阻力伞也叫减速伞，是用来减小飞机着陆时滑跑速度的伞状工具。通常由主伞、引导伞和伞袋等组成，装在飞机尾部的伞舱内。飞机着陆滑跑中，由飞行员操纵打开伞舱门，引导伞首先张开，将伞袋拉出，打开主伞，伞衣被拉出张开后可增大空气阻力，向后拖拽飞机，使之减速，缩短滑跑距离。
航天飞机轨道器设置阻力伞的目的在于增加其着陆的安全性。
The desire to increase landing safety margins for the Space Shuttle Orbiter led to decision to implement a Drag Parachute System into the Orbiter Vehicle.
为产生最大负载的制动伞所已经安装完毕：能产生9吨的阻力似乎听起来很多，但这仅仅够将重达5吨的汽车从1000英里/小时停下来。
The maximum load for the brake parachutes has been fixed: Nine tonnes of drag sounds like a lot, but it's really not much to stop a five-tonne car from 1, 000mph.
当然，当他们打开，降落伞，空气阻力剧增，他们下降的更缓慢。
Of course, then they open the parachute and then the air drag increases enormously and then they slow down even further.
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