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Luftkutscher
3 years ago

That’s different. A small aircraft, which has had a height of 1,000 metres above ground throughout the entire trip, will also have this height 20 kilometres before the runway, unless the airspaces and air traffic control require something else.

Airliner, which usually have a flight altitude of about 10,000 meters on the travel flight, already begins with the sinking flight over 100 kilometers before the runway. The glide angle of the instrument flight systems is usually around 3 degrees, so that you can calculate the height that means 20 kilometers, namely about 1000 meters

FelixA388
3 years ago

Hello,

Since I live in a 35-kilometre flight from a larger airport, I can tell you that pretty well. 20 kilometers before the touch-down they have a height of about 1000 meters.

If the sinking flight cannot be carried out constant because, for example, mountains are in the way, then the aircraft 20 km before the runway can be much higher. The London City Airport is an example of a non-constant approach. Instead of “normal 3° you need 5.5° steep approach here.

For example, if you cannot fall below 1500 meters because of mountains, the approach also changes, and so it depends on airport to airport how high the plane is 20 kilometers before the Lamde threshold.

It is completely unpredictable for small machines, some of them do not reach 1500 meters above sea level, and 20 kilometers before landing are not always in the landing approach.

Greetings

Luftkutscher
3 years ago
Reply to  FelixA388

Which small aircraft do not reach a height of 1,500 meters?

FelixA388
3 years ago
Reply to  Luftkutscher

Do you have to climb to 1500 meters?

FelixA388
3 years ago

Yeah, sure, but it’s coming.

Luftkutscher
3 years ago

Not always, but more height gives more security. In addition, the flight at larger altitudes is usually more quiet than at lower altitudes and when flying according to instrument rules, a minimum amplitude must be maintained, which is usually above 1,500 meters

sebastianla
3 years ago

The normal slide path (there are a few airports with steeper arrivals) has a slope of 3°.

My calculator says 20 * tan(3°) = 1.04

So the planes are still good one kilometre high.

Nube4618
3 years ago

At a speed of 300 km/h horizontal and -7 m/s sinking speed there is a height of about 2 km. When approaching land with an app like e.g. Flight radar follows, this value is roughly confirmed.

Nube4618
3 years ago
Reply to  Nube4618

Having followed an approach Barcelona-> Zürich, the height was 20 km before the finish 1890 m above sea. Zurich is 445 m above sea, so the height above ground 1445m was 20 km before landing 😎

StarfleetCenter
3 years ago

1500 to 4000 meters.

https://de.m.wikipedia.org/wiki/country approach

peterobm
3 years ago
M1lfreicherNico
2 years ago

Ju says, “Naja it always depends when they have the transition route they are on 6000 feet, otherwise they are at 12000 feet.” Tbh, I don’t know what he’s saying, but the man’s right.