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
3 Inspections
3.1 Regular inspections
3.1.1 Daily Inspections
Daily Inspections and preflight check see flight manual
LS4 and LS4-a: page 3-4
LS4-b: section 4.3 and 4.4
Postflight check see flight manual
LS4 and LS4-a: page 3-5
LS4-b: section 4.6
3.1.2 Annual Inspections
1. The aileron sandwich shell is pressure-sensitive. If there are any pressure
marks the sailplane may be no more airworthy. Because of resulting
possible danger of flutter you must contact DG Flugzeugbau GmbH for
damage classification and repair.
2. Only LS4-b: The automatic aileron connectors at the fuselage have
deflectors to prevent incorrect mounting.
Check if rigging of the second wing is impossible with intentionally
incorrect aileron deflection (aileron deflected upward).
3. Lubricate various parts according to plan see section 3.4
4. Protect gelcoat with car polish (see section 12). This wax film protects the
gelcoat against brittleness and cracking due to ultra violet light. If you use
a polishing machine, be careful not to damage anti-collision colour
marking or registration signs or seals.
5. Only LS4 and LS4-a: Check gap sealing tape on aileron upper side
(textile tape) for existence and if tape has shrunk. Replace if necessary
according to section 4.2.2.1.
LS4-b, LS4 and LS4-a optionally: Check gap seals on aileron upper side
(plastic sealing strips and internal seals) for existence and damage.
Replace if necessary according to section 4.2.2.2.
6. Check gap seals on elevator and rudder for existence and damage.
Replace if necessary according to sections 4.2.3 and 4.2.4.
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