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The Air Navigation (Overseas Territories) Order 2001

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Quadrantal rule and semi-circular rule

30.—(1) Subject to paragraph (2), in order to comply with the Instrument Flight Rules, an aircraft when in level flight above 3,000 feet above mean sea level or above the appropriate transition altitude, whichever is the higher, shall be flown at a level appropriate to its magnetic track, in accordance with the appropriate Table set forth in this rule. The level of flight shall be measured by an altimeter set:

(a)in the case of a flight over the Territory, to a pressure setting of 1013.2 hectopascals; or

(b)in the case of any other flight, according to the system published by the competent authority in relation to the area over which the aircraft is flying.

(2) An aircraft may be flown at a level other than the level required by paragraph (1) if it is flying in conformity with instructions given by an air traffic control unit or in accordance with notified en-route holding patterns or in accordance with holding procedures notified in relation to an aerodrome.

(3) For the purposes of this rule “transition altitude” means the altitude so notified in relation to flight over such area or areas as may be notified.

Table I—Flights at levels below 24,000 feet
Magnetic trackCruising level
Less than 90°Odd thousands of feet
90° but less than 180°Odd thousands of feet + 500 feet
180° but less than 270°Even thousands of feet
270° but less than 360°Even thousands of feet + 500 feet
Table II—Flights at levels above 24,500 feet
Magnetic trackCruising level
Less than 180°25,000 feet

27,000 feet

29,000 feet or higher levels at intervals of 4,000 feet

180° but less than 360°26,000 feet

28,000 feet

31,000 feet or higher levels at intervals of 4,000 feet

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