BRP-Rotax
MAINTENANCE MANUAL LINE
PROPELLER GEARBOX
CHECKING THE PROPELLER GEARBOX
General note
See Heavy Maintenance Manual Heavy for the engine type .
The gearbox must be inspected, repaired or overhauled in accordance with the BRP-Ro-
tax instructions for continued airworthiness.
Detailed inspection of the affected gearbox components in accordance chapter 72-00-00
in the Heavy Maintenance Manual.
NDT Crack testing of the propeller shaft is not normally planned, but can be carried out if
cracks are suspected.
NOTE
The drive gear is considered part of the gearbox. Therefore it must be removed
from the crankshaft and be included when sending the gearbox for repairs or
overhaul.
CHECKING THE FRICTION TORQUE IN FREE ROTATION
General note
m WARNING
Risk of electric shock!
Ignition “OFF” and system grounded!
Test procedure The following steps are necessary for the testing procedure
Step
Procedure
1
Fit the crankshaft locking pin. See Chapter 12–20–00 section: Locking the
crankshaft.
2
With the crankshaft locked, the propeller can be turned by hand 15 or 30
degrees depending on the profile of the dog gears installed.
This is the maximum amount of movement allowed by the dog gears in the
torsional shock absorption unit.
3
Turn the propeller by hand back and forth between ramps, taking into con-
sideration the friction torque. No odd noises or irregular resistance must be
noticeable during this moment.
12–20–00
Page 60
January 01 2020
Effectivity: 912 Series
Rev. 0
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