DG Flugzeugbau GmbH
Flight manual DG-500M
4.2.2 Filling the wing water ballast tanks (Option)
To fill the water ballast, pull back the lever (top-right tank, bottom-left
tank) in the cockpit.
Place one wingtip on the ground. Attach the hose supplied with your
glider in the water outlet on the lower surface of the wing.
Warning: Fill the hose from your water containers but never from a
mains pressure water supply. Filling the wing tanks with excessive
pressure (more than 0.2 bar, 3 psi) will definitely burst the wing shell!
Caution: If the tanks are to be filled up completely you must suck the air
out of the tanks with the filling hose.
Fill with the desired amount of water regarding the loading chart see
sect. 6. After filling close the valve with the water ballast lever and
remove the hose. Place the other wingtip on the ground and fill the other
tank.
In case a valve leaks slightly, you may try to pull out the PVC pushrod of
the valve to stop the leak. If this cannot be done successfully refer to
maintenance manual 1.8.2. and 4.1.
It is not allowed to fly with leaking watertanks,as this may result in
asymmetrical loading condition.
After filling the tanks, check to see if the wings are balanced. If one wing
is heavier, dump enough water to balance the wings.
Issued: April 1997 App. 4.4
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