# The Rules of the Air Regulations 1996, Paragraph 42: General


(1) When any signal specified in the following paragraphs of this rule is displayed it shall be placed in a signals area, which shall be a square visible from all directions bordered by a white strip 30 centimetres wide the internal sides measuring 12 metres.
(2) A white landing T, as illustrated in this paragraph,
Fig. 1
signifies that aeroplanes and gliders taking off or landing shall do so in a direction parallel with the shaft of the T and towards the cross arm, unless otherwise authorised by the appropriate air traffic control unit.
(3) A white disc 60 centimetres in diameter displayed alongside the cross arm of the T and in line with the shaft of the T, as illustrated in this paragraph,
Fig. 2
signifies that the direction of landing and take off do not necessarily coincide.
(4) A white dumb-bell, as illustrated in this paragraph,
Fig. 3
signifies that movements of aeroplanes and gliders on the ground shall be confined to paved, metalled or similar hard surfaces.
(5) A white dumb-bell as described in (4) above but with a black strip 60 centimetres wide across each disc at right angles to the shaft of the dumb-bell, as illustrated in this paragraph,
Fig. 4
signifies that aeroplanes and gliders taking off or landing shall do so on a runway but that movement on the ground is not confined to paved, metalled or similar hard surfaces.
(6) A red and yellow striped arrow, as illustrated in this paragraph,
Fig. 5
the shaft of which is one metre wide placed along the whole or a total of 11 metres of two adjacent sides of the signals area and pointing in a clockwise direction signifies that a right-hand circuit is in force.
(7) A red panel 3 metres square with a yellow strip along one diagonal 50 centimetres wide, as illustrated in this paragraph,
Fig. 6
signifies that the state of the manoeuvring area is poor and pilots must exercise special care when landing.
(8) A red panel 3 metres square with a yellow strip, 50 centimetres wide, along each diagonal, as illustrated in this paragraph,
Fig. 7
signifies that the aerodrome is unsafe for the movement of aircraft and that landing on the aerodrome is prohibited.
(9) A white letter H, as illustrated in this paragraph,
Fig. 8
signifies that helicopters shall take off and land only within the area designated by the marking specified in rule 44(5).
(10) A red letter L displayed on the dumb-bell specified in paragraphs (4) and (5), as illustrated in this paragraph,
Fig. 9
signifies that light aircraft are permitted to take off and land either on a runway or on the area designated by the marking specified in rule 44(6).
(11) A white double cross, as illustrated in this paragraph,
Fig. 10
signifies that glider flying is in progress.

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Source: https://www.legislation.gov.uk/uksi/1996/1393/schedule/FIRST/paragraph/42 (the official version)
Page: https://openlegislation.uk/rules-of-the-air-regulations-1996/schedule-FIRST/paragraph-42
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.