AN ACR LTT HAD A FIRE WARNING AFTER TKOF.

Narrative

THE CLB WAS NORMAL UP TO ABOUT 400 FT AGL. AT THIS TIME THE L ENG FIRE LIGHT AND MASTER WARNING LIGHTS ILLUMINATED. THE CAPT STATED THAT WE HAD A 'L ENG FIRE WARNING.' AIRSPD WAS VERIFIED ABOVE V2; 114 KTS. ON THE L PROP LEVER AND ASKED FOR VERIFICATION. AT THAT TIME THE FIRE LIGHTS EXTINGUISHED. I ASKED IF THE L PROP HAD INDEED FEATHERED AND HE SAID IT HAD. HE ALSO HAD LOOKED OUT FOR FIRE EMANATING FROM THE ENG NACELLE. THERE WAS NO EVIDENCE OF AN ACTUAL FIRE. AT THIS TIME; HE INSTRUCTED ME TO INFORM TWR CTL THAT WE NEEDED TO RETURN FOR AN EMER LNDG. TWR IMMEDIATELY CLRED US TO LAND ON 22R. AFTER THE 'T' HANDLE HAD BEEN PULLED AND THE FIRE LIGHT EXTINGUISHED; THE CAPT ACTUATED THE FIRE EXTINGUISHER BOTTLE. THE EMER CHKLIST WAS COMPLETE. WE WERE ABEAM THE APCH END ON THE DOWNWIND. HE CALLED FOR GEAR DOWN AND THE BEFORE LNDG CHKLIST. ON SHORT FINAL THE CAPT OPTED FOR A SLIGHTLY HIGHER AIRSPD THAN A NORMAL 2 ENG APCH. WE TOUCHED DOWN AND HE APPLIED REVERSE ON THE OPERATING ENG AS NEEDED. THERE WAS SUBSEQUENT NOSE R MOVEMENT OF THE ACFT. THIS APPARENTLY WAS FORCEFUL ENOUGH TO DISLODGE THE L MAIN OUTBOARD TIRE FROM ITS' RIM. WE ROLLED TO THE FIRST APPROPRIATE TURN OFF AND CLRED THE ACTIVE RWY. THERE THE FIRE TRUCKS WERE WAITING FOR US AND VERIFIED THAT THERE WAS NO FIRE. WE THEN TAXIED BACK TO THE GATE. THE CAUSE OF THE FIRE LIGHT WAS LATER FOUND. A PAIR OF CLAMPS THAT HOLD A BLEED AIR HOSE SECURELY TO THE WALL OF THE ENG NACELLE HAD BROKEN AWAY. THE HOSE SHIFTED POS AND CAME TO REST ON OR IN NEAR PROX TO THE FIRE LOOP.