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-   -   777 fly by wire? (https://www.pprune.org/tech-log/393945-777-fly-wire.html)

Loose rivets 18th November 2009 03:34

A bevy of brave people tried a full manual reversion landing in a new BAC1-11. It was almost catastrophic.

Both levers pulled and nearing the concrete, when it became apparent that the world was getting bigger at an inappropriate rate. PF pulled. PNF came into the loop and pulled as well. There were footrests to brace oneself against for extra pulshon.

Great result. They ended up with a dial full of blue.

Then of course the pushing contest began, but at about this time, someone with a modicum, flicked the tiny silver switch on the centre pedestal. This, if I remember correctly, gave an equivalent feel of 180kts. No doubt at that moment, there was a call to stop pushing.:}

Thems were fun days - days when pilots were issued with a lot of luck as part of their licensees.

hawk37 18th November 2009 23:56

737Forever asked in the first post:

"How does the fly by wire system on the 777 work in a crosswind? Can you sideslip with cross control like a conventional aircraft or does a aileron input on the yoke just command a given roll rate.so that you have to neutrelaze the yoke once the give bank angle is achived?"

Zlin77 replied in post 2

"Flies just like a normal aircraft with crossed controls, control inputs must be maintained to displace the flight control surfaces...."

I was hoping for a clear answer (don't fly A's nor B's). Do you have to neutralize the yoke once the given bank angle is achieved, as 737forever asks?
And..when zlin77 says control inputs must be maintained to displace the flight control surfaces...is this correct? and are the ailerons in fact displaced once the desired wing down bank angle is achieved?

kijangnim 19th November 2009 00:56

GREETINGS
B777 is flown like any conventional aircraft, no specials when it comes to cross-wind, cross control, side slip, whatever you feel comfortable with. :ok:
Airbus is different story (Roll Rate):}

hawk37 19th November 2009 10:48

So...Kijangnim, or others...

1. Do you have to "neutralize" the yoke once bank angle is achieved in a wing down landing?

2. Will the 777 maintain the (or re acquire the same) bank angle in a gust if the ailerons are kept neutral?

3. Is it true that "control inputs must be maintained to displace the flight control surfaces" in a wing down landing?

I'm trying to use the same context (and words) of posters 1 and 2, (Zlin and 737forever) in order to understand the answers.

ratarsedagain 19th November 2009 11:21


Max hand flown demonstarted xwind on the 777 is 38 kts
:confused::confused::confused:
It's 40kts for landing dry or wet on our 777's.

FullWings 19th November 2009 11:22


1. Do you have to "neutralize" the yoke once bank angle is achieved in a wing down landing?
No, unless you want the wing to rise up again due to the secondary effect effect of the rudder you're using to line up with the runway.


2. Will the 777 maintain the (or re acquire the same) bank angle in a gust if the ailerons are kept neutral?
No, unless the gust takes you outside the roll envelope (c.35deg) in which case it will return to 30deg.


3. Is it true that "control inputs must be maintained to displace the flight control surfaces" in a wing down landing?
Yes, if you're doing it properly!

The aileron/flaperon displacement is proportional to control wheel deflection. There is a "gust suppression" function which can command yaw and/or roll but it's for ride comfort and is transparent to the pilot.


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