Questions tagged [fly-by-wire]

A technology which moves control surfaces by processing pilot input via software.

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29
votes
6answers
5k views

Why aren't there simplified fly-by-wire helicopter controls?

I was discussing helicopter control with relatives over the holidays, particularly regarding how difficult it is to fly one and how changing any control requires adjusting the other two main controls. ...
12
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1answer
3k views

What are the “channels” on the A320 Rudder Travel Limit Unit?

The KNKT's final report on last year's Air Indonesia QZ-8501 crash repeatedly mentions that the faulty solder joint on the Flight Augmentation Computer (FAC) caused an open circuit on "both channel A ...
6
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4answers
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What is fly-by-wire?

What exactly does the term "fly-by-wire" mean? Where did it originate? I understand that it refers to control systems. If an aircraft is not fly-by-wire, what is it? That is, what are the alternatives?...
22
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2answers
10k views

How are fly-by-wire airliners controlled in case of complete electrical failure?

In this comment, it is postulated that even fly-by-wire aircraft (Airbus) are demonstrated to fly without any electrical systems. All Airbus aircraft are demonstrated controllable with complete ...
5
votes
1answer
1k views

Does the 787 gust alleviation system make a more comfortable ride or for a more stable aircraft?

The 787 active gust alleviation system, similar to the system used on the B-2 bomber, improves ride quality during turbulence. Ride quality in a B2 bomber means a more stable weapons platform. Ride ...
4
votes
1answer
6k views

How does auto-trim work on fly-by-wire aircraft?

As I understand, you trim to reduce the effort needed to maintain the stick in the right position. Thus, you may reach steady flight before moving the trimming wheel. In fly-by-wire aircraft (to fix ...
6
votes
3answers
2k views

Are NATO fly-by-wire fighters designed to feel like F-14 Tomcats?

Related question: Do fly-by-wire flight controls in airliners provide artificial feel? Icefire, by Judith and Garfield Reeves-Stevens, contains the following passage: When the engineers develop a ...
22
votes
1answer
9k views

How does the Airbus flight computer's voting system work?

From what I've read about Airbus planes is that their fly-by-wire system works by having three different flight control computers calculate what the plane should be doing and then vote on all the ...
9
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5answers
3k views

Can light GA aircraft implement fly-by-wire technology?

Theoretically, I know it is possible. I know the benefits of fly-by-wire too. My question(s) most revolve around: why it hasn't been done? What challenges1 would there be? What benefits are there by ...
22
votes
3answers
3k views

Could fly-by-wire protect against a takeoff tail strike?

If the takeoff weight is underestimated, rotation will be done too early and may result in a case of tail strike. One example of such mistake is a 747-400 (F-HLOV) in 2006 (case 8 in this study). The ...
2
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3answers
6k views

What would happen to the rudder on an A320 if both FAC systems failed?

What would happen to the rudder of an A320 if both Flight Augmentation Computer (FAC) systems completely failed during mid-flight? Would the auto pilot immediately pass control back to the pilots or ...
35
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14answers
12k views

Why do passenger jets accept input that will cause the aircraft to perform dangerous maneuvers it was not designed for?

Examples: A bank angle > 45 degrees is considered an “upset,” putting the plane in a position that can lead to a loss of control. A pitch > 20 degrees can possibly be dangerous and cause the ...
13
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1answer
1k views

Is the A380 ailerons' kinematic modified in alternate law?

I was looking at a video of a A380 display that led me to the "valse des ailerons". This strange ailerons behaviour is available in normal law, but what happen when some fly-by-wire features are not ...
9
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2answers
565 views

Have there been any studies on which fly-by-wire pilot interface is preferred; rate control or direct control?

Provided an aircraft with a fly-by-wire system, there are basically two possible choices when it comes deciding how to let the pilots interface with it: rate control / attitude hold: a deflection of ...
13
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3answers
5k views

Do fly-by-wire flight controls in airliners provide artificial feel?

Mechanical and hydro-mechanical flight control systems (cables, pushrods, hydraulics) all offer pilots some form of feedback – direct or, in the case of hydraulics, artificial – as the aircraft ...