Paragraph 47 Display of lights by aircraft
During the night an aircraft shall—
display such of the lights specified in this Section as it is required by this Section; and
subject to rule 49(6), not display any other lights which might obscure or otherwise impair the visibility of, or be mistaken for, such lights.
Subject to rule 48(4) an aircraft fitted with an anti-collision light shall display that light in flight during the day.
A flying machine on a Territory aerodrome shall—
during the night display either the lights which it would be required to display when flying or the lights specified in rule 49(5)(c) unless it is stationary on the apron or on that part of the aerodrome provided for the maintenance of aircraft; and
during the day and night and subject to paragraph (4), display a red anti-collision light, if it is fitted with one, when it is stationary on the apron with engines running.
A helicopter to which article 66 applies may, when stationary on an offshore installation, switch off the anti-collision light required to be shown by paragraph (3)(b) as long as that is done in accordance with a procedure contained in the operations manual of the helicopter as a signal to ground personnel that it is safe to approach the helicopter for the purpose of embarkation or disembarkation of passengers or the loading or unloading of cargo.