However, roads and railways are not objectionable in clear zones subject to conditions that they comply with clearance standards and vehicles within azone are always in motion. Width:Width should be atleast 75.0 m on either side on the extended center line ofįig.8.5 shows a profile of the clear zbne. kngth: It should not exceed'half the length of take-off run availablg. Origin of a clearzone should be at the end of the take-off run available. As name itself indicates, the portion should be clear and no developments of any (Xpe are It is the most critical part of an approach zone from obstructions points of view. zone iS iheinflermost portion of an approach zone. Therefore, sites in accordance with the desirable pattern of developments are chosen. 15 km from edges of runways, any development exceeding a height 150m is considered as an obstruction. Beyond 4.5 km and up to 10.5 km, an increase in height of 7.5m for every 1.5 km Up to 30 m heights are permitted up to a distance of 4.5 km from locations, 60 m away from edges of runways. Following are height restriclions:įig.8.4 Approach zone profile for ILS runway Fig.8.4 shows approach zone profile of Instrumental Lanling System.(ILS) Runway. In the approach zones, developments are consider-ed objectionable, if they exceed permissible heights. Wider clearance on both sides of the runways is required in the approach zones of the airport. In this zone, aircrafts loose or gain altitudg at a very slow pace as compared to forward speed. (i) Apprgach zonez An approach zone is an area through which aircrafts approach or leaves airports.It is tlre climb out and landing path. Therefore, airport authorities enforce certain restrictions in terms of height of structures and types of land uses in airport zones. It is practically impossible for airport authorities to own such vast track of land. Therefore, it requires large clearance on both sides of climb out / lpnding Paft: This runs to about l5 km from edges of runways. During landing and take off operations, aircrafts loose or gain altitude at a very slow pace. Zoneis a defined and demarcated area, with cenain commbn qualities. (a) conical surface (b) innerhorizontal surface (c) transitional surface (d) inner transitional surface and balked (iv) Precision approach runway category II, III: (n) Precision approach runways (a) conica! surface (b) inner horizontal surface (c) approach surface (d) transition surface.
Precision approach runway category I, II, and III. Horizontal plane 150 m above the threshold elevation, qr the horizontal plane passing through the top of any object that governs an obstaile clearance altitude. The approach surface shall be horizonthl beyond a point at which 2.5% slope intersects. inner horizohtal surface approach surface and transitional surface. Highway, Railway, Airport and Harbour EngineeringĬonica\surface.