Narrative:

Tower cleared us to land on runway 4L at jfk. At approximately 3 mi, tower cleared an aircraft to cross runway 4L. This was no factor. Inside 2 mi, tower cleared another aircraft, B767, to cross runway 4L at taxiway F. It was clear that the crossing aircraft would not clear the runway prior to us landing. We initiated a go around at approximately 150-100 ft AGL, most likely prior runway threshold, and retuned to land on runway 4R. Was too busy to notice actual separation, but it was a routine go around, not an evasive or emergency type maneuver. Upon calling tower to advise we were going around, they apologized. The probable cause of this event was the tower controller forgetting he cleared us to land on runway 4L, most likely due to being overloaded controling airborne traffic and traffic on the ground. Perhaps using a separate ground frequency controller for aircraft which have landed and taxied clear of their runway, and need to cross another active runway, or a separate frequency (controller) for landing and departure runways when jfk is using the runway 4's. The controllers at jfk are excellent. I believe there was just too much traffic at the time and the workload should have been split.

Google
 

Original NASA ASRS Text

Title: ATCT LCL CTLR, ALSO WORKING GND CTL, CLRS ACFT TO CROSS RWY WITH A SF340 ON SHORT FINAL.

Narrative: TWR CLRED US TO LAND ON RWY 4L AT JFK. AT APPROX 3 MI, TWR CLRED AN ACFT TO CROSS RWY 4L. THIS WAS NO FACTOR. INSIDE 2 MI, TWR CLRED ANOTHER ACFT, B767, TO CROSS RWY 4L AT TXWY F. IT WAS CLR THAT THE CROSSING ACFT WOULD NOT CLR THE RWY PRIOR TO US LNDG. WE INITIATED A GAR AT APPROX 150-100 FT AGL, MOST LIKELY PRIOR RWY THRESHOLD, AND RETUNED TO LAND ON RWY 4R. WAS TOO BUSY TO NOTICE ACTUAL SEPARATION, BUT IT WAS A ROUTINE GAR, NOT AN EVASIVE OR EMER TYPE MANEUVER. UPON CALLING TWR TO ADVISE WE WERE GOING AROUND, THEY APOLOGIZED. THE PROBABLE CAUSE OF THIS EVENT WAS THE TWR CTLR FORGETTING HE CLRED US TO LAND ON RWY 4L, MOST LIKELY DUE TO BEING OVERLOADED CTLING AIRBORNE TFC AND TFC ON THE GND. PERHAPS USING A SEPARATE GND FREQ CTLR FOR ACFT WHICH HAVE LANDED AND TAXIED CLR OF THEIR RWY, AND NEED TO CROSS ANOTHER ACTIVE RWY, OR A SEPARATE FREQ (CTLR) FOR LANDING AND DEP RWYS WHEN JFK IS USING THE RWY 4'S. THE CTLRS AT JFK ARE EXCELLENT. I BELIEVE THERE WAS JUST TOO MUCH TFC AT THE TIME AND THE WORKLOAD SHOULD HAVE BEEN SPLIT.

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.