Maintenance Manual STEMME S10-VT
Date of Issue: Jan. 01, 1998
Page 7-24
Amendment Nr. 0
Date: --
A4011121_B23.doc
Doc. No. A40-11-121
7.4.12 Front Gear, Mounting and Support
System Description:
See section 3.4.12
Check of Front Gear Assy
With front gear installed:
Check noise and circumferencial backlash of front gear by rotating propeller unit clock- and counter clock-
wise. Some backlash is allowable, in case of doubt contact manufacturer. Check front gear visually for
condition and leakage. Check tight fit of front gear assy in four rubber shock mounts on front fuselage frame.
Check weight balancing spring on front gear and its wire-securing. Check connection of propeller brake
control cable through hole in front fuselage frame. Check condition (composite structure, fastening spring
assy) and tight fit of lower front gear fairing.
Check quantity of oil to be between min and max markings of the inspection glass, with the tail cone
supported for its axis horizontal. The front gear may use only a minimum of oil, so normally refilling is not
required before scheduled oil change. Nevertheless some oil on the gear housing due to little oil vapour
leakage through the shaft sealings is normal.
With front gear removed
Check condition of front gear housing. Check the front gear for leakage, specially the screwing of both halves
of the gear housing and the shaft sealings. Check condition of the milled aluminium suspension (cracks) and
its connection to the front gear. Check condition and tight fit of the shock mount assemblies on the front
fuselage frame. Specially 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 chips
possibly collected. In case of larger amount of chips on the screw and in case of doubt contact the
manufacturer.
Front Gear Oil Change
To change oil completely suck out used oil by means of a flexible bottle with tube via thread opening of
magnetic screw. Refill new oil through same opening to max marking of inspection glass, again with the tail
cone supported for its axis horizontal. Wire-secure magnetic screw.
Oil specification:
see section 3.4.14