LS10-s / LS10-st - DG Flugzeugbau

Flight manual <strong>LS10</strong>-s,-st
3.15 Flight with asymmetric waterballast
If a unsymmetrical dumping of waterballast results in a noticeable
unsymmetrical loading condition, the wingtank dump valves must be closed
immediately to avoid greater asymmetry.
Asymmetry can be verified by the necessity of aileron deflection in straight
flight at low airspeeds.
When flying with asymmetric waterballast you have to increase the
airspeed, especially in turns, in order to avoid a stall at all costs.
Fly the landing pattern and touch down approx. 10 km/h (6 kts.) faster than
usual and after touch down control carefully the bank angle to avoid the
heavier wing touching the ground too early.
3.16 Defective waterballast control or icing of the waterballast
Low force:
If the operating force of one or both of the control handles (system 1 or 2) is
uncommonly low (the force of the retaining springs may not be felt) one or
more of the dump valves will not be opened.
The handle for this ballast must be closed immediately. Dumping this ballast
system (wing tank combined with the fin tank) is strictly prohibited to
prevent an asymmetric loading condition.
High force:
If the operating force of one or both of the control handles (system 1 or 2) is
uncommonly high a failure in the mechanical dumping system or icing of
the valves may occur. In this situation the handle for this ballast must be
closed immediately. Dumping of this ballast system (wing tank combined
with the fin tank) is strictly prohibited to avoid an inadmissible aft C.G.
position.
Caution: In both cases a landing with full or partially depleted water ballast tanks
must be taken into consideration. Outlandings should be avoided.
Note: The valves of the fin ballast tanks are normally open. So with a broken
control cable the fin ballast tank will be dumped automatically.
Issued: October 2009 EASA app. 3.7