Dutch Roll

[cstorey]

There is a terrifying video shown on a pprune thread dealing with the recent TU154 disaster . The spectacular bits are from about 3:00 onwards intitally , and more frighteningly from about 7:00 on when the situation looks to be well-nigh uncontrollable . It is unclear what caused the Dutch roll, which involved yaw which looks to be about 40 Degrees each side of the straight ahead position, and coupled roll of perhaps 25 degrees in each direction . I should be interested to hear from Peter Mcleland whether he ever encountered anything like this on the Trident ( I don't recall if it was a Dutch roller ) and also from our 2 or 3 VC10 pilots ( which was a Dutch roller )

https://www.youtube.com/watch?feature=p ... yfzs#t=511

[DaveB]

Mine got.. that was horrible

ATB
DaveB

[Nigel H-J]

Oh my God They were literally fighting for their lives!!

That was superb airmanship in the most difficult of circumstances, they all deserve a medal for getting the aircraft down safely.

Nigel.

[Motormouse]

If Im looking at same clip as you, looks like deliberately induced, as it was in a roll / yaw couple from take off.
Most swept wing types will do that, its why yaw damper is necessary.
Ttfn
Pete

[Hot_Charlie]

Agree with Motormouse, particularly at the low level. They should have been able to stop any "real" Dutch roll at a far earlier stage using a fairly basic technique.

It'll be interesting to compare my current type with its contemporary!

[ChrisHunt]

Deliberate or control failure? I noticed the early onset and immediately thought of a failure of some description or other.

[Hot_Charlie]

Deliberate or control failure? I noticed the early onset and immediately thought of a failure of some description or other.

First time I saw it the video started half way through! Looking from the take off they appear to enter what looks like a PIO (pilot induced oscillation) in roll. Again, if they haven't been taught the correct techniques, or don't know how to use them, then it could quickly go Pete Tong leading to the massive oscillations in roll and pitch seen later. Possibly exacerbated by a technical failure and the anhedral wing perhaps.

[petermcleland]

There is a terrifying video shown on a pprune thread dealing with the recent TU154 disaster . The spectacular bits are from about 3:00 onwards intitally , and more frighteningly from about 7:00 on when the situation looks to be well-nigh uncontrollable . It is unclear what caused the Dutch roll, which involved yaw which looks to be about 40 Degrees each side of the straight ahead position, and coupled roll of perhaps 25 degrees in each direction . I should be interested to hear from Peter Mcleland whether he ever encountered anything like this on the Trident ( I don't recall if it was a Dutch roller ) and also from our 2 or 3 VC10 pilots ( which was a Dutch roller )

https://www.youtube.com/watch?feature=p ... yfzs#t=511

Chris, I don't remember having any trouble with the Trident and Dutch Roll...On the rare occasion when I noticed it, I was a bit slower that I should have been on the Approach...Getting the correct speed back and just being gentle with the controls seemed to make it go away.

I remember when I was learning to fly the Anson 19 that I got something that looked like Dutch Roll...I was flying with the Boss and he just said to me " Mac, just take your hands off the controls!"...I did as he said and the "Dutch Rolling" instantly stopped. It was nothing to do with Dutch Roll...It was simply me over controlling. That demonstration just stopped me doing it again...I sometimes do it in Flight Simulator when I'm trying to line up with the centre line of the runway after a rather late finals turn...I over control and swing from side to side of the centre line. Remembering the old Anson makes me realise that it is just me doing it and I make an effort to handle the stick more gently...Always works!

[Nigel H-J]

Just found out about this searching PPrune site:

Scroll down to the 12th post by Rogatol then further down to 15th post by Capetonian as I don't think it would be right to copy and paste their comments but to put it in a nutshell there had been a major system failure of the aircraft.

http://www.pprune.org/safety-crm-qa-eme ... 232-6.html

A brief report of this from the BBC News:
http://www.bbc.co.uk/news/world-europe-13286479

Regards
Nigel.