Explanatory note

An aeroplane must fly at such a height as to be able to alight in the event of a power unit failure without danger to persons or property on the surface. (Rule 5(2)(c) and (e)).

The minimum height permitted over the congested areas of cities towns and settlements or in the vicinity of gatherings of more than 1,000 persons is 1,000 ft. (Rule 5(2)(c) and (e)).

An aircraft may not take off or land within 1,000 metres of open air assemblies of more than 1,000 persons except in accordance with procedures notified by the CAA. (Rule 5(2)(f)).

A balloon that is becalmed may land within a congested area. (Rule 5(3)(d)).

A helicopter is exempt from the 500 feet rule when conducting manoeuvres in accordance with normal aviation practice, within the boundaries of a licensed or Government aerodrome, or at other sites with the permission of the CAA. (Rule 5(3)(i)).

There is no exemption contained in Rule 5 permitting departure from the Rule where necessary for the purpose of saving life.

The restrictions on flying by single engine helicopters over central London are omitted from Rule 5 and are now set out in the Air Navigation (Restriction of Flying) (Specified Area) Regulations 2005 S.I. 2005/964.^f1.