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Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 12:19 am

I've heard that A320-200 was first and it was developed after B747-400. Does 744 is fly-by-wire?
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RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 12:34 am

No, Im pretty sure that the 777 was the first Boeing a/c to incorporate the fly-by-wire system.
When you hear the noise of the Tartan Army Boys, we'll be coming down the road!

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 4:06 am

GKirk is correct that the 777 is Boeing's first fly-by-wire aircraft. The 747-400 has the same conventional flight control system as the earlier models.

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 5:23 am

Some might say that the L-1011 was FBW. It is but a bit different then modern FBW stuff, it does not overide what the pilot is doing like Boeing and Airbus FBW.

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 5:43 am

The boeing system DOES NOT OVERRIDE pilot's doeing! The boeing system is the first digital FBW including 3 Axes! The airbus FBW is only digital on 2 axes excluding the rudders. The boeing FBW incorporates force feedback the airbus doesn't. The airbus FBW has "hard limits" The pilot does not have THE FULL AUTHORITY! The boeing FBW has "SOFT LIMITS" The pilot has FULL AUTHORITY! These are main differences you can't doubt! (The 744 has no FBW) !

best regards, josef

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 5:45 am

Please don't start a war!!! my first comment only shows differences in construction! thank you

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 5:50 am

B-777 you are correct, with most things you have said! What I meant by overiding the system is with the 777 when you are turning over 30 degrees you have to keep force on the yoke, when the 1011 does not, it will roll from 30-60 degrees just like it did 0-30. So I probably should have written 'question what the pilot was doing'.Airbus FBW is a bit different then the Boeing, but it is my understanding that the pilot does have full authority!
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RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 6:45 am

I think the the Concorde was the first FBW airliner. Even if it compared to modern systems is a rather rude system.

I think that there is some confusion about 2-axis and 3-axis control in an earlier post.
The Airbus system has in some way a 2-axis input, but of course the output must be on all 3 axis. ´
In normal flight you control the attitude only with roll and pitch input on the sidestick. Input to the 3rd axis - gearing (or rudder) - is then automatically calculated from the roll and pitch input plus other flight parametres such as indicated airspeed and angle of attack etc.
Any input on the rudder pedals is then added to the computer generated rudder input.
That means that during normal flight you won't have to worry about your pedals - it will automatically "keep the ball in the middle".
Normally you will hardly touch the pedals until you line up for landing in crosswind. Until then you may cross your legs instead.
I don't know such detail about the 777. Incidentally there are no 777 flight crew members among my near friends.
So please tell us here if you know. If you can do it in technical terms, and not in A vs. B emotional terms, then you will be my friend...  
Best regards, Preben Norholm
Always keep your number of landings equal to your number of take-offs
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Joined: Thu Jun 08, 2000 8:34 am

RE: Is 747-400 Fly-by-wire Airplane?

Fri Nov 24, 2000 9:32 am

Fly-By-Wire is just that ...Only conction to flight control hydraulic units is electrical wires. Conventional use cables and pullies. 777 is full authuritory FBY along with the boeing C17.The 747-400 uses cable and pullies still with a fancy digital flight control set for auto-pilot and dampner sys.

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