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Date:  6-9-2015
Number of Hours:  4.25
Manual Reference:  
Brief Description:  Preparation for Mounting the Horizontal Stabilizer

After attaching the Horizontal Stabilizer Rear Mounts yesterday, I had a niggling thought in the back of my mind that one of the mounts may have moved slightly during the drilling process. I carefully checked the mount position by clamping a four-foot long straight square tube across the mounts, then measuring to both ends from the fuselage upper firewall mounts. Sure enough, there was a bout a ¼” difference. So, the mounts were removed, rejigged, firmly clamped in the correct position, then redrilled with a 5/32” drill and clecoed in place with black, (5/32”) clecos. A repeat of the same measurement process yielded the same dimensions on both sides.

The modifications to the horizontal stabilizer defined in drawing # P-T-HT, VT, were made. This consists of increasing the center skin openings to provide mounting clearance, and drilling pilot holes in both spars. After a trial mount to the rear of the fuselage, I determined that the opening in the bottom skin will need to be increased a little.
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Front Spar Mounting Pilot Holes

Front Spar Mounting Pilot Holes

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Rear Spar Mounting Pilot Holes

Rear Spar Mounting Pilot Holes

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Horizontal Stabilizer Modified Skin Openings

Horizontal Stabilizer Modified Skin Openings

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