MLG FLC INTERRUPTS CHKLIST TO START SECOND ENG. MAKES TKOF WITHOUT FLAPS.

Narrative

PROBLEM OCCURRED ON A SCHEDULE ACR FLT. ACFT WAS LIGHTLY LOADED SO I DECIDED TO DO A DELAYED ENG START/SINGLE ENG TAXI. THIS IS PERFECTLY ACCEPTABLE PER OUR OPS MANUAL; BUT NOT ACTUALLY DONE MUCH DURING THE SUMMER DUE TO HIGH THRUST LEVELS NEEDED (HIGH TEMPS; AND/OR HIGH GROSS WT). WE ACCOMPLISHED THE DELAYED AFTER START CHKLIST THEN PROCEEDED TO START TAXIING FOR THE DEP RWY. WHEN I SAW THAT THERE WERE NO OTHER ACFT AHEAD AND THAT WE WOULD BE #1 FOR TKOF; I HAD THE FO START THE 2ND ENG. WE HAD ALREADY STARTED THE DELAYED BEFORE TKOF CHKLIST; AND I INTERRUPTED HIM TO HAVE HIM START THE ENG. NORMALLY; HE WOULD HAVE PUT THE FLAPS TO THE TKOF POS DEPARTING THE RAMP. BUT EVIDENTLY HE FORGOT; AND THAT IS THE POINT ON THE CHKLIST THAT I INTERRUPTED HIM. AFTER THE ENG START WE FINISHED THE DELAYED BEFORE TKOF CHKLIST AND WERE CLRED IMMEDIATELY FOR A ROLLING TKOF. TKOF WAS NORMAL; WITH A HIGH RATE OF ACCELERATION. THE ONLY TIME WE NOTICED THE FLAPS WERE NOT DOWN WAS WHEN I CALLED FOR THEM TO BE RETRACTED AFTER TKOF. CONTRIBUTING TO THE LACK OF DETECTION IS THAT THERE IS NO TKOF WARNING SYS ON THIS ACFT (MLG). FORTUNATELY THIS ACFT HAS NO LEADING EDGE DEVICES EITHER; SO TKOF PERFORMANCE WAS NEAR NORMAL. OF COURSE; IF IT DID HAVE LEADING EDGE DEVICES; IT PROBABLY WOULD HAVE A TKOF WARNING SYS. LESSONS LEARNED: 1) DON'T INTERRUPT A CHKLIST ONCE YOU HAVE STARTED IT; 2) IF YOU DO; START IT OVER IN ITS ENTIRETY; 3) DO A QUICK SCAN OF FLAPS; SPD BRAKE; ETC; TAKING THE RWY.