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I. LOW VISIBILITY PROCEDURES:
1. DEFINITIONS AND ABBREVIATIONS:
1.1 Precision approach and landing operations: An instrument approach procedure based on navigation systems (ILS, MLS, GLS and SBAS CAT I) designed for 3D instrument approach operations Type A or B.
1.2 ILS Category I (CAT I) Operations: A decision height not lower than 60 m (200 ft) and with either a visibility not less than 800 m or a runway visual range not less than 550 m.
1.3 ILS Category II (CAT II) Operations: A decision height lower than 60 m (200 ft), but not lower than 30 m (100 ft) and a runway visual range not less than 300 m.
1.4 ILS Category III Operations:
1.4.1 CAT IIIA Operations: A precision instrument approach and landing with -
i. a decision height lower than 30 m (100 ft) or no decision height; and
ii. a runway visual range not less than 175 m.
1.4.2 CAT IIIB Operations: A precision instrument approach and landing with -
i. a decision height lower than 15 m (50 ft) or no decision height; and
ii. a runway visual range less than 175 m but not less than 50 m.
1.5 Decision Altitude/Height (DA/H): A specified altitude or height in a 3D instrument approach operation at which a missed approach must be initiated if the required visual reference to continue the approach has not been established.
1.6 ILS Critical Area: An area of defined dimensions about the localizer and glide path antennas where vehicles, including aircraft, are excluded during all ILS operations. The critical area is protected because the presence of vehicles and/or aircraft inside its boundaries will cause unacceptable disturbance to the ILS signal-in-space.
1.7 ILS Sensitive Area: An area extending beyond the critical area where the parking and/or movement of vehicles, including aircraft, is controlled to prevent the possibility of unacceptable interference to the ILS signal during ILS operations. The sensitive area is protected to provide protection against interference caused by large moving objects outside the critical area but still normally within the airfield boundary.
1.8 Low Visibility Procedures: Specific procedures applied at an aerodrome for the purpose of ensuring safe operations during Categories II and III approaches and/or low visibility take-offs.
1.9 Low Visibility Take-Off: A term used in relation to flight operations referring to a take-off on a runway where the RVR is less than 400 m.
1.10 Obstacle Free Zone (OFZ): The airspace above the inner approach surface, inner transitional surfaces, and balked landing surface and that portion of the strip bounded by these surfaces, which is not penetrated by any fixed obstacle other than a low-mass and frangibly mounted one required for air navigation purposes.
1.11 Runway Visual Range (RVR): The range over which the pilot of an aircraft on the centreline of a runway can see the runway surface markings or the lights delineating the runway or identifying its centreline.
1.12 Safeguarding Procedures (SP): Safeguarding Procedures (SP) are instructions for relevant airport departments and airside operators to prepare ground services and facilities for low visibility operations, in order that when LVP are implemented all Safeguarding procedures are complete and airport is configured for CAT II/CATIIIA/CAT IIIB Operations and Low Visibility Take-Offs.
1.13 Aerodrome Operating Minima: The limits of usability of an aerodrome for -
a. take-off, expressed in terms of runway visual range and/or visibility and, if necessary, cloud conditions;
b. landing in 2D instrument approach operations, expressed in terms of visibility and/or runway visual range; minimum descent altitude/height (MDA/H) and, if necessary, cloud conditions; and
c. landing in 3D instrument approach operations, expressed in terms of visibility and/or runway visual range and decision altitude/height(DA/H) appropriate to the type and/or category of the operation.
1.14 Touchdown Zone- The portion of a runway, beyond the threshold, where it is intended landing aeroplanes first contact the runway.
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