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3. Friction in Control System
Static friction is to be measured as follows: measuring point: 230mm [9.05 in.] above fulcrum of the operating lever / control
stick on the grip; measure the force being reached when the system sets going - three times in both directions. The average
of the higher values from each measurement is to be entered.
Prior to measuring trim should be positioned so as to center the stick approximately. To balance the "stick forward" force of
the downspring, the trim lever has to be locked at the rear, nearly fully "tail heavy" position.
Rated Reading *
Elevator 5 ± 2 N [1.1 ± 0.45 lbf] N [lbf]
Aileron 15
+5
/
-8
N [3.4
+1.1
/
-1.8
lbf] N [lbf]
Rudder (tail wheel off the ground!) 25
+5
/
-8
N [5.6
+1.1
/
-1.8
lbf] N [lbf]
4. Pilot Forces
Following forces must be measured on ground. Measuring points for airbrake and wing flap forces are the respective
handles, for down-spring / trim spring forces the uppermost finger notch of the control stick handle.
Rated Reading *
Airbrake over-center lock and unlock
150 + 50 N
[34 + 11 lbf]
at 20°C N [lbf] at [°C]
Wing Flap: Counter force in position L
125 ± 25 N
[28
±
6 lbf]
at 20°C N [lbf] at [°C]
with trim setting fully "nose down")
65 ± 5 N
[14.6
±
1.1 lbf]
at 20°C N [lbf] at [°C]
* Units: delete as applicable
Strausberg,
Site, date Stamp Sign Job Leader
Certification of the Inspector: All measured data are in the permissible range and comply with the Production and
Maintenance Instructions for the control system.
Strausberg,
Site, date Stamp Sign Inspector
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