{
  "url": "https://openlegislation.uk/rules-of-the-air-and-air-traffic-control-fourth-amendment-regulations-1987/note",
  "json_url": "https://openlegislation.uk/rules-of-the-air-and-air-traffic-control-fourth-amendment-regulations-1987/note.json",
  "legislation": "uksi/1987/1812",
  "legislation_title": "The Rules of the Air and Air Traffic Control (Fourth Amendment) Regulations 1987",
  "legislation_url": "https://openlegislation.uk/rules-of-the-air-and-air-traffic-control-fourth-amendment-regulations-1987",
  "path": "note",
  "kind": "note",
  "number": null,
  "heading": "Explanatory note",
  "text": "(This note is not part of the Regulations)\nThese Regulations amend the Rules of the Air and Air Traffic Control Regulations 1985. The principal changes are :\n(1) Rule 5 is amended so that when calculating the ability of an aircraft to alight clear of a congested area or an assembly in the open air of more than 1000 persons, if the aircraft is towing a banner, the calculation must be done on the basis that the banner will not be jettisoned whilst over the congested area or within 3000ft of such an assembly (regulation 2(1) and (2)).\n(2) Rule 9 is amended to require aircraft fitted with an anti-collision light to display such a light in flight by day, to require an aircraft to display specified lights at night whilst on the ground unless it is stationary in a specified part of an aerodrome, to require an aircraft to display an anti-collision light when stationary on the apron of an aerodrome with its engines running and to permit any flashing light to be switched off or reduced in intensity if it may adversely affect members of the flight crew or outside observers (regulation 2(3)).\n(3) Rule 10 is amended to permit an aircraft to continue to fly by day when its anti-collision light has failed subject to a specified condition (regulation 2(4)).\n(4) Rule 11 is amended to impose the requirements previously applying to aircraft having a maximum total weight authorised of more than 5700kg also on any other flying machine of a type first certified on or after 1st April 1988 (regulation 2(5) and (6)).\n(5) Rule 15 is amended to require an airship to display an anti-collision light while flying at night (regulation 2(7)).\n(6) A new rule 21A is added to permit gliders to enter specified airspace which is notified for the purpose of rule 21 without complying with the provision of rule 21 subject to compliance with such conditions as may be notified for the purpose of rule 21A (regulation 2(10)).\n(7) Rule 36 is amended to establish Special Rules Airspace at Belfast/Aldergrove Airport (regulation 2(11)).",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1987/1812/note",
    "retrieved_at": "2026-10-29T16:19:11.430744+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}