A G200 PLT FAILS TO DO A WALKAROUND PRIOR TO STARTING THE ENGS RESULTING IN AN ENG COVER BEING INGESTED INTO THE #2 ENG.

Narrative

I WAS BRIEFED TO GO TO THE ARPT AND ASSIST MAINT WITH TAXIING AN ACFT FOR AN ENG RUN AFTER A NEW ENG HAD BEEN INSTALLED ON THE #1 SIDE. UPON ARR; THE LEAD MECH SAID HE HAD PUT ON 8000 LBS OF FUEL AND ONLY NEEDED HELP WITH LOADING THE NEW SERIAL NUMBERS IN THE MFD AND TAXIING TO THE RUN-UP AREA. AFTER A 2 HR DELAY; MY FO AND I RETURNED TO THE ACFT WHICH WAS NOW OUT OF THE HANGAR; PARKED AND CHOCKED. IT APPEARED READY FOR START AND TAXI. 1 MECH STOOD IN FRONT OF THE ACFT AND CLRED ME TO START. AFTER 1 ABORTED START; #1 STARTED SUCCESSFULLY AND APPEARED NORMAL. AT THIS TIME THE MECH GOT IN THE ACFT AND CLOSED THE DOOR. WE THEN STARTED #2 ENG. NO ONE WAS OUTSIDE THE ACFT. WHEN #2 REACHED 30% N2; 2 LOUD BANGS WERE HEARD. I IMMEDIATELY SHUT DOWN BOTH ENGS. I ASKED THE MECH IF HE HAD HEARD THE NOISE. HIS REPLY WAS; 'YES; SOUNDS LIKE A BLEED VALVE; START IT AGAIN.' HOWEVER; SOMETHING SAID 'STOP AND INVESTIGATE.' WE HAD INGESTED AN ENG INLET COVER IN #2 ENG. THE ENG WAS HEAVILY DAMAGED. IT WAS MY RESPONSIBILITY AS CAPT TO ENSURE A PREFLT INSPECTION AND WALKAROUND WAS COMPLETED. I HAD NOT. I HAD ASSUMED MAINT HAD COMPLETED THESE FUNCTIONS. EVEN THOUGH A CAPT MAY DELEGATE AUTH; HE SHOULD NEVER SIMPLY ASSUME OTHERS HAVE ACCOMPLISHED HIS DELEGATED RESPONSIBILITIES.