Stabilator Balance - Piper Cherokee Six Service Manual

Mass Balance
Weight
Non-Adjustable
Balance Weight
PA-32R-300 Only
Figure4-16 Stabilator Balance
4-34. BALANCING STABILATOR. (Refer to Figure4-16)
Prior to balancing the stabilator, tape the trim tab in the neutral position with a small
piece of tape. For balancing, the stabilator assembly must be complete, including the trim tabs,
the tab push rod and end bearing, stabilator tips and all attaching screws. Place the complete
assembly on the knife edge supports in a draft free area and insure unrestricted movement.
Position the platform scale and spindle approximately midway between the hinge points and
on the stabilator rear spar. The spindle should not be in contact with any part of the trim tab.
Place the protractor on the balance weight arm and adjust the height of the screw jack as
required to position the arm in the level position or 0.0
°
+ .5
°
with the horizontal. Remove the
protractor and record the scale reading. Measure the horizontal distance between the hinge
line and the screwjack point of contact, "D"inches. Determine the weight of the screwjack and
subtract this weight from the above scale reading to obtain the weight "W" of the stabilator.
Multiply the weight "W" times the distance "D" to obtain the static balance in inch-pounds.
This value shall be within the limits given in Table IV-II. If the static balance of the stabilator is
not within the limits shown, proceed as follows:
a. Heavy: Remove weight from the mass balance weight until the static balance is
within limits.
b. Light: Add weights to the mass balance weight until the static balance is within
limits. (Refer to Parts Catalog for balance weight part number.)
If the stabilator is overbalanced (nose heavy) as may be possible on an unpainted
stabilator, place the scale and screw jack under the balance weight and proceed as above.
NOTE
On PA-32R-300 do not attempt to adjust the stabilator tip balance weight.
Revised: 12/4/79
STRUCTURE
PIPER CHEROKEE SIX SERVICE MANUAL
1G2