DG -500 ELAN ORION, Руководство по обслуживанию, Страница: 40 / 78

Flight manual DG-500 ELAN ORION
4.5.9 Flight at high altitude and at low temperatures
With temperatures below 0°C (32°F) for instance when wave flying or flying
in winter, it is possible that the control circuits could become stiffer. Special
care should be taken to ensure that there is no moisture on any section of the
control circuits to minimize the possibility of freeze up. It could be
advantageous to apply Vaseline along all the edges of the airbrake cover plates
to minimize the possibility of freezing closed.
Apply the controls in short periods.
It is not allowed to carry waterballast.
Caution:
1. At temperatures below -20°C (-4°F) there is the risk of cracking the gelcoat.
2. Attention must be paid to the fact that at higher altitudes the true airspeed is
grater than the indicated airspeed.
The max. speed VNE is reduced. See the following table:
Altitude in
Metres 0-2000 3000 4000 5000 6000
VNE IAS km/h 270 256 243 230 218
Altitude in
ft. 0-6600 10000 13000 16000 20000
VNE IAS kts. 146 138 131 124 117
3. Dump the water ballast before you reach freezing altitude or descend to
lower altitudes.
4. Do not fly below 0°C (32°F) when your glider is wet (e.g. after rain).
4.5.10
Flight in rain and thunderstorms
With light rain the stall speed and the sink rate increases slightly and the
approach speed has to be increased.
Warning: Flights and especially winch launches in the vicinity of thunder
storms should be avoided. Due to lightning discharge, carbon fibre structures
may be destroyed.
4.5.11 Cloud flying
(only without waterballast and)
Take care to fly smoothly and coordinated. It is prohibited to use a spin as a
method for loosing altitude in the clouds. In case of emergency, pull out the
dive brakes fully before exceeding a speed of 200 km/h and dive with max.
200 km/h (108 kts) to leave the cloud.
Warning: Flying in or near thunderstorm-clouds is prohibited.
Issued:
May 2008 TN348/20 App. 4.15