What was found
ENGINE COWLING - NR 4 RT ENGINE CORE COWL OUTER SKIN - CRACK - REPAIR - DURING MX WALKAROUND, MX FOUND A CRACK ON THE NR 4 RT CORE COWL OUTER SKIN. THE CIRCUMFERENTIAL CRACK IS APPROX 1 IN LONG. THE LENGTH OF THE CRACK EXCEEDS THE SRM LIMITS. (DISPOSITION IS TO STOP DRILL THE LOWER ENDS OF THE CRACK WITH A 0.250 IN. DIAMETER HOLE; DVI EVERY 3 FLIGHT CYCLES; AND A PERMANENT REPAIR AT THE NEXT A-CHECK AFTER PART 1; EO 4471A070, SRM 51-10-02, SRM 54-41-01 FIG 101, SRM 54-41-01 FIG 201, RPR 3, DER 8110-3 FORM DTD 10APR11.)