What was found
(CAN) AN INSP WAS CARRIED OUT ON THE STABILATOR HORN DUE TO REPORTS OF CRACKING ON OTHER ACFT. NO CRACKS WERE VISIBLE FROM THE OUTSIDE, AND IT WAS NECESSARY TO REMOVE STABILATOR TORQUE TUBE PN20203-02 FROM HORN IN ORDER TO CHECK FOR CRACKS INSIDE HORN. THIS REQUIRES REMOVAL OF 2 STABILATOR HALVES, AND REMOVAL OF TORQUE TUBE AND HORN ASSY FROM ACFT. CRACKS WERE NOT EASILY VISIBLE, BUT UPON CLOSE EXAMINATION WITH MAGNIFYING GLASS, AND LATER, WITH DYE PENETRANT, A CRACK WAS FOUND RUNNING FROM EACH ATTACH THRU BOLT HOLE TO THE BALANCE TUBE HOLE ON THE FWD SIDE OF THE HORN. IT IS A CAST ALUMINUM PART. OTHER SIMILAR CRACKS HAVE BEEN FOUND ON OTHER ACFT AND HAVE BEEN ATTRIBUTED TO STRESS CORROSION CRACKING.