飞行高度层
- 网络Flight Level;FL Flight level
飞行高度层-
总垂直误差（TVE）：航空器实际飞行的气压高度和指定的气压高度（飞行高度层）之间的垂直几何差值。
Total Vertical Error ( TVE ): Vertical geometric difference between barometric altitude in actual flight of aircraft and designated barometric altitude ( flight level ) .
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一直以来，许多业内管理人士及飞行员都认为中国在飞行高度层垂直间隔上的规定过于谨慎，甚至可以说是守旧。
Many industry officials and analysts have long felt that China 's extra vertical-airspace buffer has been so cautious as to be antiquated .