What was found
A CRACK WAS FOUND ON THE FUSELAGE SKIN AT BS 1640, AT THE UPPER FWD CORNER OF THE OUTFLOW VALVE CUT OUT. ER/A 471888-14 AUTHORIZED REPAIR. COMPLIED WITH SECTION II OF ERA 471888C-14, REV C IAW NDTM PT 6, 53-00-06 AT BS 1640, STR 22-24L WITH NO DEFECTS NOTED.