Rudder Balancing - Cessna 510 Mustang Structural Repair Manual

1. General
A. The rudder must be complete with the following components installed before performing the balancing check.
(1) Trim tab.
(2) Trim tab actuator, and actuator instrumentation cable.
(3) Static discharge wicks.
(4) Rudder torque tube bell crank.
(5) Exterior paint.
B. Balancing Limits.
(1) Balancing limits for the rudder are as follows:
(a) Rudder balance to be - +70.0 to +81.0 inch-pounds (underbalance) painted with or without the sector. This value
is equivalent to a scale reading of 3.33 pounds to 3.85 pounds (1.509 kg to 1.746 kg) .
(2) Maximum weight for the painted rudder is as follows:
(a) Rudder total weight with sector installed -- 36.3 pounds (16.46 kg).
(3) Balance Weight, Maximum adjustable: 1.32 pounds (598 g).
2.

Rudder Balancing

A. Setup (Refer to Figure 201).
(1) Install pins in upper and mid hinge fittings.
(2) Support rudder on knife edges at the upper and lower hinge fittings.
(3) Make sure that the trim tab is in neutral position by taping it with a minimum amount of tape.
B. Adjustment.
(1) Support the rudder by the mandrels and the weight scale so that the trailing edge is in same horizontal plane as hinge
centers.
(2) Determine the trailing edge heaviness 0.25 inch (6 mm) forward of the lower aft corner with the weight scale.
(a) Scale reading should be 3.33 pounds to 3.85 pounds (1.509 kg to 1.746 kg) for painted rudders with trim tab,
trim tab instrumentation cable, pushrods, static wicks, filler, primer and paint with or without bell crank installed.
(3) If the scale at the trailing edge indicates less than the limit indicated, the rudder is overbalanced and needs weight
removed. Remove weight as follows:
(a) Locate trim weights on leading edge of rudder bottom rib.
(b) Cut safety wire on screws securing trim weights on base of rudder
(c) Remove screws and washers securing trim weights. Remove trim weight(s) as required.
(d) Reinstall trim weights and secure with screws and washers. Recheck balance of rudder.
(e) When proper balance is achieved, safety wire trim weight attach screws.
(4) If scale at the trailing edge indicates greater than the limit indicated, the rudder is underbalanced and needs
additional weight added. Add weight as follows:
(a) Locate trim weights on leading edge of rudder bottom rib.
(b) Cut safety wire on screws securing trim weights on base of rudder.
(c) Remove screws and washers securing trim weights. Add trim weight(s) as required.
NOTE:
NOTE:
(d) Reinstall trim weights and secure with screws and washers. Recheck balance of rudder.
(e) When proper balance is achieved, safety wire trim weight attach screws.
(5) If rudder cannot be balanced within criteria specified in Balancing Limits, it will be necessary to remove all paint and
repaint the rudder.
Copyright © Textron Aviation Inc.
Retain printed data for historical reference only. For future maintenance, use only current data.
RUDDER BALANCING
A maximum of eight (8) trim weights may be added to the rudder.
Do not exceed balancing limits specified in paragraph 1., B.
FOR TRAINING PURPOSES ONLY
ISSUE 02 , JAN 2018
Model 510 Structural Repair Manual (Rev 2)
51-60-03-2 (Original Issue)
Print Date: Wed Mar 21 05:12:16 CDT 2018
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