visual navaids on aerodrome-lighting systems 机场目视助航-灯光系统.ppt

Visual navaids on aerodrome (Ⅱ)-lighting systems Ⅰ General requirements Lights which may endanger the safety of aircraft may cause confusion : that non-aeronautical ground light / (shall) be extinguished, screened or modified Lights fixtures supporting structures 1) elevated lights 立式灯 frangibility (易折的) ,light-weight and low height 2) inset lights 嵌入式灯 strong enough; endurance of temperature Lights intensity 1) adequate intensity directional light 2) relative intensity: The conspicuity of a light depends on the impression received of contrast between the light and its background. 3) two relative factors of intensity: the condition of background brightness and the visibility Light control Some systems can be operated at compatible intensities: Approach lighting system RWY edge lights RWY threshold lights RWY end lights RWY centre line lights RWY touchdown zone lights Taxiway centre line lights Ⅱ Emergency lighting Using period: the primary runway in the event of failure of the normal lighting system. Color: conform to the color requirements for RWY lighting Ⅲ aerodrome beacon aerodrome identification beacon Aerodrome beacon 1) using period: at night generally 2) location: on or adjacent to the aerodrome in an area of low ambient background lighting; not shielded by objects in significant directions; not dazzle a pilot approaching to land. 3) Color and form of shining: colored flashes (at land:green;at water: yellow) alternating with white flashes or white flashes only 4)direction: at all angles of azimuth Aerodrome identification beacon 1) using period: at night 2) location: on or adjacent to the aerodrome in an area of low ambient background lighting 3)orientation: (if the aerodrome is at land) at all angles of azimuth 4) color: at a land :flashing green at wat