What was found
YYC C4, RIGHT HAND WING PANELS 622AT AND 623AT HAVE FRETTING CORROSION IN COUNTER SINKS. REPAIRED IAW DHC8 RD 8-57-1420, ISS 3 AND RD 8-57-1715, ISSUE 3.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
YYC C4, RIGHT HAND WING PANELS 622AT AND 623AT HAVE FRETTING CORROSION IN COUNTER SINKS. REPAIRED IAW DHC8 RD 8-57-1420, ISS 3 AND RD 8-57-1715, ISSUE 3.