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Zenith CruZer & Sonex Logs
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Date:  2-22-2019
Number of Hours:  0.00
Manual Reference:  C75-FA-5-6-4
Brief Description:  Install motor mounts

After wrapping up the gussets and side skin-to-firewall drilling, I tackled the motor mounts.

Positioned the upper mounts on the longeron, clamped, and drew a line on the bottom of the mount reflecting the edge of the longeron. Removed the mounts, measured 10mm from each end, and a spot corresponding to the centerline of the longeron, and pilot-drilled the mount. Clamped mounts in place and drilled -thru the mounts into the longerons. Up-drilled to #12 to accomodate an AN3 bolt.

Moving on to the lower mounts, I deteremined the centerline of the mount and drilled the front of the mount (facing the firewall) just enough to make a mark. Removed the mount and drilled the hole in steps up to #20. Cleco'ing the mount in place, I then ensured the centerline of the mount lined up with the centerline of the existing lower longeron holes, and drilled from the bottom of the fuselage with a #40 bit just to mark the spot for the holes. Removed mounts and pilot-drilled the mounts. Re-cleco'd, the up-drilled the holes to #12 in steps to accomodate AN3 hardware.
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Right upper mount pilot drilled

Right upper mount pilot drilled

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lower right mount final-size drilled

lower right mount final-size drilled

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