What was found
HIGH PITCHED SQUEAL FROM F/O SIDE. QUIETER AT LOW ALTITUDES. REMOVED WINDSHIELD. CLEANED MATING SURFACES. RE-INSTALLED WINDSHIELD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
HIGH PITCHED SQUEAL FROM F/O SIDE. QUIETER AT LOW ALTITUDES. REMOVED WINDSHIELD. CLEANED MATING SURFACES. RE-INSTALLED WINDSHIELD.