ACR HAS ENG FIRE WARNING AT V1. ABORTS TKOF.

Narrative

HUB ARPT DEP COMPLEX. CLRED FOR TKOF BEHIND MLG TO 'MAINTAIN VISUAL SEPARATION WITH DEPARTING ACFT.' TKOF CLRNC GIVEN BEFORE OTHER ACFT HAD ROTATED. AT V1 JUST AS NOSE WAS LIFTED OFF RWY #1 FIRE WARNING AND BELL SOUNDED. TKOF ABORTED AS ACFT WT WAS WELL BELOW RWY LIMITED WT. ACFT WAS STOPPED WELL SHORT OF RWY END. PERFORMED ENG FIRE CHKLIST AND AFTER NO FIRE HAD BEEN CONFIRMED WE RETURNED TO THE GATE. MAINT INSPECTION REVEALED THAT FIRE WARNING HAD BEEN CAUSED BY RUPTURE IN 8TH STAGE BLEED AIR DUCT. NO OTHER DAMAGE DONE TO ACFT. NO PERSONAL INJURIES. (SIDE NOTE: THE ACFT BEHIND US HAD BEEN CLRED FOR TKOF BEFORE WE BECAME AIRBORNE AND TWR HAD TO CANCEL ITS TKOF CLRNC WHEN WE ABORTED.) WHEN THE NOSE GEAR LIFTED OFF THE ACARS RPTED THE ACFT 'OFF' AND FLT DEPT SUPVRS SUBSEQUENTLY ACCUSED ME OF TAKING OFF AND THEN ABORTING THE TKOF IN VIOLATION OF COMPANY POLICY. COMPANY TRAINING TREATS V1 AS A 'GO/NO GO' SPD ASSUMING THAT ALL TKOFS ARE EXACT BALANCED FIELD LENGTH. IN REALITY; MOST FLTS MAY BE OPERATED AS DONE ABOVE IN WHICH V1 WAS A DECISION SPD (MIN CRITICAL ENG FAILURE SPD) WHILE A HIGHER REFUSAL SPD (MAX GND SPD IN WHICH THE ACFT CAN STILL BE STOPPED ON THE RWY) WAS APPROPRIATE. SUPPLEMENTAL INFO FROM ACN 201026: CRASH TRUCK SCANNED ENG AND RPTED TO FIRE. MAINT FOUND RUPTURED 8TH STAGE BLEED DUCT.