Narrative:

Aircraft on departure roll on runway 31L. Amass alert announced that runway 13R was occupied.

Google
 

Original NASA ASRS Text

Title: A LCL CTLR RPT REGARDING A POTENTIAL GND CONFLICT DURING AN APCH TO AN OCCUPIED RWY WITH A WRONG RWY INDICATION FROM THE AMASS WARNING SYS LOCATED AT JFK, NY.

Narrative: ACFT ON DEP ROLL ON RWY 31L. AMASS ALERT ANNOUNCED THAT RWY 13R WAS OCCUPIED.

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.