Narrative:

We were cleared by approach control to fly direct omoxi cleared for the ILS runway 7 at mkjs. WX at the field was reported 10 mi visibility to the east and less, 1-2 mi visibility to the west. We were inside the OM descending on the GS and on the localizer when I noticed traffic pop up on the TCASII slightly left of centerline between us and the runway. Descending below 1000 ft we got a TA. At around 700 ft the traffic was showing 300 ft below us and less than 1 mi. I told the captain this did not look good, I was going around. After starting the go around we received an RA and the traffic was 200 ft below us showing a climb. We executed the missed approach in navigation and flew the whole missed approach and climbed to the missed approach altitude of 3000 ft. On the missed approach we asked the controller what we almost hit. She said it was a C208 and he was not where he was supposed to have been. We executed the whole missed approach and was cleared for the same approach again with a successful landing. When on the ground I called the dispatcher and chief pilot. After discussing with them I called the tower. They told me the tail number of the C208. They told me that they talked to the pilot of the cessna and he said he had a visual on us. I told them how could he if we were IMC when the near miss occurred. Then they told me that he said his transponder was malfunctioning. He also told them he was 1 1/2 mi north of the final approach course. On the second approach we did not pick up the runway until we were at 600 ft. During the first approach we never saw the airport or runway and we were in very heavy rain and IMC the whole time. 2 passenger in first class did see the aircraft out of their windows on the left side of the aircraft. They were sitting in the 2 first rows of first class window seats. Supplemental information from acn 609960: flight attendant overheard a passenger in first class telling another he saw a small aircraft passing very close underneath us on the left side of the aircraft. Tower said they pulled the voice tapes. There is no doubt in my mind that this would have been a midair, if it was not for TCASII and the quick action of my first officer.

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Original NASA ASRS Text

Title: NMAC BTWN AN A300 IN AN ILS APCH TO RWY 7 AND A CLBING C208 NEAR THE LOC COURSE 2 NM SW OF MKJS, FO.

Narrative: WE WERE CLRED BY APCH CTL TO FLY DIRECT OMOXI CLRED FOR THE ILS RWY 7 AT MKJS. WX AT THE FIELD WAS RPTED 10 MI VISIBILITY TO THE E AND LESS, 1-2 MI VISIBILITY TO THE W. WE WERE INSIDE THE OM DSNDING ON THE GS AND ON THE LOC WHEN I NOTICED TFC POP UP ON THE TCASII SLIGHTLY L OF CTRLINE BTWN US AND THE RWY. DSNDING BELOW 1000 FT WE GOT A TA. AT AROUND 700 FT THE TFC WAS SHOWING 300 FT BELOW US AND LESS THAN 1 MI. I TOLD THE CAPT THIS DID NOT LOOK GOOD, I WAS GOING AROUND. AFTER STARTING THE GAR WE RECEIVED AN RA AND THE TFC WAS 200 FT BELOW US SHOWING A CLB. WE EXECUTED THE MISSED APCH IN NAV AND FLEW THE WHOLE MISSED APCH AND CLBED TO THE MISSED APCH ALT OF 3000 FT. ON THE MISSED APCH WE ASKED THE CTLR WHAT WE ALMOST HIT. SHE SAID IT WAS A C208 AND HE WAS NOT WHERE HE WAS SUPPOSED TO HAVE BEEN. WE EXECUTED THE WHOLE MISSED APCH AND WAS CLRED FOR THE SAME APCH AGAIN WITH A SUCCESSFUL LNDG. WHEN ON THE GND I CALLED THE DISPATCHER AND CHIEF PLT. AFTER DISCUSSING WITH THEM I CALLED THE TWR. THEY TOLD ME THE TAIL NUMBER OF THE C208. THEY TOLD ME THAT THEY TALKED TO THE PLT OF THE CESSNA AND HE SAID HE HAD A VISUAL ON US. I TOLD THEM HOW COULD HE IF WE WERE IMC WHEN THE NEAR MISS OCCURRED. THEN THEY TOLD ME THAT HE SAID HIS XPONDER WAS MALFUNCTIONING. HE ALSO TOLD THEM HE WAS 1 1/2 MI N OF THE FINAL APCH COURSE. ON THE SECOND APCH WE DID NOT PICK UP THE RWY UNTIL WE WERE AT 600 FT. DURING THE FIRST APCH WE NEVER SAW THE ARPT OR RWY AND WE WERE IN VERY HVY RAIN AND IMC THE WHOLE TIME. 2 PAX IN FIRST CLASS DID SEE THE ACFT OUT OF THEIR WINDOWS ON THE L SIDE OF THE ACFT. THEY WERE SITTING IN THE 2 FIRST ROWS OF FIRST CLASS WINDOW SEATS. SUPPLEMENTAL INFO FROM ACN 609960: FLT ATTENDANT OVERHEARD A PAX IN FIRST CLASS TELLING ANOTHER HE SAW A SMALL ACFT PASSING VERY CLOSE UNDERNEATH US ON THE L SIDE OF THE ACFT. TWR SAID THEY PULLED THE VOICE TAPES. THERE IS NO DOUBT IN MY MIND THAT THIS WOULD HAVE BEEN A MIDAIR, IF IT WAS NOT FOR TCASII AND THE QUICK ACTION OF MY FO.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.