DG Flugzeugbau GmbH
Flight Manual LS 8-18 Normal
Procedures
4.5.10.2 Wing Tank Loading Procedure (after filling of tail tank)
(a)
Always place sailplane horizontal and fill outer tank first.
(b)
Connect small diameter wing tank adapter to filling funnel, use it to open outer tank
valve and brace taper into opening.
(c)
Fill half of desired total amount of water into wing via funnel.
(d)
For maximum approved amount of wing water ballast see tables on page 4-11.
Warning: Never fill wing with pressure from water pipe or from pump. Due to restricted
ventilation cross section the wing shell cannot withstand the pressure increase.
Therefore, always fill water using only the funnel!
(f)
When the outer integral tank is full, fill the inner tank with the rest of the desired amount
using the same procedure after connecting the large adapter to the funnel and bracing the
adapter by turning.
(g)
With wing tanks full, water leaks from the following position:
for both inner and outer tanks at the under side root rib draining orifice in front of the
spar.
(h)
Use as clean water as possible to ensure proper valve sealing and avoid clogging of
overflow pipes and draining orifices.
(i)
Fill the other wing as outlined above.
Warning: When amount of water ballast in wings is not equal, this may favour ground loop
tendencies during take off.
(j)
After filling ballast and before take-off the following must be checked:
(1)
Not even minor leaks at wing system allowed.
(2)
Tail tank valve opens
simultaneously with
or
before
wing valves.
Warning: Check proper dumping, tail fin system must start dumping together with wing
system to avoid C.G. shifting backwards.
Additionally see page 3.4 for freezing / icing.
4.5.10.3 Loading Plan for Water Ballast
Maximum approved capacity of integral tanks: about 95 kg <209 lbs> per wing
= total of ...................................
190.0
kg <419 lbs>
Maximum tail tank capacity: without battery box ........................
5.5
kg <12 lbs>
with battery box ........................
3.8
to 4.1 kg <8.4 to 9.0 lbs>
Integral
tank..................................
12.0
kg <24.5 lbs>
Tables on page 4-11 show maximum possible wing water ballast mass. (Water in wing
and
tail
tank) in relation to empty weight and cockpit load (Pilot + par equ baggage
compartment load).
Wing water ballast must always be compensated by tail tank water ballast according to table page
4-12; showing tail tank water amount in relation to wing water ballast amount.
Edition: July 1999
LBA-appr. Revision - 0
Page 4-10
