I can’t reach more than 34.000ft with the A380

I’m currently having some issue in my flight, im flying 6300 nm with the A380 with almost full fuel and i can’t fly above 34.000 ft. If i do, stall. ¿Any idea?

3 Likes

Seems quite heavy 94% load. I guess that’s the reason

7 Likes

Extremely heavy, far out of trim (increases drag), and probably trying to climb too fast.

5 Likes

Maybe, the vertical speed is too fast

1 Like

Just don’t climb so fast up there. I’ve been able to coax a 100% load A380 up to FL370 without much issue (need like 500 FPM or less). If you really need to, just drop flaps full (not joking) and it will solve all of your issues.

Trim has no effect on fuel burn so I assume it also has no impact on drag. Just matters for disconnecting the AP on final

2 Likes

Too heavy probably. If you want to fly higher, consider step-climbing

1 Like

Hi there, at that weight, you should fly at first at 32000 or 33000 ft for an hour or two before step climbing higher. You may have a look on flight radar 24 that all aircrafts do that when really heavy.

Your %N1 is also an indication you ask too much to your engines. It should remains under 98,6%.

3 Likes

@Vitto_tucci welcome to the community!
Your screen shot looks not too bad even though your weight is high.
Is it true you experienced the problem with climbing higher by not being able to maintain forward speed (IAS kept dropping)?

I’m trying to wrap my head around this. I can see if you’re at the extremes of balance (center of lift far from center of mass) you would need more continuous control deflection which would increase drag (irl anyway). Is it true or not though that in IF, if you have AP on and your trim is not neutralized you have more drag, that is, higher throttle required? I haven’t experienced this as far as I know.

That shouldn’t be tied to weight though. Though higher weight will require higher AoA which should increase drag (though not necessarily trim).
(Oh, I only just saw already mentioned by @AndrewWu)

Yeah, the pitch here as a poxy for AoA looks like there might be a bit more room to proceed up some more, though cautiously (low VS). But getting closer to the 5 degree line I assume is getting toward the caution zone (when judged at zero climb, like here).
image

2 Likes

Yeh, i couldn’t mantein my speed for more time even the airplane was with much less weight than before. This was probably after a couple hours almost reaching my destiny. (Australia) the fuel was like at 20% and i couldn’t past over 0.80 match

However, by looking some comments (that really helped me), i did the whole flight again trying to see if i could fix the issue. And yes, now i tried to stepclimb at 500fpm and finally could get up to fl38!!

4 Likes

Btw, in theory the steps in a step climb are approximating an ideal smooth line climbing up in altitude.

The reason it continues up smoothly is because you burn off fuel weight smoothly, rather than in steps.

How would you try to follow that “step climb” smooth line?

You would just keep adjusting your climb rate to be low enough that your forward speed never deteriorates.

It’s not that I’m recommending this (ATC likes assigned altitudes etc.), it just shows that the next step up is actually the result of something like a savings account, of accumulated gradual climb “credits” you earn from the continuous fuel burn since the last step up.

2 Likes
1 Like

yeah

1 Like

i did this with a 787 going to santiago. i fully loaded it and took it up to 38,000’ and it didnt cope well. you’re extremely out of trim and way too heavy. stay at 32,000 or 34,000 (with the assumption you’re flying west so even flight level) and burn fuel before you climb any higher. heavy aircraft are not supposed to be able to sustain flight at high altitudes, wait til you’re lighter to go to 36 or 38k.

side note how does your entire aircraft weight 227,000lbs with a fuel load of 356,000lbs the math isnt mathing

Hi, do you mean this?:
image

1 million 227 thousand pounds not 227 thousand. the one looks pretty dang invisible tho-
speaking of which yea he is too heavy

Yes. You were way too heavy to climb any higher

I wasn’t flying. The following isn’t true btw, and doesn’t have an effect on the issue in any case:

So, I assume you missed the 1 in the billions place because of the space between the 100 millions digit and the billions digit (it looked like the 1 was related with the other info further to the left)?:
image

Yes I probably did. Regardless of the trim setting, you can’t climb to 40,000’ on a gross weight of 1 1/4 million pounds

1 Like