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19.—(1) Annex 1 (definitions for terms used in Annexes 2 to 4) is amended as follows.
(2) After point (15) insert—
“(15za) ‘ceiling’ means the height above the ground or water of the base of the lowest layer of cloud below 6000m (20000ft) covering more than half the sky;”.
(3) After point (17a) insert—
“(17b) ‘decision height’ (DH) means a specified height in a 3D instrument approach operation at which a missed approach procedure must be initiated if the required visual reference to continue the approach has not been established;”.
(4) After point (21) insert—
“(21a) ‘instrument approach operation’ means an approach and landing using instruments for navigation guidance based on an IAP and is either:
(a)a two-dimensional (2D) instrument approach operation, using lateral navigation guidance only; or
(b)a three-dimensional (3D) instrument approach operation, using both lateral and vertical navigation guidance;
(21b) ‘instrument approach procedure (IAP)’ means a series of pre-determined manoeuvres by reference to flight instruments with specified protection from obstacles from the initial approach fix or, where applicable, from the beginning of a defined arrival route to a point from which a landing can be completed and, after that, if a landing is not completed, to a position at which holding or en-route obstacle clearance criteria apply;”.
(5) In point (22)—
(a)in point (1), after “type A instrument approach operation” insert “at a visibility not less than 1000m”;
(b)in point (2), after “type B CAT I instrument approach operation” insert “with a DH not lower than 60m (200ft) and either at a visibility not less than 800m or at an RVR of not less than 550m(1)”;
(c)in point (3), after “type B CAT II instrument approach operation” insert “with a DH lower than 60m (200ft) but not lower than 30m (100ft) and an RVR of not less than 300m”;
(d)in point (4), in the second column for the entry for “precision approach runway, category III” substitute—
“a runway served by visual aids and at least one non-visual aid intended for landing operations following a type B CAT III instrument approach operation with:
(a)a DH lower than 30m (100ft);
(b)no DH and an RVR of less than 300m; or
(c)no runway visual range limitations;”.
(6) For point (25) substitute—
“(25) ‘low visibility procedures’ (LVP) means procedures applied at an aerodrome for the purpose of ensuring safety during low-visibility operations;”.
(7) For point (26) substitute—
“(26) ‘low visibility take-off’ (LVTO) means a take-off operation with an RVR less than 550m;”.
(8) Omit point (27).
(9) Omit point (35).
(10) After point (37) insert—
“(37a) ‘required visual reference’ means that section of the visual aids or of the approach area which should have been in view for sufficient time for the pilot to have made an assessment of the aircraft position and rate of change of position, in relation to the desired flight path. In Category III operations with a DH, the required visual reference is that specified for the particular procedure and operation;”.
(11) In point (47b)3.—
(a)for the entry in the first column “Category IIIA (CAT IIIA)” substitute “Category III (CAT III)”;
(b)for the entry in the second column substitute—
“(a)a DH lower than 30m (100ft);
(b)no DH and an RVR of less than 300m; or
(c)no runway visual range limitations;”.
(12) Omit point (47b)4.
(13) Omit point (47b)5.
By convention in aviation operations altitude is measured in imperial units (feet) and distance is measured in metric units (metres).
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