Completed step 6 page 21-10. Machine countersunk all of the #40 nutplate attach rivet holes and 6 - #30 holes in the areas indicated in Figure 4. Machine countersunk #30 holes 120 degrees. Completed step 9 – fitted the curved recess of both F-1203C stub spar receptacles per Figure 5 to closely fit the rounded mating ends of the stub spar assemblies on both wings – marked parts for right and left wings. Primed F-1203A bulkhead and the F-1203C stub spar receptacles.
