Detailed Instructions For Assembly And Servicing Work; Water Ballast System - DG Flugzeugbau DG-1000T Maintenance Manual

Maintenance Manual DG-1000T

4 Detailed instructions for assembly and servicing work

4.1 Water ballast system

see diagram 6
Replacement of the water ballast bags and servicing the dump valves:
Unscrew the bolt attaching the perlon line to the root rib and attach an additional
5 m (17 ft) long perlon line dia. 3 mm (.12 in.) to it.
Unscrew the water ballast dump valve cap nut. Remove the dump valve with
attached water ballast bag out of its wing stand by pushing the valve towards the
wingtip. Remove the valve and ballast tank through the hole in the wing root.
Remove the perlon line and loosen the hose clamp.
Assemble the new tank to the valve body. Therefore apply some silicone seal
agent onto the neck of the valve body.
Before reassembling the hose clamp wrap fabric tape (Tesaband 651) 3 times
around the bag at this place.
The lines holding the tank are to be fixed so that the key ring will remain 5 cm
(2 in.) inside of the wing when the lines are just tensioned. By doing this the
tension of the lines will be satisfactory even if the lines strain.
Every 3 months you should check that the lines are still tensioned. If not, undo
the knot and tie it again to the key ring (see above).
Each time you unscrew the valve, grease its thread, otherwise you won't be able
to open it again. The seat of the valve ball should be greased. Fill the new water
ballast tank(s) and check for water tightness and test the dump time.
Issued: December 2005 4.1