Maintenance Manual DG-808C
Issued: May 2012
TN800/41
1.11
1.8
Water ballast system
1.8.1
Water ballast release circuit
see diagram 5
1.8.2
Wing tanks
Version DG-808C Classic:
double wall bags with a capacity of 50l per wing.
Version DG-808C Competition:
double wall bags with a capacity of 60l (15.85
U.S. gal) or 75l (19.8 U.S. gal) per wing. The 75l waterbags are separated in 2
chambers. A check-valve is located between the 2 chambers. Operating the
waterballast system without the check-valves is prohibited.
Both variants:
a)
Adjustment
For the dump valve in the closed position, there should be 1 mm (.04 in.)
space between the 8 mm (.315 in.) diameter PVC rod from the dump valve,
and the plate lever on the fuselage. Adjust at the adjustment screw located at
the fuselage wall. If this is insufficient, the 8 mm PVC rod can be shortened.
If a valve still leaks, then the rubber gasket and the associated spring at the
end of the 8mm PVC rod should be loosened, pressed further in and secured
again. If this is not successful, the valve ball seat should be greased. (see
sect. 4.1)
b)
Servicing
see section 4.1.
1.8.3
Fin tank (only version DG-808C Competition)
The fin ballast tank is constructed as integral tank.
a)
Adjustment
The release cable must be adjusted so that the cable just becomes loose when
the handle is parallel to the fuselage wall.
b)
Inspection
According to sect. 2.2 a special inspection is to be carried out on the fin
ballast tank system at each annual inspection.
1. The dump time of the full fin tank should be timed and should not exceed
120 seconds.
2. Check for correct indication of the outside air temperature gauge (in the
DEI-NT).
3.
Up to ser.no. 8-372:
Remove the tailwheel and the cover plate in the
tailwheel box. Check the control cable and the lever of the valve carefully
for wear. Check the control cable at the operating handle too. If the cable or
the lever is worn, further use of the fin tank is prohibited. Please contact the
manufacturer for a detailed repair instruction.
From ser. no. 8-373 on:
Check the control cable at the operating handle and
at the dump valve (installed in the lower rudder mounting bracket). If the
cable is worn, further use of the fin tank is prohibited.
Summary of Contents for DG-800A
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