39.—(1) Subject to the provisions of this Article, an aircraft in flight shall not, by means external to the aircraft, tow any article, other than a glider, or pick up or raise any person, animal or article, unless the certificate of airworthiness issued or rendered valid in respect of that aircraft under the law of the country in which the aircraft is registered includes an express provision that is may be used for that purpose.
(2) An aircraft shall not launch or pick up tow ropes, banners or similar articles other than at an aerodrome.
(3) An aircraft in flight shall not tow any article, other than a glider, at night or when flight visibility is less than one nautical mile.
(4) The length of the combination of towing aircraft, tow rope, and article in tow, shall not exceed 150 metres.
(5) A helicopter shall not fly at any height over a congested area of a city, town or settlement at any time when any person, article or animal is suspended from the helicopter.
(6) A passenger shall not be carried in a helicopter at any time when an article, person or animal is suspended therefrom, other than a passenger who has duties to perform in connection with the article, person or animal or a passenger who has been picked up or raised by means external to the helicopter or a passenger who it is intended shall be lowered to the surface by such means.
(7) Nothing in this Article shall—
(a)prohibit the towing in a reasonable manner by an aircraft in flight of any radio aerial, any instrument which is being used for experimental purposes, or any signal, apparatus or article required or permitted by or under this Order to be towed or displayed by an aircraft in flight;
(b)prohibit the picking up or raising of any person, animal or article in an emergency or for the purpose of saving life;
(c)apply to any aircraft while it is flying in accordance with the “B Conditions” set forth in Schedule 2 to this Order;
(d)be taken to permit the towing or picking up of a glider otherwise than in accordance with Article 38 of this Order.