As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE WASHING AC, SCRUB BRUSH NOCKED OFF NUT AND ENGAGED PORTION OF ONE OF THE (AN4-11A) BOLTS THAT SECURES THE RT MLG ASSY TO THE RT WING. BOLT WAS CORRODED ALL THE WAY ACROSS ITS CROSS SECTION. SUGGESTIONS: PERIODICALLY CHECK TORQUE ON THESE BOLTS TO ENSURE BOLT NOT CORRODED THROUGH LIKE THIS ONE. REPLACE THES BOLTS PERIODICALLY TO PRECLUDE CORROSION FAILURE. (K)