DG Flugzeugbau DG-800A, Руководство по обслуживанию, Страница: 62 / 163

Maintenance Manual DG-808C
Issued: May 2012 TN 800/41 4.1
4 Detailed instructions for assembly and servicing work
4.1 Water-ballast system
see diagram 5 or 5a from ser.no. 8-373 on
Replacement of the water ballast bags:
Unscrew the bolt attaching the Perlon line to the root rib and attach an additional
6 m (20 ft) long Perlon line dia. 3 mm (.12 in.) to it. Also attach a line to the line
which is fixed at the front of the root rib.
Unscrew the water ballast dump valve cap nut which is near the wing root.
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. Replace the ballast tank and reverse the above procedures to install the
new tank.
Only Version DG-808C Competition: With the large wing tank 8F71 (75 l) the
check valve at the parting of the tank has to be taken out and to be installed in
the new tank.
Clean and test the check valve for proper function prior to reinstallation: When
you turn the valve so that the spring loaded pin points downwards, the pin must
be moved by the ball of the valve. Check both pins. For installation mount the
check valve on a rod dia. 10 mm, 3 m (10 ft.) long. The side without the turned
cut-out for the hose clamp is to be installed inboard.
All Versions: 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 this
method 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).
The front line should not be tensioned.
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 (see diagram 5) should be greased.
Fill the new water ballast tank(s) and check for water-tightness and test the
dump time.