STEMME S12, Maintenance Manual

Page: 143 / 290

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: --
CHAPTER- PAGE 6-1
MAINTENANCE MANUAL STEMME S12
6. MAINTENANCE INSTRUCTIONS, TOLERANCES, ADJUSTMENT DATA FOR THE
AIRCRAFT
6.1 GENERAL REMARKS
This section includes maintenance instructions, tolerances and adjustment data relevant to or
summarized for the entire motorglider. The instructions in section »7« for assemblies refer to this
section, if affected.
Forms related to inspections described in this section (weight and balance, controls adjustment,
control surface weights and hinge moments, propeller adjustment) are provided in Annex D of
this S12 Maintenance Manual and include further information about performing the inspections.
6.2 TOWING ON GROUND, JACK POINTS AND LIFTING
The S12 may only be towed in flight direction, since the tail wheel deflection is limited to 30° in
both directions.
For ground towing two ropes of textile material of at least 10 m / 32.80 ft each are needed. They
should be attached to the front struts of the main landing gear as low as possible (pay attention
to the hydraulic brake pipes). An instructed person should be seated in the cockpit. The towing
speed should be no faster then a walk.
For maneuvering on the ground, the manufacturer offers a tail wheel dolly. The aircraft may be
pushed backwards on level surface over a short distance without a tail wheel dolly, if the rudder
is controlled by hand.
Supporting points for lifting the aircraft are on the wing bottom surface in the spar area, about
1 m / 3.28 ft from the fuselage (position of the wing spar can be determined by light tapping).
The tail section is lifted approximately 0.5 m / 19.68 in supporting the tail wheel.
The wing supports for lifting must have an area of at least 0.2 m x 0.3 m / 9 in x 12 in (the longer
side in direction of wing span). A plywood sheet of 0.05 mm / 1.97 in thickness with a felt layer of
0.15 m to 0.2 m / 0.6 to 0.9 in thickness or a comparative device must be used. The support under
the plywood sheet center must be flexible so that it adapts to the wing contour and the wing is
evenly supported by the plywood plate.
The support must be capable of safely carrying the aircraft weight and be sufficiently stable. The
supporting surface may not be slippery.
WARNING
To avoid deformation and/or fatal damage of the wing shell and spar, ensure that the wings are
lifted simultaneously and that the supports are correctly positioned.