Hangar 9 Piper Cherokee Instruction Manual page 24

Section 6: Installing the Tail
Step 4. Locate the horizontal stabilizer. Using a ruler and a felt
tipped pen, mark the exact center on the top of the stabilizer.
Step 5. Insert the horizontal stabilizer into the fuselage until the
center line drawn in the previous step can be seen through the
center of the slot for the vertical stabilizer.
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Step 6. Check the alignment of the horizontal stabilizer by
measuring from a fixed point along the center line of the
fuselage to the leading edge on each side of the horizontal
stabilizer. A piece of masking tape positioned at the centerline of
the fuselage top can be used as the reference point. The distance
must be equal on both sides. If not, adjust the stabilizer
accordingly until the measurements are the same.
Note: It is important to be sure the horizontal stabilizer is
correctly aligned.
Step 7. When you are satisfied with the alignment, use a pencil
to trace around the top and bottom of the stabilizer where it
meets the fuselage. The pencil should leave a light indentation in
the covering.
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