STEMME S12

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 739
MAINTENANCE MANUAL STEMME S12
• Check tight t of propeller gearbox assy. in four rubber shock mounts on front fuselage
frame.
• Check weight balancing spring on propeller gearbox and its safety wire.
• Check connection of propeller brake control cable through hole in front fuselage frame.
•
Check condition (composite structure, fastening spring assy.) and tight t of lower
propeller gearbox fairing.
• Check quantity of oil to be between min. and max. markings of the inspection glass, with
the tail cone supported so that its axis is horizontal (approximate ight attitude). The
propeller gearbox should use only a minimum of oil, so normally relling is not required
before scheduled oil change. Nevertheless some oil on the gear housing due to minor oil
vapor leakage through the shaft seals is normal.
With propeller gearbox removed
• Check condition of propeller gearbox housing.
• Check the propeller gearbox for leakage, especially the screwing of both halves of the gear
housing and the shaft sealings.
•
Check condition of the milled aluminum suspension (cracks) and its connection to the
propeller gearbox.
• Check condition and tight t of the shock mount assemblies on the front fuselage frame.
Especially check shock mount assemblies for tight bonding between rubber discs and milled
suspension rings. In case of poor condition (cracks in milled suspension, rubber discs brittle
or loose) renew shock mounts.
• Check composite structure of front fuselage frame close to the shock mounts for signs of
overload.
CHECK OF MAGNET SCREW
Remove magnetic screw from the lower right front wall of the gear housing and inspect screw for
possibly collected chips. In case of signicant amount of chips on the screw and in case of doubt
contact the STEMME Service.
PROPELLER GEARBOX OIL CHANGE
To change oil completely suck out used oil by means of a exible bottle or syringe with tube
via thread opening of magnetic screw. Rell new oil through same opening to max marking of
inspection glass, again with the tail cone supported in ight attitude. Secure magnetic screw
with safety-wire.
Oil specication: See section 3.4.14