下滑信标的有效导航距离为（）NM。

The hijacker wants a car waiting on the runway, he will keep two passengers as （ ） .

“Glide slope” of an ILS can provide the aircraft a （ ） indication.

The localizer of an ILS can provide the （ ） of an aircraft to the runway.

When an aircraft cannot put gears down, it will need （ ） .

“Belly landing “means （ ） .

“Engine partially disintegrated” means the engine （ ） .

The maximum width of an air route is 20km and the minimum width is （ ） km.

The main purpose for extending the flaps is to （ ）.

（ ） carpet may be required for emergency landing.

（ ） is responsible for the use and management of SSR codes.