Paragraph 27 Flight within controlled airspace

(1)

Subject to paragraphs (2) and (3), an aircraft flying within Class B, Class C, Class D or Class E airspace—

(a)

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)

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.

(2)

An aircraft shall be deemed to have complied with paragraph (1)(b) if—

(a)

the aircraft is not a helicopter and it—

(i)

flies at or below 3,000 feet above mean sea level;

(ii)

flies at a speed which, according to its airspeed indicator, is 140 knots or less; and

(iii)

remains clear of cloud, with the surface in sight and in a flight visibility of at least 5 km; or

(b)

the aircraft is a helicopter and it—

(i)

flies at or below 3,000 feet above mean sea level; and

(ii)

remains clear of cloud, with the surface in sight and in a flight visibility of at least 1,500 metres.

(3)

Nothing in this rule shall apply to a helicopter that is air-taxiing or conducting manoeuvres in accordance with rule 6(i).