Narrative:

Climbing out of jfk to FL280 and direct to rbv. TCAS display went blank and then displayed a fault. I was PNF and began troubleshooting TCAS. Climbing through about 16800-17000 ft; ZNY called out traffic. I looked up and saw what I believe was a beech king air for just a brief second. He looked to me to be about 500 ft above and maybe 500-1000 ft laterally from us. There was absolutely no time to react. I told ZNY that I would probably file a report because that aircraft seemed pretty close. ZNY came back and said it was a VFR aircraft and they were not working it. I'm still not sure if there is a set criteria for reporting a near miss; but that's the closest I've come to another airplane at that altitude. The king air appeared level at 17500 ft cruising east. About 10-15 mins after this incident the TCAS display came back and operated normally for remainder of flight. If TCAS was operational at time of incident; there is no doubt we would have received an RA. I still made an entry in logbook. Again; I don't know if there is certain criteria for reporting a near miss; but I never want to get that close again!

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Original NASA ASRS Text

Title: A B767-200 CLBING WBOUND OUT OF JFK CAME WITHIN ABOUT 500 FT OF A VFR KING AIR. THE B767-200 TCAS HAD JUST FAILED A FEW MINS BEFORE.

Narrative: CLBING OUT OF JFK TO FL280 AND DIRECT TO RBV. TCAS DISPLAY WENT BLANK AND THEN DISPLAYED A FAULT. I WAS PNF AND BEGAN TROUBLESHOOTING TCAS. CLBING THROUGH ABOUT 16800-17000 FT; ZNY CALLED OUT TFC. I LOOKED UP AND SAW WHAT I BELIEVE WAS A BEECH KING AIR FOR JUST A BRIEF SECOND. HE LOOKED TO ME TO BE ABOUT 500 FT ABOVE AND MAYBE 500-1000 FT LATERALLY FROM US. THERE WAS ABSOLUTELY NO TIME TO REACT. I TOLD ZNY THAT I WOULD PROBABLY FILE A RPT BECAUSE THAT ACFT SEEMED PRETTY CLOSE. ZNY CAME BACK AND SAID IT WAS A VFR ACFT AND THEY WERE NOT WORKING IT. I'M STILL NOT SURE IF THERE IS A SET CRITERIA FOR RPTING A NEAR MISS; BUT THAT'S THE CLOSEST I'VE COME TO ANOTHER AIRPLANE AT THAT ALT. THE KING AIR APPEARED LEVEL AT 17500 FT CRUISING E. ABOUT 10-15 MINS AFTER THIS INCIDENT THE TCAS DISPLAY CAME BACK AND OPERATED NORMALLY FOR REMAINDER OF FLT. IF TCAS WAS OPERATIONAL AT TIME OF INCIDENT; THERE IS NO DOUBT WE WOULD HAVE RECEIVED AN RA. I STILL MADE AN ENTRY IN LOGBOOK. AGAIN; I DON'T KNOW IF THERE IS CERTAIN CRITERIA FOR RPTING A NEAR MISS; BUT I NEVER WANT TO GET THAT CLOSE AGAIN!

Data retrieved from NASA's ASRS site as of January 2009 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.