The Air Navigation Directions, 1932 (A.N.D.11) paragraphs 63 (1) (v) (g) and 99 (1) (f), require aircraft to be equipped with landing lights (lamps or wing tip flares) of an approved type for flights by night when passengers or goods are carried for hire or reward or when a pilot qualifying for a “B” Licence is carrying out night flying tests.
(1934), "Air Ministry Official Notices: Instructions to Aeroplane Owners and Ground Engineers on Essential Modifications", Aircraft Engineering and Aerospace Technology, Vol. 6 No. 11, pp. 307-307. https://doi.org/10.1108/eb029875
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