DG Flugzeugbau LS4 Maintenance Manual page 53

Annual Inspections continued
10. Perform Annual Inspection according to checklist in section 14.1.
The annual inspection contains items (aileron lateral bearing play, aileron
vent holes), which may only be checked after removing seals. Unless
changes are suspected (for instance lateral control surface gaps differing
from design values see section 4.1), it is not necessary to remove
(destroy) seals just for inspection purposes. Existence of retaining washer
at fixed bearings can be checked after lifting sealing strips cautiously.
11. Check water ballast bags and vertical tail fin tank (if existent) for
function (for instance chafe marks, tightness etc.). Leaking system parts –
water dripping from drain ports – must be uninstalled and repaired. Wire
meshing at tail fin tank upper end and in filling funnel are mandatory to
establish proper function of vertical tail fin valve. With fin tank installed
the fin tank filling hose must be with the glider (minimum equipment!).
12. With fin tank installed: Outside air temperature gauge - check for correct
indication, e.g. by comparing with another thermometer.
13. Check canopy locking and emergency release function according to
section 4.9:
Measure force to open canopy emergency release according to section 4.9.
Only LS4-b: If this measurement or an operational check is performed
without a helper, the spring at the LS-Latch (Röger hook) TN 4032
located at the fuselage becomes deformed and must be exchanged!.
14. LS4-b, with TN 4032 executed also LS4 and LS4-a:
Check function of LS-latch (Röger hook) for canopy emergency release
according to section 4.9.
Issued: May 2011
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Manual valid with the up-to-date cover page only
Maintenance Manual LS4
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