Drilled and riveted the 1/4-28 nutplates to the inboard flap ribs. Riveted the actuator doublers to the inboard ribs. Riveted the flap actuator stiffeners to the flap spars. Riveted the flap spars to the flap ribs with LP4-3 pop rivets. Riveted the flap actuator doublers to the stiffeners.
