THE ENG OF A BA31 WAS SHUT DOWN DURING TKOF AND TKOF WAS ABORTED. ONE OF THE PAX TOLD THE FLC THAT SMOKE WAS COMING FROM THE L ENG AND SHORTLY AFTER; AN UNCOMMANDED EVAC ENSUED. WHILE STILL ON THE RWY; THE FLC SHUT DOWN THE REMAINING ENG OUT OF FEAR THAT PAX WOULD EVAC INTO A MOVING PROP.

Narrative

AS THE CAPT STARTED TO ADVANCE PWR; A LOUD BANG WAS HEARD FROM THE L ENG. THE CAPT PROCEEDED TO SHUT DOWN THE L ENG. AT THE SAME TIME A PAX NOTIFIED US THAT HE HAD SEEN SOME SMOKE COMING FROM THE L ENG. AS I WAS TRYING TO CONFIRM THE RPT OF SMOKE; WE NOTICED THAT THE LADY SITTING IN THE EMER EXIT ROW HAD STARTED TO OPEN THE EMER EXIT. OUT OF FEAR THAT PEOPLE; WHO WERE NOW GETTING UP; WOULD ATTEMPT TO EXIT; THE CAPT STARTED SHUTTING DOWN THE R ENG AND TOLD ME TO EVAC. I NOTIFIED THE TWR AND STARTED TO PROCEED TOWARDS THE BACK. I TOLD THE PAX TO CALM DOWN AND TO SIT DOWN. MOST PAX; HOWEVER; WERE DETERMINED TO GET OUT. SINCE I HAD NOT ASSESSED THE CONDITION OF THE L ENG (FIRE; SMOKE) I ADVISED THEM TO PROCEED CAREFULLY OUT THROUGH THE EMER EXIT OVER THE WING. IN THE MEANTIME I COULD NOT SEE ANY FIRE OR SMOKE COMING FROM THE L ENG. I OPENED THE MAIN DOOR AND AFTER CONFIRMING NO FIRE OR SMOKE I ASSISTED THE REMAINING PAX OFF THE ACFT THROUGH THE MAIN CABIN DOOR. WE LED THE PAX AWAY FROM THE ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR WAS TOLD BY THE MECHS THAT THE BA31'S L ENG FAILED AS A RESULT OF THE FAILURE OF THE REAR TURBINE SEAL. THE EVAC TOOK PLACE WHILE THE ACFT WAS STILL ON THE RWY; AND THE FLC NOTIFIED ATC. SUPPLEMENTAL INFO FROM ACN 334148: L ENG FAILED ON TKOF AND ENG WAS SECURED. TKOF WAS ABORTED. PAX ATTEMPTED TO EXIT ACFT THROUGH OVERWING EMER EXIT WITH R ENG STILL RUNNING.