A310 FREIGHTER CREW HAS FIRE WARNING AT FL240 AND DECLARES AN EMER.

Narrative

WHILE ENRTE TO ZZZ1 AT FL280 IN CRUISE FOR APPROX 30 MINS; A LOOP #2 MID ILLUMINATED WITH A SINGLE CHIME. APPROX 5 SECONDS LATER B LOOP #2 MID ILLUMINATED ACCOMPANIED BY RED SMOKE LIGHT AND CRC CONTINUOUS REPETITIVE CHIME. RED MASTER WARNING AND RED ECAMS. PUT ON MASK 100% EMER HEADSET; AND DECLARED EMER. INCREASED SPD TO BOTTOM OF RED ZIPPER. WE WERE ABOUT 70-80 MI FROM ZZZ2. GOT ALTIMETER SETTING AND WX FOR ZZZ2 -- 1800 FT BROKEN 6 MI; SHOT ILS; RWY 1R; LANDED WITH MEDIUM BRAKE. CLRED RWY WITH HIGH SPD TXWY; SET PARKING BRAKE; MADE SURE ACFT DEPRESSURIZED. OPENED COCKPIT WINDOW; SHUT OFF ENGS AND ALL PWR EXCEPT BATTERIES. TALKED TO FIRE TRUCK ON #1 RADIO WHO CONFIRMED THERE WERE NO HOT SPOTS RPTED ON ACFT WITH THERMAL IMAGING. HAD FIREMEN CHK BRAKES FOR SMOKE AND POSSIBLE FIRE; RPTED THAT THEY WERE NOT HOT AND NO FIRE. CALLED COMPANY AND REQUESTED TUG. EXITED WITH HELP FROM MAINT THROUGH L DOOR AND RELINQUISHED CTL TO MAINT. WHILE ENRTE FO COMPLETED RED ECAMS; RAN QRH PROC; ASSISTED WITH CHKLISTS. THE FO WAS SUPERB IN HELPING US ACHIEVING AN UNEVENTFUL LNDG IN APPROX 13 MINS.