STEMME S12, Maintenance Manual

Page: 160 / 290

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: --
CHAPTER- PAGE 7-2
MAINTENANCE MANUAL STEMME S12
CLEARANCE OF OUTER WING TO WING EXTENSION ATTACHMENTS
Front and rear bolts, axial: Maximum of 0.3 mm / 0.012 in each
Front and rear bolts, radial Maximum 0.2 mm / 0.008 in each
Main bolt, radial: Maximum of 0.15 mm / 0.006 in
in the bearings of spar boxes
Spar stub bolts axial: Maximum 2 mm / 0.08 in
Spar stub bolts radial: Maximum 0.2 mm / 0.008 in
These clearances are maximum allowable wears. If exceeded, the relevant bolt must be replaced
(the shear bolts at the inner-outer wing connection are provided with a thread).
• Check bushings for size, roundness and surface quality (striations). If necessary the bushings
must be reamed out and oversize bolts, available from the manufacturer, must be used.
CAUTION
Upon replacement of the bolts secure with Loctite type 638.
7.1.1.4 FLAPS AND AILERONS
• Check flaps for cracks, abnormal surface (local buckling, roughness, holes and
delamination) and corrosion, especially near force transmission points (fittings, control
links, flap hinges).
• Check wing flaps and aileron bearings for backlash (must be minimal).
• Check clearance between components and to wing spanwise.
• Check gap seals and tight fit of fairings on flap/aileron links.
Upon repair and re-painting the control surfaces weights and static hinge moments must be
measured. If the limits are exceeded, contact the manufacturer.
Weights and Hinge Moments: See section »6.4.2«
Deflections: See section »6.4.1.1«
Clearance of Flaps: In span direction and against each other
3 ± 0.5 mm / 0.12 ± 0.02 in