Paragraph 25 Flight within controlled airspace

(1)

Within Class B airspace:

(a)

an aircraft flying within Class B airspace at or above flight level 100 shall remain clear of cloud and in a flight visibility of at least 8 km;

(b)

an aircraft flying within Class B airspace below flight level 100 shall remain clear of cloud and in a flight visibility of at least 5 km.

(2)

Within Class C, Class D or Class E airspace:

(a)

an aircraft flying within Class C, Class D or Class E airspace at or above flight level 100 shall remain at least 1,500 metres horizontally and 1,000 feet vertically away from cloud and in a flight visibility of at least 8 km;

(b)

subject to sub-paragraph (c), an aircraft flying within Class C, Class D or Class E airspace below flight level 100 shall remain at least 1,500 metres horizontally and 1,000 feet vertically away from cloud and in a flight visibility of at least 5 km;

(c)

sub-paragraph (b) shall be deemed to be complied with if:

(i)

the aircraft is not a helicopter and is flying at or below 3,000 feet above mean sea level at a speed which, according to its airspeed indicator, is 140 knots or less and it remains clear of cloud, in sight of the surface and in a flight visibility of at least 5 km; or

(ii)

the aircraft is a helicopter flying at or below 3,000 feet above mean sea level and it remains clear of cloud and in sight of the surface.