What was found
CREW REPORTS ON CLIMBOUT HEARD BANG FROM NR 2 ENGINE. ALL ENGINE PARAMETERS FLUCTUATED, FLT ATTENDANTS REPORTED BANG, CREW REPORTED ENG2 VIB INDICATION AT 5.0 BUT NOT FELT. THE FAN SPINNER CONE HAD DELAMINATION AT THE TRAILING EDGE (T/E) SKIRT, WITH MULTIPLE KEVLAR AREAS UNRAVELED. AREAS AT THE T/E SHOWED BOTH SIGNS OF DISBONDING, AS WELL AS AREAS WHERE RESIN WAS EITHER ABSENT OR COMPROMISED. SEVERAL INTACT AREAS FAILED THE "TAP" TEST. BLACKLIGHT INSPECTION SHOWED NO SIGN OF BIRD REMAINS. THIS SPINNER CONE HAD BEEN MODIFIED PER SB PW4ENG 72-629. THIS SB ADDS ADDITIONAL PLIES AT THE REARMOST PORTION OF THE INLET CONE TO PRECLUDE T/E DELAMINATION. IT APPEARS THAT THIS MODIFICATION WAS NOT ACCOMPLISHED PROPER