Narrative:

At FL370 position clxtn #3 fire detection fail alert illuminated, followed shortly thereafter by engine fire #3 alert. Engine fire checklist completed, both fire bottles fired, declared emergency, descended to FL330 with ATC clearance. Direct champ direct jfk, uneventful landing, met by crash fire rescue equipment. All parties very helpful. Aircraft landed under maximum landing weight.

Google
 

Original NASA ASRS Text

Title: AN MD11 IN CRUISE AT FL370 DECLARED AN EMER AND DIVERTED DUE TO A #3 ENG FIRE WARNING.

Narrative: AT FL370 POS CLXTN #3 FIRE DETECTION FAIL ALERT ILLUMINATED, FOLLOWED SHORTLY THEREAFTER BY ENG FIRE #3 ALERT. ENG FIRE CHKLIST COMPLETED, BOTH FIRE BOTTLES FIRED, DECLARED EMER, DSNDED TO FL330 WITH ATC CLRNC. DIRECT CHAMP DIRECT JFK, UNEVENTFUL LNDG, MET BY CFR. ALL PARTIES VERY HELPFUL. ACFT LANDED UNDER MAX LNDG WT.

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.