Aileron Balancing; Balancing Equipment And Procedure - Piper PA-44-180 SEMINOLE Maintenance Manual

AILERON STATIC
BALANCE LIMITS (IN.-LBS.)
LEADING
EDGE
HEAVY
+1.5
BALANCING EQUIPMENT AND PROCEDURE. (Refer to Figure 57-3.)
The balancing must be done using a suitable tool capable of measuring unbalance in inch-pounds from the
hinge pin center line of the control surface. A suggested tool configuration is shown in Chapter 91 . Other tool
configurations may be used, provided accuracy is maintained and recalibration capability is provided. The tool
shown in Figure 57-3 is calibrated by placing it on the control surface to be balanced with the balance points over
the control surface hinge center line and the balance bar parallel to the cord line. Position the trailing edge
support to align the tool with the control surface cord line and secure in this position. Remove the tool without
disturbing the trailing edge support and balance the tool by adding weight to the light end as required. (The
movable weight must be at the center line of the bar.) Place the tool on the control surface perpendicular to the
hinge center line as shown in Figure 57-3. Read scale when the bubble level has been centered by adjustment of
the movable weight and determine the static balance. If the static balance is not within the limits specified.
proceed as follows:
1. Leading Edge Heavy: This condition is highly improbable; recheck measurements and calculations.
2. Trailing Edge Heavy: There are no provisions for adding weight to balance weight to counteract a trailing
edge heavy condition; therefore, it will be necessary to determine the exact cause of the unbalance. If the
aileron is too heavy because of painting over old paint, it will be necessary to strip all paint from the aileron
and repaint. If the aileron is too heavy resulting from repair to the skin or ribs, it will be necessary to replace
all damaged parts and recheck the balance.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
LEADING
EDGE
LIGHT
-2.0
Figure 57-3. Aileron Balancing
BALANCING TOOL
(REFER TO CHAPTER 91)
LEVEL SUPPORT
3C20
HOLDING FIXTURE
PPS50011
5 7 - 5 1 - 0 4
Page 57-09
Revised: May 15, 1989