Match drilled #30 the horizontal stabilizer rear spar using the two holes in each F-811B-1 stabilizer attach bar as a guide Drilled #30 the four (4) HS-814-1 splice angle bolt holes through the splice angle, the F-819-1 aft deck , F-887-1 upper longeron, F-810D-1 spacer and F-810C angle. Final drilled #12 all of the holes for AN3 bolts
