Aileron Balance - Piper Cherokee Six Service Manual

PIPER CHEROKEE SIX SERVICE MANUAL
Figure 4-17. Aileron Balance
4-35. BALANCING AILERONS. (Refer to Figure 4-17.)
With the hinge pins in place, position the aileron on the knife edge supports in a draft free
area and in a manner to allow unrestricted movement on the hinge pins. Position the scale and
screw jack approximately midway between the hinge points and as near the trailing edge as
practical. Place the protractor on the upper surface of the control and adjust the height of the
screw jack as required to obtain an angle of 12.10
°
+ .5
°
between the upper surface of the
aileron and the horizontal. Remove the protractor and record the scale reading. Measure the
horizontal distance between the centerline of hinge and point of contact of the screwjack, "D"
inches. Determine the weight of the screw jack and subtract this weight from the above scale
reading to obtain the weight, "W" of the aileron. Multiply the weight "W" times distance "D"
to obtain the static balance in inch-pounds. If the static balance of the ailerons is not within the
limits shown in Table IV-II, proceed as follows:
a. Nose Heavy: This condition is highly improbable - recheck measurements and
calculations.
b. Nose Light: In this case the mass balance weight is too light, or the aileron is too
heavy. If the aileron is too heavy because of painting over old paint, it will be necessary to
strip all paint from the aileron and, start over. If the aileron is too heavy resulting from
repair to the skin or ribs, it then becomes necessary to remove the repair and replace all
damaged parts. Normally, on the ailerons, 2 to 3 inch-pounds will be available to permit
repainting (1.00 inch-pound average) repairs, addition of static wicks, etc., however to be
certain, check the balance.
Revised: 12/4/79
STRUCTURE
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