The flap drive assembly requires the left drive angle be installed on a right flap rib. And the right drive angle on a left flap rib. See instructions and photos below for more detail.
1. Align and drill 2 flap drive angles on 1 each of left and right flap ribs.
2. Mark rib 5 1/32” from end of rib.
3. Position a Left drive angle on a right flap rib at mark made previously.
4. Transfer drill #40 holes from flap drive angle into rib. Up-drill to #30, but do not rivet drive angles to ribs until flaps have been fitted to the wing and fuselage.
