CAPT OF AN MDT FAILED TO STOP A 'HOT ENG START' BEFORE THE FLT ATTENDANT HAD ORDERED ACFT EVAC BASED ON A MECH ASKING HER TO ADVISE THE CAPT THERE WERE FLAMES COMING OUT OF ONE OF THE ENG TAILPIPES.

Narrative

DURING ENG START A MECH OPENED THE CABIN DOOR AND TOLD FLT ATTENDANT THERE WERE FLAMES FROM L ENG TAILPIPE. FLT ATTENDANT THEN RPTS TO COCKPIT 'L HAND ENG ON FIRE' AND IMMEDIATELY ORDERS EVAC WITHOUT WAITING FOR CAPT'S RESPONSE. I (CAPT) SHUT DOWN ENGS BY PLACING CONDITION LEVERS IN FUEL OFF AND PULLING L FIRE 'T' HANDLE. THERE WERE NO COCKPIT INDICATIONS OF A FIRE BUT THE ITT WAS AS HIGH AS 998 DEGS C. I REALIZE THERE IS NO FIRE; ONLY A START THAT GOES BAD. I MUST HAVE GOT DISTRACTED DURING START AND DID NOT LOOK AT NG AND ITT UNTIL IT WAS STABLE. I DID NOT HAVE TIME TO STOP FLT ATTENDANT FROM STARTING EVAC SINCE I WAS BUSY SHUTTING ENGS DOWN. DURING THIS; FO ASKED IF I WANT EQUIP AND I SAY YES SINCE WE HAVE AN UNCTLED EVAC THAT WAS NOT ORDERED AND I DID NOT KNOW IF ANYBODY GOT HURT JUMPING OUT. I DID NOT FOLLOW THROUGH WITH EMER EVAC CHKLIST NOR ENG FIRE CHKLIST SINCE I DID NOT ORDER EVAC AND THERE WAS NO FIRE. EVAC COULD HAVE BEEN PREVENTED IF FLT ATTENDANT HAD ONLY WAITED A FEW SECONDS FOR A RESPONSE FROM ME. IT CREATED A POTENTIAL DISASTER WITH PEOPLE JUMPING OUT NOT KNOWING IF ENGS WERE SHUT DOWN PROPERLY AND PROPS STILL SPINNING. NOBODY GOT HURT; FIRE TRUCKS RESPONDED AND AS I STATED THERE WAS NO FIRE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE WAS GIVEN ADDITIONAL TRAINING IN THE ACFT SIMULATOR COVERING ENG STARTING PROCS SINCE THE ENG IN THIS INCIDENT HAD TO BE INSPECTED DUE TO THE TEMP LIMITS BEING EXCEEDED. HE SAID THAT IF THE FLT ATTENDANT WOULD HAVE DELAYED THE EVAC CALL A MOMENT; HE COULD HAVE CHKED ENG AND DETERMINED THAT THERE WAS NO FIRE. HE WAS CONCERNED FOR THE SAFETY OF THE PAX RUNNING INTO A PROP DURING EVAC. ANOTHER ACFT WAS SUBSTITUTED FOR THIS FLT. THE COMPANY'S REMEDIAL TRAINING HAS TEMPORARILY SATISFIED THE FAA THAT APPROPRIATE ACTION WAS TAKEN FOR THIS MISTAKE.