GM1 SAO.IDE.105(b)
Flight and navigational instruments
CONDITIONS WHERE THE SAILPLANE CANNOT BE MAINTAINED IN A DESIRED ATTITUDE WITHOUT REFERENCE TO ONE OR MORE ADDITIONAL INSTRUMENTS
Sailplanes
operating in conditions where the sailplane cannot be maintained in a desired
attitude without reference to one or more additional instruments refers to a
condition where the sailplane is still operating under visual flight rules
(VFR), under visual meteorological conditions (VMC), although there is no
external reference such as the natural horizon or a coastline, that would
allow the attitude to be maintained. Such conditions may occur over water, in
a desert or in snow-covered areas where the colour of the surface cannot be
distinguished from the colour of the sky and therefore no external reference
is available. Cloud flying is not considered to be one of these conditions.
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