Aom tells very instrument pilot under what visibility ( in terms of runway visual range ( rvr ) ) and or cloud ceiling can the aircraft take off , and under what visibility ( again in terms of rvr ) and visual reference can the aircraft continue the approach to land from the decision altitude ( for precision approaches , e . g . instrument landing system ( ils ) ) or from the minimum descent altitude ( for non - precision approaches ) . there are a number of factors affecting the values of aom 機(jī)場(chǎng)最低飛行條件讓每名按儀表駕駛的飛行員知道,航空器在什么能見(jiàn)度以跑道能見(jiàn)距離來(lái)說(shuō)及或云幕高度下才可起飛;以及航空器在什么能見(jiàn)度以跑道能見(jiàn)距離來(lái)說(shuō)及目視基準(zhǔn)下,才可從決斷高度用于如使用儀表著陸系統(tǒng)的精確進(jìn)場(chǎng)或最低下降高度用于非精確進(jìn)場(chǎng)繼續(xù)進(jìn)場(chǎng)著陸。