BRP-Rotax
MAINTENANCE MANUAL LINE
Step
Procedure
4
Attach a calibrated spring scale to the propeller in distance (L) from the cen-
ter of the propeller. Measure the force required to pull the propeller through
the 15 or 30 degree range of free rotation.
5
Calculate friction torque (Nm) by multiplying the force (N) obtained on the
spring scale by the distance the scale is attached from the center of the pro-
peller (L).
The friction torque must be between 30 Nm and max. 70 Nm (22 to 51.6 ft.
lb). See calculation example.
ATTENTION
If the above mentioned friction torque value is not achieved, inspect, repair or
overhaul the gearbox in accordance with the instructions for continued
airworthiness.
Step
Procedure
6
Remove crankshaft locking pin. See Chapter 12–20–00 section: Locking
the crankshaft.
Figure 7.33: Checking the friction torque
Effectivity: 912 Series
Rev. 0
12–20–00
Page 61
January 01 2020
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