DG Flugzeugbau LS4 Maintenance Manual page 52

Annual Inspections continued
7. LS4-b, LS4 and LS4-a optionally: Check 3D turbulator (zig-zag tape)
on wing lower side (flight performace!) and restore if necessary.
Insatllation see section 4.2.5.
8. Check airbrakes
a) Only LS4-b: Check air brake friction damper at outer side of air
brake box for proper operation of damper rod and pads free from
grease.
b) All LS4 variants: Check wing air brake levers for corrosion at lower
end.
Pull with about 25 kg <55 lbs> force at upper end of each lever
against flight direction, simultaneously retract without twisting upper
blade (do not counter hold at cockpit lever!).
When under load of last item jamming at wing structure results, then
bearings at related lever must be exchanged immediately by repair
station according to repair instruction "Air Brake Levers".
9. Check landing gear folding strut for
a) proper overcenter lock of folding strut
b) pre-load of folding strut
For testing press against the pre-load until the strut starts folding, the
force should be in the limits see sketch. In case the pre-load is too small,
the landing the gear drive gas strut must be exchanged.
c) rubber torsion elements for deformation or separation of rubber from
metal.
d) When adjustments are being made, check for identical overcenter lock at
both folding struts and for locking of adjusters.
pre-load 120 – 150 N
< 26.46 – 33.07 lbs.>
Issued: May 2011
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Manual valid with the up-to-date cover page only
Maintenance Manual LS4
3-2