Paragraph 20 Supplementary markings for use on unpaved manoeuvring areasI1

Markers with orange and white stripes of an equal width of 50 centimetres, with an orange stripe at each end, alternating with flags 60 centimetres square showing equal orange and white triangular areas, spaced not more than 90 metres apart, as illustrated in the diagram in this paragraph—

indicate the boundary of an area unfit for the movement of aircraft.

Striped markers, as specified in paragraph (1), spaced not more than 45 metres apart, indicate the boundary of an aerodrome.

On structures markers with orange and white vertical stripes, of an equal width of 50 centimetres, with an orange stripe at each end, spaced not more than 45 metres apart, as illustrated in the diagram in this paragraph—

indicate the boundary of an aerodrome.

The pattern of the marker referred to in sub-paragraph (3) must be visible from inside and outside the aerodrome and the marker must be affixed not more than 15 centimetres from the top of the structure.

White, flat, rectangular markers 3 metres long and 1 metre wide, at intervals not exceeding 90 metres, flush with the surface of an unpaved runway or stopway, indicate the boundary of the unpaved runway or stopway.

A white letter H, as illustrated in the diagram in this paragraph—

indicates an area which must be used only for the taking off and landing of helicopters.

A yellow cross with two arms each 6 metres long by 1 metre wide at right angles, indicates that tow ropes, banners and similar articles towed by aircraft must only be picked up and dropped in the area in which the cross is placed.

A white letter ‘T’, as specified in SERA, Appendix 1, paragraph 3.2.5.1, placed at the left-hand side of a runway (when viewed from the direction of landing), also indicates the runway to be used for take-off and landing.