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rely upon the aircraft instrument indications.
during periods of restricted visibility
Visibility is quite restricted here at the moment. We're unable to see either the canyon above or the list of observations.
Lights must be on during periods of restricted visibility
Lights must be on during periods of restricted visibility
Something blocks your line of sight. On a road it could be hills, curves, etc.
rainbows ....... i think?
lights must be on during periods of restricted visibility
one prolonged blast
Navigation lights must be on during periods of restricted visibility.
one prolonged blast
5 seconds of rapid bell ringing