HAD CANCELED OUR IFR FLT PLAN AND FLEW A FAST AND CLOSE PATTERN TO ATTEMPT TO ARRIVE BEFORE THE CITATION. TURNING L BASE TO FINAL WE RECEIVED A TA FROM TCASI; AND LOWERED THE R WING TO SEE THE CITATION AT THE SAME ALT WITH APPROX 200-300 FT OF HORIZ SEPARATION. WE IMMEDIATELY BANKED L AND THE CITATION TURNED R AND WENT MISSED TO ENTER THE TFC PATTERN FOR ANOTHER APCH. AT THIS POINT WE ESTABLISHED COM WITH THE CITATION; AND THE CAPT CONTINUED OUR APCH AT A STEEP ANGLE OF DSCNT AND HIGH AIRSPD. DUE TO THE DRAMATIC SINK RATE; THE GPWS ALERTED WITH INSTRUCTIONS TO 'PULL UP' 4 TIMES. WE TOUCHED DOWN APPROX 2000-3000 FT DOWN RWY 4 AND TAXIED TO THE RAMP. THE CITATION TOUCHED DOWN 3 MINS LATER. I BELIEVE THIS PROB WAS CAUSED BECAUSE WE WERE FORCED TO FLY A LARGE AND EXTENDED PATTERN ON THE PREVIOUS LEG DUE TO A MUCH SLOWER AIRPLANE; AND THE CAPT DID NOT WANT TO BE DELAYED A SECOND TIME. I THINK THAT THE CAPT WANTING TO GET HOME FASTER WAS ONE HUMAN FACTOR; AND OUR PERCEPTION OF THE AMOUNT OF TIME WE HAD ALONG WITH NOT CLRLY ESTABLISHING THE LOCATION AND SPD OF THE CITATION WERE OTHER FACTORS. THE CAPT HAD BEEN UP SINCE XA45 AND FLYING SINCE XC00 AND THIS MAY HAVE ALSO BEEN A FACTOR. I BELIEVE THE PROB AROSE BY US NOT COMMUNICATING WITH THE CITATION OR CTR OVER CTR FREQ BEFORE CANCELING IFR. BECAUSE WE WERE UNAWARE OF THE SPD AND DISTANCE OF THE CITATION DUE TO A LACK OF COM; WE HAD NO KNOWLEDGE OF THE PROB UNTIL THE TCASI ALERT ON THE BASE TO FINAL TURN. BOTH PLANES TOOK CORRECTIVE ACTION BY TURNING AWAY FROM EACH OTHER AND THE CONFLICT WAS RESOLVED WITHOUT ANY FURTHER PROBS. A RECURRENCE OF THIS EVENT CAN BE PREVENTED WITH BETTER COM.