Laid out flap rib holes on RH flap skin, center punched, and drilled. Bottom side skin cutout for flap pushrod marked. Lined up ribs under flap skin and began pilot drilling ribs starting with top side, upper hole on forward side, then hinge-half strip, and finally lower side. Set 1/16″ hinge half offset by using skinny ruler. Pilot drilled lower side of flap then finished drilling forward edge. After pilot drilling all holes on RH flap assembly, up-drilled all holes to #30. Then repeated process for LH flap assembly. Both flaps need deburring before final assembly
Hours Worked: 5.35
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