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On the sidesticks of Airbus aircraft, there is a Priority Takeover button. Wikipedia has this to say:

In typical Airbus side-stick implementations, the sticks are independent. The plane's computer either aggregates multiple inputs or a pilot can press a "priority button" to lock out inputs from the other side-stick.

On US flight 1549, the CVR transcript shows that Sully hit the Priority T/O button, after the co-pilot (Skiles) handed over control of the aircraft:

15:27:23.2 - Sully: My aircraft.

15:27:24.0 - Skiles: Your aircraft.

15:27:26.5 - FWC: Priority left.

I'm curious as to why there's a need for this button at all?

Here's a short video on YouTube, demonstrating this:

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The priority button is not normally used when taking over controls from the other pilot. Even in Airbus the control hand over is done verbally. The pilot who wants the control says, 'I have controls' and the pilot who gives the control says, 'You have controls.' Or if the flying pilot wants to give the controls to the pilot monitoring, he/ she says, 'You have controls' and the pilot monitoring confirms it by saying, 'I have controls.'

As mentioned in other answers, the priority button when pressed gives side stick control to the pilot who presses it the last. If you keep holding the button and pass 40 seconds, the other side stick deactivates. It can only be activated by pressing the priority button of the other stick. The main problem with the side stick control of Airbus aircraft is not that it is mechanically not linked. The problem is how the aircraft behaves when two inputs are given at the same time. In Airbus fly by wire, the side stick inputs are algebraically added. This means, if two pilots give an opposite and an equal demand, the aircraft may not even react to the controls. Or worse, if the two pilots were to give an identical input (in the same direction) the aircraft may overreact to the controls. Below is a picture which shows this behavior. As you can see, the left pilot gives a 20% left side stick demand, while the right pilot gives a 30% left demand. The aircraft adds up the inputs and the net input becomes a 50% left roll demand.

enter image description here

What are the risks associated with dual inputs? The main risk is that the aircraft might behave inappropriately to what the pilots want. For example, in the flare to the landing, if two pilots put in inputs to the side stick, the aircraft may under flare (opposite inputs) and the result can be a hard landing. Or if the inputs are given in the same direction (nose up), the resulting over flare may cause a tail strike. This is where the priority button becomes extremely crucial. If you for instance see the other pilot not flaring during the landing, you say I have controls, press the priority button and do the flare yourself. This ensures the other pilot can no longer control the aircraft. This is particularly important in training flights with a new pilot who for example fails to flare at the right time. Many a times new pilots tend to be nervous (natural human behavior) and even when the instructor says he has controls (after seeing what is happening), because of nervousness the trainee can unknowingly manipulate the controls. This can develop into a very dangerous situation where neither of the pilots know who has the controls. The priority button really helps in these type of dynamic situations. To ensure that the pilots are aware that there is a dual input, if the inputs meet a certain threshold, a 'dual input' aural alert comes on.

In case of Capt. Sully, we cannot be entirely sure why he pressed the priority button after saying he has controls. It might be because they were in a dire situation (dual engine flame out) and he did not want his first officer to unknowingly add any inputs to his inputs. Usually, in normal flights as said above changing over controls do not require the use of priority button.

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  • $\begingroup$ Can you explain why Air France Flight 447 pilots failed to understand that there was dual input situation when the first officer panicked? Do some other warnings override the warning about dual input? $\endgroup$ – Mikko Rantalainen Feb 6 at 14:33
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It's been several years since I worked at United's flight training center, but if my memory serves me, it is there in case the system is receiving input that the pilot wants to exclude. As was explained to me, an example of this would be the other pilot becoming incapacitated, with their body leaning against the sidestick. In this case, one would want to use the Priority Takeover button to eliminate the other pilot's input.

In Captain Sullenberger's case, it is likely that he wanted to ensure that First Officer Skiles wasn't providing any control inputs that would work against his control inputs.

Now, it is also my understanding that such functionality is not useful in a "hostile takeover" event, since the other pilot can also attempt a priority takeover (or use physical force, due to the close proximity of the two pilots).

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    $\begingroup$ The "Priority Takeover" override capability is particularly important in the Airbus control implementation because the sidesticks aren't linked: The pilots can't know if the other seat is giving a conflicting control input by feeling a force on the stick, so using the button ensures that there is no conflict: the stick with priority is the one the system is listening to. $\endgroup$ – voretaq7 Apr 18 '14 at 4:50
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    $\begingroup$ I believe the priority takeover also gives priority over autopilot, which was most likely on already. $\endgroup$ – Jan Hudec Apr 22 '14 at 22:23
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    $\begingroup$ @DannyBeckett: In that we would agree, yes (I don't know the exact procedure, just that it disconnects autopilot). And most likely here the reason to use it in case of US1549 was to make sure autopilot was disconnected. $\endgroup$ – Jan Hudec Apr 22 '14 at 22:48
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    $\begingroup$ @JanHudec, yes the button is used for both autopilot disconnect and priority takeover. Note that one merely has to tap the button to disconnect autopilot, but it must be held down for priority takeover. It is not possible to perform a priority takeover without disconnecting the autopilot first; there is no "control wheel steering" functionality on the Airbus. Additionally, autotrottle is disengaged separately via the disconnect buttons located on the throttle handles themselves. $\endgroup$ – newmanth Apr 23 '14 at 4:10
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    $\begingroup$ @JanHudec, You'd have to ask Capt Sullenberger for an authoritative answer on that :P. I do know most pilots (myself included) will not use autopilot while still being vectored out of the terminal area, since it's easier to just hand fly in this phase of flight. Many airlines have procedures to verbalize configuration changes (autopilot included) so that both pilots know the current state of the aircraft. Additionally, when the A/P is disengaged, Airbuses make a loud 'CHIRP, CHIRP, CHIRP' noise to alert the crew, which did't happen in this case, since F/O Skiles was hand flying at the time. $\endgroup$ – newmanth Apr 24 '14 at 19:48
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I'm not sure it exactly answers your question, but there is an excellent example of why this feature ought to always be used in an emergency situation.

Air France Flight 447 was an Airbus A330, I'm not entirely certain if it had this feature (I assume so?) Anyway, it went into a stall somewhere near cruise altitude and the co-pilot, for some unknown reason, kept pulling back on the right stick. Eventually the plane was at a 40 degree incline and losing altitude quickly. The pilot on the left stick noticed the the stall and tried to push the plane forward to correct, but found the controls to be unresponsive, he was apparently unaware that the right stick was pulled fully back. The plane stayed in that stall all the way until it crashed into the Atlantic Ocean.

In an emergency, it's really really important to have a single input or a "single source of truth", not matter what industry you're in (I hear it all the time in software development anyway.) I'd argue that this is the main reason they have that override switch.

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    $\begingroup$ In this particular example, the PIC did recognize the situation and told the FO to stop, but it was already too late. $\endgroup$ – Rhino Driver Nov 21 '14 at 0:03
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    $\begingroup$ Eventually, yes, the PIC came in and figured out what was going on. $\endgroup$ – Jay Carr Nov 21 '14 at 15:11
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A prime reason for this is the fact that the Airbus sidesticks are not connected mechanically, unlike the center control columns of other aircraft. In the event of conflicting inputs from both pilots, such a condition would not be readily apparent. With mechanically connected columns, conflicting input is not possible, without both pilots being aware that the other was trying to do something different.

As Jay Carr mentioned, this was one of the reasons that led to the AF447 crash - conflicting stick inputs, and apparently neither pilot was aware of that situation, as they would have been with mechanically connected columns. That was an avoidable accident, on several levels.

It's surprising that Airbus came up with dual disconnected sidesticks and didn't consider the possibility of conflicting inputs, certainly didn't do a very good job of alerting the pilots that such a condition existed. In retrospect, the computer should be screaming bloody murder at the pilots if it detects both sidesticks in use simultaneously - a situation that should never happen.

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  • $\begingroup$ AF447 flight should have shouted "dual input" all the time both pilots tried to recover the plane (or actually one pilot was frozen on panic and another tried to recover the plane). Was the "STALL" warning overriding the "dual input" warning? $\endgroup$ – Mikko Rantalainen Feb 6 at 14:37
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As far as I recall the priority button suppresses the other stick and autopilot. Since it is right under the thumb on the side-stick, that makes it quicker way to disconnect autopilot than navigating the other hand to the flight management panel.

The overall idea is that when the pilot needs to make manual input quickly they simply push that button and it will ensure that input will be obeyed, so they don't need to think what state the system was in.

Note, that the priority take-over button will disconnect autopilot immediately when pressed, but it only disables the other side-stick while held down, or permanently when held down for more than 40 seconds. The last case is primarily for situations when the other pilot is incapacitated holding their side-stick deflected or when the other side-stick fails.

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