What was found
WHILE REPLACING PRIMARY CONTROL CABLES PER AD 87-02-2, CORROSION WAS EVIDENT AT ELEVATOR CABLE ATTACH HORN BOLT HOLES. FURTHER INVESTIGATION AFTER QUADRANT REMOVAL FOR CORROSION REPAIR SHOWED FROZEN PIVOT BEARING PRESSED INTO MAGNESIUM CASTING. ATTEMPTS TO REMOVE BEARING FOR REPLACEMENT WERE UNSUCCESSFUL USING HEAT, PENETRANT, AND HYDRAULIC PRESS. CASTING EVENTUALLY FAILED AND BECAME UNSERVICEABLE. BEARING NEVER EVEN BUDGED. SUBSTANTIAL CORROSION BETWEEN STEEL BEARING AND MAGNESIUM CASTING WAS OBVIOUS. BEARING PN KP4.