Simviation Forums

So here is one that needs an answer.

I have just flown from the UK to Germany, on a  Boeing 737-700.  The aircraft was fitted with AirTrack. It is a combined inflight entertainment and a moving map display. The usual stuff, hight, speed, outside temp, distance to destination etc. I was watching it when I noticed that our speed was 332 mph and our hight was 6300 feet, well below our 10,000 limit. 332 mph translates to 288.49 kts, well above the limit of 250 kts. Now before we all jump in here, read on...... Looking out of the window, it was very clear to see that we where infact below 10,000 feet. As far as the indicated speed on the screens, they are a repeater from the Air Data Reference Computer that the pilot gets his own information from (I know, I work on them)
Anyone shed any light on this speed-hight question?

Matt

This is an artificial FS imposed limit that may or may not legally apply in the US - I don't know. Have you ever heard of Bravo airspace in the UK? Nope, but in FS it's all over the world.

Listen into London Control IRL and you'll hear AT controllers saying to pilots things like 'please expedite your turn to 320' or 'please expedite your descent to 8000' usually because of the volume of traffic. They mean get a bl**dy move on and they ain't measuring your airspeed that's for sure  ;)

Need someone with more recent RL IF experience than me to get the latest picture though.

Hmm...I know in the US the controllers DONT have the ability to lift the 250 <10.000' limit, but like always there are probably some exceptions....

But did it ever occured that those numbers were the actual groundspeed? With a strong tailwind, that scenario is very possible!  :)
Since groundspeed also comes from the ADC.

And dont you have Class B airpsace in the UK?

Full 747 climbs at 280 minimum.

unless you can't do 250, go over it, any other case: do 250 or get angry FAA call

Full 747 climbs at 280 minimum.

unless you can't do 250, go over it, any other case: do 250 or get angry FAA call

Yeah, the 747's are ALMOST always granted faster CLBs simply because their VNAV (and hence most economic) will always command a speed >250kts.Fully loaded VNAV will likely have you going at some 300kts below 10.000'!  :)

...always exceptions  ;)