What was found
DURING CHECK-C MAINT ON LT WING THE O/B FLAP I/B MOUNT CASTING ON SPAR TOP I/B STUD WAS EMITTING RUST. REPLACED 2 UPPER STUDS AND INSTALLED NEW HINGE CASTING PER MM 57-40-01.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING CHECK-C MAINT ON LT WING THE O/B FLAP I/B MOUNT CASTING ON SPAR TOP I/B STUD WAS EMITTING RUST. REPLACED 2 UPPER STUDS AND INSTALLED NEW HINGE CASTING PER MM 57-40-01.