is there a thread you could direct me to to work out best fuel and weight settings? i just make sure im within the MTOW and MLW usually as long as i have enough fuel for the distance im travelling.
do spoilers stay on flight for the whole time? i usually turn spoilers on when i want to reduce speed, then when ive reached that lower speed and the ‘spoilers on’ appears i will set the spoilers to armed
No, unless necessary, they don’t have to be out.
so would you set them to off or armed after you’ve reached the lower speed?
i assumed armed meant they were off but will automatically deploy on touchdown
You would set them to off, but if you’re on final, you would set them to armed.
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I had this problem with the EXACT same plane last night on a trans-pacific flight…
I wasn’t climbing though, I was in cruise at 35000 feet, aircraft was completely clean…
The wind was at 52 kts, a direct tailwind
Autopilot was oscillating between 800 to -800 fpm trying to maintain FL350
I thought it was gonna exceed AP limit, go into manual while I wasn’t looking and crash, but it didn’t
Very annoying though. I’m glad to see it wasn’t just me that experienced this.
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Flaps should only be out during takeoff and landing.
For takeoff, use 10 to 15 degrees or 1 to 1+F.
For landing, gradually increase from 0 to 30 or F. You should have full flaps out by the time you are at 010 (1,000 feet) AGL.
Spoilers are set to Armed during approach.
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i think it may be something to do with weight but im not too sure. usually the problem i get in cruise is the nose will be pitched up and it looks pretty horrendous. ive hardly ever been over MLW at any point during a flight either.
How much fuel do you think you had on board during that time?
I had around 54% fuel
Why do you have flaps out at 9,000 ft tho?
deployed them to try keep the plane level but it didn’t help
i don’t find im particularly overweight at the time to be honest, not sure what the problem is. sometimes using flaps helps me level the plane out but its not a very realistic thing to do at 30,000ft +
anybody know of a thread advising on how to configure fuel and weight? or how do you guys do the maths?
Try looking here.
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cheers buddy appreciate it
No problem.
As far as I’m concerned Schyllberg is aware of this issue. I think I saw him on a different thread with a similar topic addressing this issue where he tried to reproduce this issues along with Damian and one of them had their 777 going up and down.
Other than that, from personal view, I who fly a lot of long hauls, and very often the 777-300ER, have noticed this issue only a very few select times. It’s a rare one for me but I’ve faced it before.
Ultimately from what I know after conducting some tests with the 777 is that the plane does this irregular movement of going up and down by hundreds of feet per minut during cruise with A/P on when, the plane is too heavy and too slow for that altitude. If you are too heavy and all that, it’ll contribute to having the plane go up and down but not by much as the issue seems to lie elsewhere. Even when your plane is light weight and you’re at let’s FL330 and at Mach 0.84, the plane could still move up and down radically.
What I usually do is to keep an eye out for the flight for a little while, 10mins or so, when I see that it’s stable although moving up and down but I know that it won’t stall and fall then I leave my device unattended and let the plane fly, which it does without and hiccups.
Bassically everyone has this issue happening for them, and some more than others, and I’m one of those who find me in a situation we’re this problem is persistent in 1 out of every 100-200 B777-300ER flights, so it’s very rare for me to encounter this.
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i see. what process do you go through when configuring fuel and weight? and does the amount of fuel impact on the number of passengers and cargo you can then carry?
I calculate the fuel so that I have approximately 2-3hrs of it left by the time I’m supposed to land, that is due to strong head winds that could cause me to use more fuel than needed or if I need to divert or being held up in the air for a while due to heavy inbound traffic.
The amount of fuel you load your plane with will add on to the overall weight of the plane. And you would not like to go above MTOW, try to stay under that. But I on 12+ hours flights carry fuel worth up to 14hrs and have passengers according to how many that specific airline accommodates. So that could sometime be 220 or 250 or 300, why not 400?
And then Cargo, in Kilograms, I pack quite a lot but once again depends on how many passengers, and what route I’m flying since I tend to keep things realistic to max, I load with as much Cargo that route usually carries over or a rough estimate of what I think is the amount of cargo being transferred on that route but a typical cargo weight for me on the B777 flight with China Airlines from Taipei to Frankfurt would be about 6000-6500KG in the front and 4500-5500KG in the back.
And I’m always able to keep it well below MTOW even for a 14hr flight like Taipei to Frankfurt.
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