DG Flugzeugbau GmbH
Flight Manual LS 8-18 Normal
Procedures
4.5.10 Water Ballast
(a)
Use clear water without any additives.
(b)
For 4” wheel only:
Increase tyre pressure to 4 bar < 58 psi>, when using full water ballast.
Step (b) does not apply when TN8020 has been executed.
(c)
Wing integral tanks together hold about 190 Litres <50.2 US gallons, 41.8 Imp. gallons >.
(d)
Maximum permissible water ballast depends on loading conditions, see pages 4-11 ff.
(e)
Two tanks per wing.
(f)
Tail tank (3.8 to 5.5 Litres <1 to 1.5 US gallons, 0.84 to 1.21 Imp. gallons>)
has 2 cockpit
water ballast levers: the short one opens the inner wing tanks only, both levers open both
tanks; the tail tanks always opens during operation of one of these levers.
or
Tail integral tank (12 Litres <3.2 US gallons, 2.64 Imp. gallons>)
has 1 cockpit water
ballast lever operating all tanks simultaneously.
Important Note:
When using water ballast, always fill outer wing tanks first, thereafter fill inner
tanks with the remaining amount.
Outer tanks each carry about 30 Litres <7.9 US gallons, 6.6 Imp. gallons>,
inner tanks each carry about 65 Litres <17.2 US gallons, 14.3 Imp. gallons>.
(g)
Use as clean water as possible to avoid damage of sealing rings by foreign matter.
(h)
Filling sequence
: always tail tank first, then wing tanks.
Warning: Wing water ballast always must be compensated by tail tank water according to
table page 4-12.
4.5.10.1 Vertical Tail Fin Tank Loading Procedure
(a)
Open dump valves by shifting lever or levers in cockpit forward.
(b)
Insert tail fin tank adapter to filling funnel tube and connect to dumping outlet just inside
lower right rudder cut-out, with rudder deflected to the left.
(c)
Fill tail fin tank via funnel in relation to intended wing water amount, see table page 4-12.
(d)
Markings correspond to 0.5 Litres <0.13 US gallons, 0.11 Imp. gallons> steps,
equivalent to 0.5 kg <1.1 lbs>
.
(e)
Use water level in funnel tube relative to markings on inside of translucent right rudder gap
seal to determine correct amount in relation to wing amount. Specified amount of water
must be verified thus:
1.
Wings level
2.
Landing gear and tail end on ground
3.
Filling tube near markings
(f)
Upper red marking corresponds to maximum amount of tail fin water ballast:
5,5 Litres <1.45 US gallons, 1.21 Imp. gallons>
3,8 to 4,1 Litres <1.00 to 1.08 US gal., 0.84 to 0.9 Imp.gal.> for the combination of tail
fin tank with tail fin battery box
12 Litres <3.17 US gal., 2.64 Imp. gal.> for the integral tail fin tank.
(g)
For trimming of heavy pilots, the
combination of battery and/or water can be chosen
, see
also entries on page 6-1/2.
(h)
Close dump valves by shifting single or double cockpit lever backward and remove funnel
from tail. For filling of wing tanks, the cockpit levers must stay in the closed position.
Warning: Mandatory tail tank filling always exactly to markings under right rudder seal and
filling tube water level in correct relation to total wing water amount according to
table page 4-12. Otherwise, keeping to the maximum approved rear C.G. position
cannot be guaranteed.
Warning: Filling funnel meshing is mandatory to guarantee tail fin tank valve function.
Edition: September 2011
EASA-appr. Revision – 3 (TN 8020)
Page 4-9
