BALANCING
BALANCING EQUIPMENT (chapter 95)
Balancing must be done with tool capable of measuring unbalance in inch-pounds from centerline of
control surface hinge pin. A suggested tool configuration is shown in chapter 95. Other tool configurations
may be used, provided accuracy is maintained and recalibration capability is provided.
Calibrate balancing tool as follows:
1. Place balancing tool on control surface with balance points over control surface hinge centerline and
balance bar parallel to chord line.
2. Position trailing edge support to align tool with control surface chord line and secure in this position.
3. Remove tool without moving trailing edge support.
4. Balance tool by adding weight to light end as required (the movable weight must be at centerline).
5. Place tool on control surface perpendicular to hinge centerline (refer to figures 55-3 and 55-4).
6. Center bubble level by adjusting movable weight and read scale.
BALANCING STABILATOR (figure 55-3)
To balance the stabilator, the assembly must be complete including trim tab, tab push rod, end bearing,
stabilator tips, and all attaching screws. Before balancing, tape trim tab in neutral position with a small piece of
tape. Place complete assembly on knife edge supports in a draft free area in a manner that allows unrestricted
movement. Place tool on stabilator with beam perpendicular to hinge centerline. Do not place tool on trim tab.
Calibrate tool as described in Balancing Equipment. Read scale when bubble level has been centered by
adjustment of movable weight and determine static balance limit. If static balance is not within limits given in
figure 55-3, proceed as follows:
—CAUTION—
Do not attempt to adjust stabilator tip balance weight.
1. If stabilator is out of limits on leading edge heavy side, remove balance plates from mass balance
weight until static balance is within limits.
2. If stabilator is out of limits on trailing edge heavy side, add balance plates to mass balance weight until
static balance is within limits.
VERTICAL STABILIZER
VERTICAL FIN
REMOVAL OF VERTICAL FIN
1. Remove screws from upper and lower tail cone fairing, fin tip cover, and fairing at forward base of fin.
2. Remove rudder per instructions in Removal of Rudder.
3. Disconnect leads from antenna terminals (optional) and attach a line to leads to assist in reinstallation.
4. Disconnect wire antenna (optional) attached to leading edge of fin.
5. Disconnect positive lead to rotating beacon (optional) and attach a line prior to removal. Disconnect
ground lead by removing attachment screw.
55 - 31 - 00
Page - 55-05
Reissued: August 1, 1986
2G3
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
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