段落大意
本段主要介绍了各种受控制的空域的各个等级,以及这些等级的区别和特点。
阅读笔记
Division of airspace:
1. Uncontrolled airspace: Class F
2. Controlled airspace:
Class E: controlled airspace 5490m, not in vicinity of airport
Class A: 5490m
Difference of E A: A IFR, pilots instrument-rated
Class D=small municipal airports
C= medium-sized metropolitan airports
B=major metropolitan airports
逻辑关系
1. 因果
Jet engines operate more efficiently at higher altitudes.
Above 5,490m is the realm of the heavy jets.
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