What was found
'NO FLIGHT' - FOUND DURING 'HEAVY C-MAINTENANCE CHECK' AT TIMCO HEAVY MAINTENANCE FACILITY (WINSTON/SALEM, NC). FOUND 20 DRILL MARKS ON MCD CUT OUT FORWARD END OF INTERNAL DOUBLER PROTRUDING THROUGH GILLINER STRAP BS 470 TO BS 500, STR S4L TO STR S12L. REPAIRED DRILL START MARKS ON MCD INTERNAL DOUBLER STRAP IAW RFTS N180AX-10-20569 AND 8110 3, DATED 11-1-99. AIRCRAFT WAS RETURNED TO SERVICE. (X)