Dutch Roll

[BcPilot99]

I know there is a yaw damper to counter act dutch roll tendancy, but what do you do if that is inoperative?? I was taught rudder, but I have also heard to use the ailerons to counter act.

Any opinions??

 

[greedypilot]

mmm.. jailbait

wait what was your question??

 

[captmaxb74]

no rubber!!!! keep your feet off, will make it worst

 

[BcPilot99]

no rubber!!!! keep your feet off, will make it worst

SO all aileron eh,

 

[Shrek]

Let it settle on its own (trust the stability of the aircraft).........UNLESS it is a Jetstream 31.....then your altitude is too high anyways......lol.

 

[embpic1]

Let it settle on its own (trust the stability of the aircraft).........UNLESS it is a Jetstream 31.....then your altitude is too high anyways......lol.

I'm not sure, but I think that advice on a 727 will get you killed. I have been told that the 727 is a real dutch roll pig. It will get worse without corrective action.

 

[vectorvictor]

Wait is a dutch roll one of those special cigarettes you can buy on the streets of Brussells?


Adding a small amount of rudder pressure in one direction will stabilize the oscillation. Descending and increasing the effectiveness of the vertical stabilizer will also help stabilize flight. Its in Aerodynamics for Naval (Navel?) aviatiors. My understanding (and I drive a prop so take it for what its worth) is that all swept wing aircraft will have a tendency to dutch roll. The deeper the sweep, the thinner the air, and the further aft the center of pressure on the wing (ie the faster you go) the worse it gets. Its one of the reasons many aircraft have altitude and mach numbers restrictions with an inoperative autopilot. The performance window for many jets becomes very narrow at the upper altitudes of its performance envelope and dutch roll is one of the causes

 

[mamba20]

Wait is a dutch roll one of those special cigarettes you can buy on the streets of Brussells?


Adding a small amount of rudder pressure in one direction will stabilize the oscillation. Descending and increasing the effectiveness of the vertical stabilizer will also help stabilize flight. Its in Aerodynamics for Naval (Navel?) aviatiors. My understanding (and I drive a prop so take it for what its worth) is that all swept wing aircraft will have a tendency to dutch roll. The deeper the sweep, the thinner the air, and the further aft the center of pressure on the wing (ie the faster you go) the worse it gets. Its one of the reasons many aircraft have altitude and mach numbers restrictions with an inoperative autopilot. The performance window for many jets becomes very narrow at the upper altitudes of its performance envelope and dutch roll is one of the causes

Wow, fantastic answer. This is totally correct and the very reason why you will see 2 yaw dampers on most aircraft and why your not going to go anywhere if they are both inop.

 

[thesource]

But the easiest way to exit the situation is to just put the aircraft into a turn.

 

[Chest Rockwell]

Just don't eat a dutch roll before you fly. It may cause a positve test for.... oh nevermind.

 

[Shrek]

I'm not sure, but I think that advice on a 727 will get you killed. I have been told that the 727 is a real dutch roll pig. It will get worse without corrective action.

Well then.....I am glad I was talking about the 31 then huh?

Every airplane reacts different to a Dutch Roll............but if I fly a 72 I will PM ya....lol

 

[SELCAL checks]

Slow down, get down, keep your feet on the floor... and brief but aggressive aileron inputs to counteract the roll will keep your wings level.

 

[Flyer1015]

OH come on, we all know the best procedure to get out of a dutch roll, as a first officer:

1. Let go of all flight controls

2. Yell to the captain, 'YOUR CONTROLS'

3. Crawl up in a fetal position and start crying for mommy

 

[cordova1]

But the easiest way to exit the situation is to just put the aircraft into a turn.

Absolutely

 

[80for80]

At Riddle our advanced jet transport aerodynamics professor told us it the above situation ever occurs to just make sure the autopilot is engaged and that would take care of the problem.

 

[LowlyPropCapt]

At Riddle our advanced jet transport aerodynamics professor told us it the above situation ever occurs to just make sure the autopilot is engaged and that would take care of the problem.

Great... Just spit coffee on my keyboard. Thanks!

 

[vectorvictor]

At Riddle our advanced jet transport aerodynamics professor told us it the above situation ever occurs to just make sure the autopilot is engaged and that would take care of the problem.

Glad to see you got your moneys worth at Riddle.

 

[rickair7777]

Great... Just spit coffee on my keyboard. Thanks!

I just spit OJ on my keyboard.

 

[rickair7777]

The corrective action for dutch roll due to yaw-damper loss would be specific for each aircrfat type, but generally...

- Re-engage YD and AP
- If that doesn't work, keep your feet off the rudders
- Correct roll w/ short, brisk aileron inputs
- Descend out of the flight levels.

 

[L'il J.Seinfeld]

speed brakes/spoilers

 

[Edge540]

The corrective action for dutch roll due to yaw-damper loss would be specific for each aircrfat type, but generally...

- Re-engage YD and AP
- If that doesn't work, keep your feet off the rudders
- Correct roll w/ short, brisk aileron inputs
- Descend out of the flight levels.

Seconded.

Some airplanes will do it no matter what you do (the CRJ comes to mind). Talking to a CRJ test pilot, she said that the plane will wiggle all the way down until your wheels touch. To minimize it, like you said, use aileron inputs. DON'T USE RUDDER. Use adverse yaw to your advantage.

 

[Edge540]

At Riddle our advanced jet transport aerodynamics professor told us it the above situation ever occurs to just make sure the autopilot is engaged and that would take care of the problem.

I'm glad you riddle diddles are still taught stick and rudder skills....

Lord help us all...

 

[ToiletDuck]

At Riddle our advanced jet transport aerodynamics professor told us it the above situation ever occurs to just make sure the autopilot is engaged and that would take care of the problem.

See now I feel robbed for not having gone there.

 

[BYUFlyr]

The corrective action for dutch roll due to yaw-damper loss would be specific for each aircrfat type, but generally...

- Re-engage YD and AP
- If that doesn't work, keep your feet off the rudders
- Correct roll w/ short, brisk aileron inputs
- Descend out of the flight levels.

So a dutch roll only happens in the flight levels? What if you're doing single-engine low altitude maneuvers (i.e. instrument approach), can you get into a dutch roll by adding power on the good engine? Or is that just single engine aerodynamics?

 

[Swoosh!]

no rubber!!!! keep your feet off, will make it worst

Doesn't anyone see how this person wrote "no ruBBer"? I mean, seriously, we should require everyone who posts here, to have at least graduated elementary school!

 

[Hamburger]

Doesn't anyone see how this person wrote "no ruBBer"? I mean, seriously, we should require everyone who posts here, to have at least graduated elementary school!

My theory is that he was looking at the Jailbait or Edge540 Avatar while typing.

Classic Freudian Slit.

 

[Swoosh!]

My theory is that he was looking at the Jailbait or Edge540 Avatar while typing.

Classic Freudian Slit.

Ok, ok, I see, and yes, that Avatar does make one's mind wonder. I'd say a case of Hypoxia, Stagnant (or Ischemic) Hypoxia to be more exact, just a lack of blood flowing to the brain due to a 'local' restriction of the blood flow caused by a major BONER!

 

[Aviatard]

In "Fly the Wing," Webb recommends, in part, blocking the rudder, not necessarily keeping feet off. He further states that rudder input should not be used, as Dutch Roll induces some heavy stresses on the vertical fin.

He also says up front that recovery from Dutch Roll is different for every aircraft, and that he references a DC-9-30.

'Tard