Narrative:

This report covers 2 takeoffs and lndgs but only 1 problem. We experienced a chiming of the fire bell on climb out. There were no other indications and it quit before we figured out what the cause was. The climb was continued and the problem occurred again at 28000 ft. This time there was also a couple of flashes of the #2 engine fire light. The engine was shut down and we returned to cun. After an extensive check of the aircraft and engine by a local mechanic, we took off again. Everything had checked out fine (with no indication of fire or bleed leak) but I was not sure the mechanic had found the problem. The problem occurred again at 18000 ft on climb. This time it was dark and we could see the ground fault light blink, followed by the bell chime and occasionally a blink of the fire light. Now that we knew the source of our problem, we isolated the bad loop and did not shut the engine down. This indication problem caused an extensive delay that could be prevented in the future if procedures were in place to check the integrity of the individual system that all tie into 1 warning light. Another possibility is that a ground fault light be installed for each fire loop of each engine.

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Original NASA ASRS Text

Title: AN ACR LGT RETURNED AND LANDED WITH AN APPARENT ENG FIRE. THE ACTUAL PROB WAS AN INTERMITTENT GND FAULT.

Narrative: THIS RPT COVERS 2 TKOFS AND LNDGS BUT ONLY 1 PROB. WE EXPERIENCED A CHIMING OF THE FIRE BELL ON CLBOUT. THERE WERE NO OTHER INDICATIONS AND IT QUIT BEFORE WE FIGURED OUT WHAT THE CAUSE WAS. THE CLB WAS CONTINUED AND THE PROB OCCURRED AGAIN AT 28000 FT. THIS TIME THERE WAS ALSO A COUPLE OF FLASHES OF THE #2 ENG FIRE LIGHT. THE ENG WAS SHUT DOWN AND WE RETURNED TO CUN. AFTER AN EXTENSIVE CHK OF THE ACFT AND ENG BY A LCL MECH, WE TOOK OFF AGAIN. EVERYTHING HAD CHKED OUT FINE (WITH NO INDICATION OF FIRE OR BLEED LEAK) BUT I WAS NOT SURE THE MECH HAD FOUND THE PROB. THE PROB OCCURRED AGAIN AT 18000 FT ON CLB. THIS TIME IT WAS DARK AND WE COULD SEE THE GND FAULT LIGHT BLINK, FOLLOWED BY THE BELL CHIME AND OCCASIONALLY A BLINK OF THE FIRE LIGHT. NOW THAT WE KNEW THE SOURCE OF OUR PROB, WE ISOLATED THE BAD LOOP AND DID NOT SHUT THE ENG DOWN. THIS INDICATION PROB CAUSED AN EXTENSIVE DELAY THAT COULD BE PREVENTED IN THE FUTURE IF PROCS WERE IN PLACE TO CHK THE INTEGRITY OF THE INDIVIDUAL SYS THAT ALL TIE INTO 1 WARNING LIGHT. ANOTHER POSSIBILITY IS THAT A GND FAULT LIGHT BE INSTALLED FOR EACH FIRE LOOP OF EACH ENG.

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.