机尾擦地为飞机降落至机场跑道或是从机场跑道起飞时，由于仰角过高导致机尾摩擦地面，部份飞机会在机尾加装保险杆，防止机尾擦地对机体结构造成伤害与伤害到机场跑道

In aviation, a tailstrike is an event in which the rear empennage of an aircraft strikes the runway. This can happen during takeoff of a fixed-wing aircraft if the pilot pulls up too rapidly, leading to the rear end of the fuselage touching the runway. It can also occur during landing if the pilot raises the nose too aggressively. This is often the result of an attempt to land nearer to the runway threshold.