As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR - FLT 4315 - CREW REPORTED APU CAUSED SMOKE ON GROUND WITH PACKS RUNNING, MAINTENANCE FOUND APU INOPERATIVE. PLACED APU ON MEL 49-00-00. AFTER MAINTENANCE TROUBLESHOOTING FOUND APU TO BE CAUSING THE SMOKE PROBLEM. REMOVED AND REPLACED APU WITH SERVICEABLE UNIT. OPS CHECKED APU AND PACKS GOOD. (M)