USER MANUAL
UM-07 EN
Page 8
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Date of issue: 01.09.2015 Rev. 0
13.2.
Propeller Blades Assembly
Place propeller blades (pos. 3) to related position in hub (pos. 1, 2) – incorrect positioning is not
permitted!
Using supplied screws (pos. 8) without washers, tighten each blade but allow blade to still rotate. Pull the
blades in direction of centrifugal forces to remove axial play in the locked blades.
13.3.
Blade Angle / Pitch Setting
To adjust the angle of the propeller blades, place the hub with blades (pos. 1, 2, 3) on a horizontal plate
(check with a protractor). The angle set by carefully turning of the blades in the propeller hub. Blade
setting angle means the angle between the propeller rotation plane (in this case the horizontal plane on
which is placed the propeller hub) and a tangent to the lower (pressure) side of the blade profile at a
distance of 50 mm (2") from tip of the blade (end of colouring tip). Angle measurement is performed by
applying a suitable protractor or template on the bottom (pressure) side of the blade in that the distance
from the end.
After setting all blades to the desired angle, tighten each of the stems with 4 screws (pos. 8) using torque
of 10 Nm. Screws tighten step by step, cross. After tightening recheck setting of angles of the blades.
In the hole in of front half of the hub (pos. 2) insert the plug (pos. 13). The propeller is ready for
installation on the aircraft.
13.4.
Static Balancing
The final stage in production or maintenance the propeller is statically balanced on a precise instrument.
Propeller is balancing without spinner. Spinner assembly with back plate is balanced independently.
To keep adjusted balance, every part must be placed in the same position as before dismantling.
14.
Propeller Installation to the Aircraft
14.1.
Propeller without Spacer
Mount on engine flange backplate (pos. 4) and afterward propeller hub with blades (pos. 1, 2, 3). Attach
the propeller using 6 screws (pos. 9) with washers (pos. 10) and self-locking nuts (pos. 12). Tighten the
nuts using 22 Nm in the sequence as shown in Fig.1.
After tightening secure screws (pos. 9) in pairs using Ø 0.5mm stainless locking wire.
The spinner (pos. 5) attach on propeller in the position marked by red dots on the back plate - to ensure
fitting the spinner in the correct position. Tighten the spinner using 6 screws (pos. 14) with plastic washers
(pos. 15). Screws secure with Loctite 243.
Fig. 1- Sequence of tightening attachment screws
