Cessna 172 Maintenance Manual page 50

B. Underbalance (refer to Figure 4) is defined as the condition that exists when surface is trailing edge
heavy and is defined by symbol (+). If the balance beam uses a sliding weight, the weight must be
on the leading edge side of the hinge line (to balance the control surface), is considered to be under
balanced.
5. Control Surface Balance Requirements
NOTE: "Approved Flight" must never be exceeded when the surface is in its final configuration for flight.
A. Refer to Tables 1, 2 and 3 for balance limits of the various airplane control surfaces. These approved
flight limits must take into account all items which may be attached and/or applied to the various control
surfaces (static wicks, trim tabs, paint, decorative trim stripes, and so forth).
Table 1. Model 172 Static Balance Limits.
CONTROL SURFACE
AILERON
RUDDER
LEFT ELEVATOR
RIGHT ELEVATOR
CESSNA AIRCRAFT COMPANY
SINGLE ENGINE
STRUCTURAL REPAIR MANUAL
Control Surface Overbalance (-)
Figure 3
Control Surface Underbalance (+)
Figure 4
STATIC BALANCE LIMITS APPROVED FOR FLIGHT
CONFIGURATION (INCH-LBS).
0.0 TO +11.31
0.0 TO +9.0
0.0 TO +18.5
0.0 TO +24.5
© Cessna Aircraft Company
51-60-00
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Jun 1/2005