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Date:  1-14-2011
Number of Hours:  6.00
Manual Reference:  6ZU4-6+
Brief Description:  Drill inboard rib for left aileron counterbalance

4. (cont.) Accordingly, after making sure sure that the bend angle on the front flange of the ribs were adjusted to match the rib angle with the front of the aileron, I used an adjustable square to align the rib front angles to the same angle, as shown in Fig. 1. Then I clamped the ribs in place, being careful to keep the ribs perpendicular to the table top. Finally I drilled the holes through both sides of the arm and the outboard rib on the drill press, clecoing as I went along, as shown in Fig. 2. Then I enlarged the holes to 1/8" clecoing both ribs as I went along. Finally, I enlarged the holes to 3/16" inserting AN3 bolts as I went along.

5. After checking angle, alignment, etc., I unbolted the ribs from the arm, inserted the inboard rib into the aileron, then inserted the AN3 bolts through holes. Next, using one of the steel weights as a pattern, I drilled the other end of the arm for weight attach bolts. I inserted the arm through the hole in the front of the aileron, and passed the bolts through the arm. Then I inserted the outboard rib into the aileron onto the bolts, and tightened the nuts.

6. Finally, I clecoed the aileron back together, including the inboard balance arm aileron maintaining the wash out angle with a 13-mm block. Then I drilled the outboard aileron, top, front, and bottom, 3/32, 1/8, and #30, clecoing as I went along. It all looks nice and tight, as shown in Fig. 3.
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Rib alignment as done

Rib alignment as done

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Drilling holes through balance arm

Drilling holes through balance arm

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Balance arm bolted & clecoed in place

Balance arm bolted & clecoed in place

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