DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: --
CHAPTER-
PAGE 3-28
MAINTENANCE MANUAL STEMME S12
3.4.13.3
PROPELLER BRAKE
The propeller brake is used to decelerate the propeller rotation to a full stop after engine shut
down in flight, to allow folding of the propeller by spring forces. It is operated by a pull handle on
the lower instrument panel
(see figure »3.2.3.a«).
The propeller brake is driven by a bowden cable, routed from the handle through the front fuse-
lage frame to the propeller brake assy., which is mounted on the rear housing of the front gear.
The cable is connected to a spring-loaded shift lever, which is mounted on the lower front gear
housing and pulls down one terminal of a brake belt during operation of the brake. The brake
band consists of a steel sheet with a riveted brake lining. The brake band is installed around a
brake drum mounted on the propeller drive shaft of the propeller gearbox. The second brake band
terminal is fastened to the gear housing opposite the other, driven, terminal. Some adjustment
of the clearance between brake lining and drive shaft is possible by loosening and shifting the
bowden cable support.
3.4.14 FLUIDS
3.4.14.1
FUEL
It is recommended to use premium gasoline, unleaded, minimum RON 95.
Suitable fuels:
• Super DIN EN 228
• Super Plus DIN EN 228
ACCORDING DOT
Gasoline min. grade 1, AKI 90.0, acc. to Canadian General Standard Board CAN/CGBS 3.5
(Unleaded Automotive Gasoline)
ACCORDING FAA
Standard Specification for Automotive Spark-Ignition Engine Fuel, ASTM D 4814
AVGAS 100LL
When using AVGAS 100LL, valve seats are stressed by the high amount of lead and in addition
combustion chambers will accumulate residues. AVGAS should be used only in case of fuel vapor
problems or if other fuel is not available.
CAUTION
The engine manufacturer recommends not to use AVGAS for an extended period, because an
increased amount of residues may accumulate in the engine.
Summary of Contents for S12
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Page 255: ...A FLIGHT CONTROLS PITCH CONTROL AND TRIM ...
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