A310 freighter crew has fire warning at FL240 and declares an emergency.

Attributes
ACN	714172
Time
Date	200610
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zzz.artcc
State Reference	US
Altitude	msl single value : 28000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	A310
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : multi engine pilot : atp
Experience	flight time last 90 days : 90 flight time total : 8500 flight time type : 90
ASRS Report	714172
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : landed in emergency condition flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While en route to ZZZ1 at FL280 in cruise for approximately 30 mins; a loop #2 mid illuminated with a single chime. Approximately 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% emergency headset; and declared emergency. Increased speed 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; runway 1R; landed with medium brake. Cleared runway with high speed taxiway; set parking brake; made sure aircraft depressurized. Opened cockpit window; shut off engines and all power except batteries. Talked to fire truck on #1 radio who confirmed there were no hot spots reported on aircraft with thermal imaging. Had firemen check brakes for smoke and possible fire; reported that they were not hot and no fire. Called company and requested tug. Exited with help from maintenance through left door and relinquished control to maintenance. While en route first officer completed red ecams; ran QRH procedure; assisted with checklists. The first officer was superb in helping us achieving an uneventful landing in approximately 13 mins.

Original NASA ASRS Text

Title: 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.

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.