Simviation Forum - Airbus Glitch

Reply #15 - Nov 10^th, 2006 at 11:18am

ashaman Offline
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Are you people sure you haven't the yaw damper active on the airbus? If the YD is on and you try to move the rudder it's only normal you don't have any reaction.

Just an idea.

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Reply #16 - Nov 10^th, 2006 at 11:19am

Nexus Offline
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Quote:

Fly by wire isn't an automatic pilot. All it means is that instead of hydralics or mechanical links the surfaces are controled by electrics.

The surfaces on the Airbus are still manipulated by hydraulic motors, just as any other airliner.

But the means of transfering the control commands to the hydraulics are electrical, instead of mechanical.

Maybe that's what you meant, and then I apologize

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Reply #17 - Nov 10^th, 2006 at 3:21pm

Fr. Bill Offline
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Quote:

Fly by wire isn't an automatic pilot. All it means is that instead of hydralics or mechanical links the surfaces are controled by electrics.

True FBW can be used to limit what can be done, and it no doubt makes autopilots simpler. But it doesn't take full control of the surfaces out of the pilots hands.

Sorry, but that's simply incorrect. FBW refers to the complete system, which includes the ELAC and SEC computers, the autopilot, autothrottle, control surfaces, actuating mechanisms, and control connections.

Bill
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Reply #18 - Nov 11^th, 2006 at 7:17am

Woodlouse2002 Offline
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Quote:

The surfaces on the Airbus are still manipulated by hydraulic motors, just as any other airliner.

But the means of transfering the control commands to the hydraulics are electrical, instead of mechanical.

Maybe that's what you meant, and then I apologize

I made my statement vague enough to allow for that one. I knew the control inputs were transfered by wire but I didn't know whether the surfaces were moved by electric motors or hydraulics.

Quote:

Sorry, but that's simply incorrect. FBW refers to the complete system, which includes the ELAC and SEC computers, the autopilot, autothrottle, control surfaces, actuating mechanisms, and control connections.

Are you still maintaining that a FBW system takes control of certain surfaces completely out of the pilots hands?

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Reply #19 - Nov 11^th, 2006 at 2:10pm

Fr. Bill Offline
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Quote:

Are you still maintaining that a FBW system takes control of certain surfaces completely out of the pilots hands?

I'm not "maintaining" a thing. I rely instead on what the various manufacturers and engineers state...

With the ready availablity of plethora information and technical articles on the web, there's absolutely no reason why anyone cannot be adequately informed on any subject... Shocked

"Boeing and Airbus differ in their FBW philosophies.

In Airbus aircraft, the computer always retains ultimate control and will not permit the pilot to fly outside the normal flight envelope.

In a Boeing 777, the pilot can override the system, allowing the plane to be flown outside this envelope in emergencies. The pattern started by Airbus A320 has been continued with the Airbus family and the Boeing 777."

Might I suggest the following as a good starting place to actually learn what the Airbus implementation of FBW is?

AIRBUS FlyByWire – How it really works

http://www.apollosoftware.com/products/FlyByWire/FlyByWire_english.pdf

The Wikipedia link is also a good read:

http://en.wikipedia.org/wiki/Aircraft_flight_control_systems#Fly-by-wire

Bill
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