What was found
MECHANIC HEARD (POPPING) NOISE WHEN FLAPS WERE EXTENDED OR RETRACTED. FOUND THE UPPER FLAP TRACK HARDWARE WAS HITTING THE FLAP WELL CUT OUTS. THE BOLTS WERE INSTALLED FACING OB AT THE FACTORY. REVERSED HARDWARE AND PROBLEM WENT AWAY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
MECHANIC HEARD (POPPING) NOISE WHEN FLAPS WERE EXTENDED OR RETRACTED. FOUND THE UPPER FLAP TRACK HARDWARE WAS HITTING THE FLAP WELL CUT OUTS. THE BOLTS WERE INSTALLED FACING OB AT THE FACTORY. REVERSED HARDWARE AND PROBLEM WENT AWAY.