What was found
DURING REPLACEMENT OF HORIZONTAL STABILIZER REAR ATTACH BRACKET WITH NEW IMPROVED BRACKET PN 1232624-1 IAW SE84-17, DYE PENETRANT INSPECTION REVEALED A .75 INCH CRACK UNDER LEFT REAR ATTACH BRACKET AT OUTBOARD BOLT HOLE, IN RADIUS OF SPAR FLANGE. REPAIRED SPAR WITH DOUBLER. THIS SUBMITTER HAS REPAIRED 8 AIRCRAFT WITH CRACKED BRACKETS. IF THE BRACKETS ARE REPLACED AT THE FIRST SIGN OF CRACKING, THE SPAR WILL PROBABLY BE OK. IF BRACKETS ARE KEPT IN SERVICE UNTIL CRACKING IS SEVERE, THEN SPARS WILL LIKELY BE CRACKED ALSO.