As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH COMMS AND NAVS WOULD HAVE EXCESSIVE STATIC IN LIGHT PRECIPITATION. THE COMMS WOULD BECOME UNREADABLE AND BOTH NAVS WOULD FLAG WITH LOSS OF L/R DEVIATION VOR OR LOC. TEST AIRCRAFT WITH DAYTON GRANGIER HIGH VOLTAGE STATIC TESTER AND FOUND LORAN ANTENNA SOURCE OF NOISE. REPLACE WITH HIGH-SPEED BLADE STYLE ANTENNA, PN 14663-03. FLIGHT TESTED AND PROBLEM CORRECTED.