DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE:
CHAPTERPAGE 326
MAINTENANCE MANUAL STEMME S12
3.4.10.6 IDENTIFICATION OF PROPELLER SYSTEM AND ASSEMBLY
Complete Propeller 11 AP V / XXXXX / YYYY
Propeller Blade 11 AP VB / XXXXX - ZZ
X Number of ordering for production share (corresponds to the aircraft serial no. for
complete propeller); 5 digits, starting with 30001, in addition 20038;
Y Month and Year of production, 4 digits;
Z Consecutive number of production share, 2 digits.
3.4.11 POWER TRANSMISSION
The components of the power transmission system are:
•
Centrifugal clutch (in between engine and drive shaft): A force transmitting clutch actuated
by direction of rotation and rotating speed. Since the centrifugal clutch transmits torque
by friction, it is also an overload protection.
• Drive shaft.
• Flexible coupling forward and aft, allowing for angular and torsional elasticity.
The rear terminal of the drive shaft is maintenance-free due to a hard lm coating (30 m), which
also is anti-corrosive. The sliding friction coecient decreases with increasing torque by design.
Optimum behavior of the coating is only attained if not greased. The condition of the coating
should be checked regularly (refer to section 5.4.16).
3.4.12 FORWARD PROPELLER REDUCTION GEARBOX
The propeller reduction gearbox utilizes helical gears in an cast aluminum housing with a gear
ratio of 1.109. It is almost maintenance-free. Propeller reduction gear oil level can be checked by
means of an inspection glass with MIN/MAX markings. The extension shaft is connected to the
lower gear drive shaft with a exible coupling. The propeller is mounted on the upper propeller
shaft of the reduction gearbox.
The reduction gearbox is attached to a milled aluminum suspension, which is supported by 4 shock
mounts in the fuselage front frame to reduce vibrations. The cut-outs in the front frame for the
shock mounts are sealed by rubber adapter shapes.
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