What was found
INCORRECT REFERENCE WAS USED TO DETERMINE IF HORZ STAB REPAIR WAS ACCOMPLISHED USING FAA APPROVED DATA - PREVIOUS REPAIR ON LEFT HORIZONTAL STABILIZER AT STAB STA 115, 3" WIDE X 3" LONG, 15" AFT OF STAB REAR SPAR. ** SD ** COMING REPLACED PREVIOUS REPAIR ON LEFT HORIZONTAL STABILIZER AT STAB STA 115, IAW EA#7- 5510-91418. THIS REPAIR IS DEEMED MAJOR.