TOMARK, s.r.o.
Airplane Maintenance Manual
Chapter 51 Standard Practices Structure
Page 140 Issue: 28.FEB 2017
▶ Place control surfaces (1) friction free on two mandrels. Bolts in ball
bearings need to be in line and aligned horizontally.
▶ Check that the mandrels do not interfere with the control surfaces.
NOTE LH and RH elevator half can be measured individual.
▶ Determine control surface support weight at the given weighing
points (see figures 21 thru 24) with the surfaces (1) in level attitude.
Use a conventional spring balance (2) or table balance.
▶ Enter the support weights in the table and enter in respective column
of record form.
▶ Measure distances of hinge center line (4) to weighing points and
enter the values in record form.
▶ Calculate the control surface moments and note in record sheet
NOTE Limits given in the result form are for the finished part with mass
balancing weights (if applicable – not for Viper), trim tabs and surface
treatment.
▶ Check that weight and balance are within limits. If rework is required,
contact
TOMARK
.
▶ (Re-) Install the control surfaces only if the weight and moment values
fall within limits.
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