PIK-20 E Service manual
Remove the control surfaces while balancing. The balancing is made
by suspending the control surface at the hinges and then measuring the
weight at the surface trailing edge with a sensitive scale. The control
surface must be horizontal in order to get a correct result.
The moment (product F a) and the total mass m must be within the given
limits.
Moment
(kgmm)
Total mass
(kg)
Aileron
46— 61
1.8—2.3
Flap
119—154
3.7—4.9
Rudder
52— 68
4.0—5.3
Elevator
41- 51
1.8—2.3
FIG 4.3: Balancing of the control surface
?
=5, ) jXjC.of G.
m = total mass of the control surface (kg)
F = the scale reading (kg)
a = the distance between the scale supporting point and the hinge line
(mm)
F-a = moment (kgmm)
Note: The given moment of the rudder balances also the tail wheel. That
is why a tail wheel of the same weight as the original wheel must be
used.
Note: After having replaced the cockpit floor and flap and trim position
plate, it must be checkd that the stick moves freely with all flap positi
ons.
EIRI KY -
Kisällinkatu 8
SF-15170 Lahti 17
______ y
Revision 4.15.3.-80
page 11-31
