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Document No.: 304S/MM
Date of Issue:
08/14
3-9
H
P
H
Ltd.
3.10 Control Surface Moments
After repairs or new paint work, the following control surface moments must not
be exceeded:
Weight / Moment
Without static balances
Weight / Moment
With static balances
Elevator
m = 1,3 … 1.7 kg
M = 2.29 ... 2.9 kgcm
Siderudder
m = 4.6 … 5.9 kg
M = -0.6 … 0 kgcm
Aileron 1
inboard
m = 0.88 …1.12 kg
M = 0.15 … 0.4 kgcm
Aileron 2
Outboard root
m = 0.1.65 …2.1 kg
M = 0.3 … 0.7 kgcm
Aileron 3
Outboard tip
m = 0.2 …0.26 kg
M = 0.5 …0.66 kgcm
Flap
m = 3.8 …4.88 kg
M =1.2 … 1.8 kgcm
Should these values be exceeded, mass ballast is to be attached to the control
surfaces in front of the hinge line. This ballast should be distributed evenly over
the whole length in the case of the elevator, and only in areas where ballast is
attached already as in the case of the aileron and rudder. After installing
additional lead strips, check that the control surface movement has not been
restricted.
To measure the control surface moments, all control surfaces have to be
removed. The two elevator halves are to be assembled with the U-shaped drive
fitting, so that the moment for both the elevator halves including the drive fitting,
is measured.
FIG. 8
Establishing the control
surface moment
M = P x r
Control surface balancing on
hinge line
P is measured with the aid of a
postal scale
Mass - balast
