Assertion: condition | /r/Desires | flight instruments
Facets:
value: for attitude control
type: PURPOSE
Source sentences:
text: It is possible to be flying VFR in conditions that are legally considered VMC and have to rely on flight instruments for attitude control because there is no distinct external horizon, for example, on a dark night over water (which may create a so-called black hole effect) or a clear night with lights on the water and stars in the sky looking the same.