alumine kasutatav kõrgus merepinnast, mis tagab vähemalt 300-meetrise (1000 jalga) kõrgusvaru kõikide objektide kohal ringi sektoris, mille raadius on 46 kilomeetrit (25 NM) ja mille keskpunktis on ra, the lowest altitude which may be used which will provide a minimum clearance of 300 m (1 000 ft) above all objects located in an area contained within a sector of a circle of 46 km (25 NM) radius cent

the altitude below which it is hazardous to fly owing to presence of high ground or other obstacles, kõrgus, millest allpool on kardetav lennata kõrgete pinnavormide või muude takistuste tõttu

a corrosive liquid acid CH4O3S that is used especially as a catalyst in chemical reactions (such as polymerization and esterification)