Maintenance Manual LS4
Issued: May 2011
Copyright DG Flugzeugbau GmbH - any copy or publishing prohibited
Manual valid with the up-to-date cover page only
5.3 Control surfaces free play
(Should be inspected annually)
Free play should be measured with control stick fixed to neutral position.
Measure at the trailing edge of the control surface.
Elevator: maximum 3 mm (0.12 in) at inner edge
Aileron: maximum 3 mm (0.12 in) at inner edge
Rudder: not applicable
5.4 Control surfaces friction
(Should be inspected annually)
Elevator: maximum 1.5 N <0.331 lbs) at 30 mm <1.2 in.> below top end of
control stick
Aileron LS4 and LS4-a with fabric tape seal at upper side (see section
4.2.2.1): approx. 2 N <0.441 lbs> at 30 mm <1.2 in.> below top end of
control stick
Aileron LS4-b and LS4 and LS4-a optionally with complete seal (see
section 4.2.2.2): 2 N up to 5 N <0.441 to 1.102 lbs> at 30 mm <1.2 in.>
below top end of control stick
Rudder: up to 5 N <1.102 lbs> at reference point 310mm <12.2 in.> behind
hinge line
Caution: The seals must be installed for measurement.
Measuring technique for friction:
All surfaces: Use a spring balance with suitable measuring range.
Start measurement from neutral position of control surface. Measure the
force when the control or surface starts moving. Don’t measure at larger
defelctions. Measure in both directions.
Elevator friction should be measured with trim setting neutral.
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