Narrative:

We were on taxiway C to runway 36R at clt. Before takeoff checks were done, the smoke aft light came on. The copilot told ground that we had an aircraft problem. I told the F/a we had a smoke aft light on and to evacuate/evacuation the airplane. I called ground after we checked for fire, smoke. There was none. Did not get a reply on #2 radio. Also called maintenance and charlotte station on #1 radio for a van--did not show. After maintenance cleared the airplane, I boarded the passenger and returned to the gate. Later we found that the copilot microphone stuck open. Callback conversation with reporter revealed the following: reporter thought it was a false warning, but could not be sure. The smoke detector was changed before the aircraft departed again. Reporter does not know if moisture was the problem or a bad detector.

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Original NASA ASRS Text

Title: ACR LTT AFT CARGO LIGHT CAME ON WHILE TAXIING OUT FOR TKOF. FLT CREW NOTIFIED CABIN ATTENDANT AND ACFT WAS EVACUATED.

Narrative: WE WERE ON TXWY C TO RWY 36R AT CLT. BEFORE TKOF CHKS WERE DONE, THE SMOKE AFT LIGHT CAME ON. THE COPLT TOLD GND THAT WE HAD AN ACFT PROB. I TOLD THE F/A WE HAD A SMOKE AFT LIGHT ON AND TO EVAC THE AIRPLANE. I CALLED GND AFTER WE CHKED FOR FIRE, SMOKE. THERE WAS NONE. DID NOT GET A REPLY ON #2 RADIO. ALSO CALLED MAINT AND CHARLOTTE STATION ON #1 RADIO FOR A VAN--DID NOT SHOW. AFTER MAINT CLRED THE AIRPLANE, I BOARDED THE PAX AND RETURNED TO THE GATE. LATER WE FOUND THAT THE COPLT MIC STUCK OPEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR THOUGHT IT WAS A FALSE WARNING, BUT COULD NOT BE SURE. THE SMOKE DETECTOR WAS CHANGED BEFORE THE ACFT DEPARTED AGAIN. RPTR DOES NOT KNOW IF MOISTURE WAS THE PROB OR A BAD DETECTOR.

Data retrieved from NASA's ASRS site as of August 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.