DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 732
MAINTENANCE MANUAL STEMME S12
• Check propeller folding mechanism for ease of operation and restoring force.
• Check propeller blade ventilation and drain holes at the blade tips, clean if necessary.
If the ignition retarder module failed during engine start, the propeller must be checked for
damage. Special attention must be paid to the condition of the following items: blade side
rubber stops and surrounding blade structure, stop bolt in the blade suspension forks and the
blade retraction coupling levers.
7.4.10.4 REMOVAL OF THE PROPELLER UNIT
• Remove the nose-cone: remove left and right foot-well covers. Loosen clamp bolt at the
guide block of the nose-cone, pull out locking screw with nose-cone spring, pull o pitot/
static pressure lines, disconnect installed electrical wiring into the nose cone (XPDR an-
tenna, sensor units,etc.), pull nose-cone o to the front.
• Unscrew the front cover of the variable pitch mechanism.
• Unscrew both sides of the electric covers (three M3 bolts).
• Disconnect the power supply to the electric element on both sides.
• Disconnect the drive pin (10) from the fork (4), (one M5 bolt, one M8 nut, one of the two
adjustment screws (25), the second adjustment screw remains secured to facilitate nding
the original position).
NOTICE
A counter-balancing weight washer may be attached to the inside of the fork by means of an M5
bolt. This washer must be re-installed at the same place on re-assembly.
•
Loosen both bolts (M6 with secure washers) to separate the variable pitch mechanism from
the hub centerpiece (18). Remove the variable pitch mechanism to the front.
• Loosen the six M8 bolts (three bolts in each group secured with safety wire) connecting
propeller hub and propeller reduction gearbox. Remove the hub (with the propeller) to the
front.
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