11 replies to this topic

[gvgch]

I was recently flying a 737-800 at 32,000 feet. I managed to climb to 32,000 feet but my auto throttle is unable to maintain mach .78. I had to manually place it at mach .78 but when I switch it to A/T, the speed decreases. 4http://i.imgur.com/5zDPaUc.png

[TJ/TeeJay]

I had this problem a few weeks ago as well while flying on VATSIM, I solved the problem by turning off default weather on my pilot client. (FSInn)

[Kirkland]

Uh see if it works at a lower altitude.

My theory is that the A/T isn't supposed to use max throttle and it's impossible to maintain that speed without it?

I'm not sure.

[gvgch]

But it isn't max throttle. I did use Vatsim for 30 minutes before disconnecting myself. I will try to do a flight without Vatsim to see if it works

[Syllei'Anor]

are you seriously trying to fly at 516 knots?

[Chubby Bear]

.78 Mach (SI Standard) = 447.34 knots = 827.84 kilometers per hour.  ( oh how I just love technical terms )

Fits right into Boeings Technical specs for the average cruising speed of a 737-800 at 30 000 feet

Must be a technical glitch of some kind.

[Chubby Bear]

516knots = 0.89 Mach (SI Standard) = 955.k km/h

To high for a cruising speed of a 737

[TJ/TeeJay]

516knots = 0.89 Mach (SI Standard) = 955.k km/h

To high for a cruising speed of a 737

Unless you got tailwind.

[Chubby Bear]

Would a tailwind push you from 0.78 Mach to 0.89 or close or over that amount?

That's a lot of extra km/h , I never realized it could push an aircraft that much faster.

[gvgch]

I will do my vatsim less flight tomorrow. In my case, There was no tailwind. Tailwind would have helped

[mxax-ai]

Would a tailwind push you from 0.78 Mach to 0.89 or close or over that amount?
That's a lot of extra km/h , I never realized it could push an aircraft that much faster.

It is rare, however the difference is about 170 km/h, which has been recorded in earths atmosphere. Jetstream sometimes gets that fast. A couple of years ago there were really strong winds over western Europe, leading to props flying at jet speeds and vice versa, depending on the direction.

[Syllei'Anor]

no, a tail wind would not do that much, i must have been looking at an incorrect conversion chart but to get 447knots in a 737 you would be pushing it a bit anyway assuming it uses realistic flight data and controls.