# The Air Navigation (Isle of Man) Order 2007, Paragraph 1: General


(1) The nationality mark of the aircraft shall be the capital letter “M” in Roman character and the registration mark shall be a group of four capital letters in Roman character assigned by the Department on the registration of the aircraft. The letters shall be without ornamentation and a hyphen shall be placed between the nationality mark and the registration mark.
(2) The nationality and registration marks shall be displayed to the best advantage, taking into consideration the constructional features of the aircraft and shall always be kept clean and visible.
(3) The letters constituting each group of marks shall be of equal height and they, and the hyphen, shall all be of the same single colour which shall clearly contrast with the background on which they appear.
(4) The nationality and registration marks shall also be inscribed on a fire-proof metal plate affixed in a prominent position on the fuselage.
(5) The nationality and registration marks shall be painted on the aircraft, or shall be affixed thereto by any other means ensuring a similar degree of permanence, in the manner specified in paragraphs 2 and 3 of this Part.

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Source: https://www.legislation.gov.uk/uksi/2007/1115/schedule/1/part/B/paragraph/1 (the official version)
Page: https://openlegislation.uk/air-navigation-isle-of-man-order-2007/schedule-1/part-B/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.