What was found
FOUND DURING F-1 LETTER CHECK - L/E WING SPAR STIFFENER CRACKED AT NR 3 SLAT O/B TRACK O/B LEG. REPLACED WING SPAR STIFFENER PER M/M 57-20-21.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FOUND DURING F-1 LETTER CHECK - L/E WING SPAR STIFFENER CRACKED AT NR 3 SLAT O/B TRACK O/B LEG. REPLACED WING SPAR STIFFENER PER M/M 57-20-21.