Is there a speed limit at or above 40,000ft

Typically… it “can” fly faster though… it’s just not the most economical

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-400 series

The Boieng 747-400 usually cruise at the speed between 0.84-0.85 mach, the MMO for Boeing 747-400 is 0.92 if I remember it right.

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The 747-400 can also be flown at .86 but it normally flies at .85

The -8i flies at .86 though :)

Then you may go for Mach .85

It can fly faster and if you look at the chart Deer posted, the economical cruise speed for both the 747-400 and -8i is: Mach 0.86

I personally fly both of the 747 models (-400 & -8i) at Mach 0.86 for all my flights.

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Think I’m also having trouble with the autopilot

just depends on how much realism you’re going for. If you want to bump it up to .90, you’re on a simulator, go for it. If you want to simulate something similar to real world ops, go with .85-.86

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What kind of issue?

Just stalled and crashed the plane

Did you perhaps fly too high to early into your flight?

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Heavier flights require step climb. Fly a heavy aircraft for a short route and that is not a issue but for a longer routes where you have more fuel (also PAX and Cargo too maybe) you’ll need to step climb and not go up to FL370 right away.

Here’s a guide to step climb, just throwing it in here :)

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The issue was I accidentally dissabled the altitude on the AP and started a dive which disabled it completely. Tried to recover the plane but ended up stalling it and crashing it.:)

Oh in that case, be more careful next time so you don’t mistakenly press on something vital as the AP while cruising, descending or climbing out :)

I was about an hour into my flight and was at my cruising altitude

Ok thanks for the help though :)

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You Are Very Welcome :)

Yes I should fly at m0.85 on the 747-400 during cruise and also as a side answer should fly at lower altitudes during flights

Flight level has nothing to do with it, other than the physics of how altitude affects airspeed.

The FL400 rule to which you refer was based on ground speed, not airspeed, and was only in place due to the relatively small sizes of the old regions. It is no longer in effect. (So thankfully, everyone doesn’t climb to FL400 from KSAN-KLAX anymore, though they still fly over twice the altitude of a normal flight between these two.)

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Ok thanks for the info