What was found
UPON REMOVAL OF LT MLG HYD EXTEND & RETRACT ACTUATOR TO FACILITATE OTHER MAINTENANCE, A HOLE WAS DISCOVERED IN THE LT WING FWD SPAR WEB. THE HOLE IS LOCATED AT APPROX LT WS 91.62 & WAS CREATED WHEN COTTER PIN USED TO SAFETY HARDWARE STACK UP AT UPPER MLG ACTUATOR ATTACH POINT CHAFED THROUGH WEB. THE HOLE MEASURES .13 HIGH BY .253 ACROSS & IS LOCATED JUST BELOW VERTICAL LEG OF UPPER FWD WING SPAR CAP. REPAIR AREA IAW EITHER OEM OR DER SUPPORTED REPAIR DEFINITION. A SUPPLEMENT WILL BE SUBMITTED WITH THIS SDR TO FURTHER ILLUSTRATE DAMAGE POINT.