AirbusBoeing
Posts: 52
Joined: Thu Apr 28, 2005 2:14 am

Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 11:28 am

Just curious...while doing a extreme crosswind landing we see the plane aligned at an angle with the runway. What about its wheels at that moment. Do they have the capability to align parallel to the runway. If not, then at the moment of touchdown, don't the misaligned wheels pull the aircraft off the runway and isnt the main landing gear then dragged at an angle on the runway for a few seconds until the aircraft aligns straight.
 
EMBQA
Posts: 7795
Joined: Sat Oct 25, 2003 3:52 am

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 11:38 am

Quoting Airbusboeing (Thread starter):
Do they have the capability to align parallel to the runway.

No. The only aircraft that can do that is the B-52.
"It's not the size of the dog in the fight, but the size of the fight in the dog"
 
NAV20
Posts: 8453
Joined: Thu Nov 27, 2003 3:25 pm

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 11:52 am

I can only speak about light aircraft - but the answer with those is that, just before touchdown, you apply a touch of rudder to counter the drift and straighten out as far as possible.

Sometimes (in my case, about twice in a lifetime so far  Smile), even in a stiff crosswind, you get the timing exactly right - with the aeroplane flying exactly straight and exactly level at the moment of touchdown. Most times though, yes, the tyres do have to take the strain by skidding a little.
"Once you have flown, you will walk the earth with your eyes turned skywards.." - Leonardo da Vinci
 
AA717driver
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Joined: Tue Feb 12, 2002 8:27 am

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 12:48 pm

Use rudder to center the longitudinal axis of the plane (difficult in an MD80) and wing down into the wind to stop drift. There should be no skidding of the mains. (Nav20--It will come. Just have patience and work hard! Big grin )

I'd rather land in a crosswind by far rather than a head wind or calm. Maybe it just makes me concentrate that much more. Dunno.  Wink TC
FL450, M.85
 
NAV20
Posts: 8453
Joined: Thu Nov 27, 2003 3:25 pm

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 1:03 pm

Quoting AA717driver (Reply 3):
Nav20--It will come. Just have patience and work hard!

Cheers, AA717driver! Actually I was exaggerating, my crosswind landings weren't bad, 'crossed controls' and all (can't fly any more, eye injury).

Hesitated to mention 'wing down', though, partly because it would have over-complicated my answer, and partly because another airline pilot who gets on A.net told me that it's discouraged nowadays because of the risk of engine-strike?

[Edited 2006-03-31 05:07:59]
"Once you have flown, you will walk the earth with your eyes turned skywards.." - Leonardo da Vinci
 
ILCFII
Posts: 39
Joined: Sat Feb 11, 2006 12:31 am

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 2:46 pm

There are a few ways to properly do a x-wind landing.

The way I prefer it to land in what is called a side slip. Basically, the pilot lowers the wing into the direction of the wind and uses the opposite rudder control to align the logitudinal axis of the aircraft with the runway centerline. As the airplane approaches the runway, the upwind main gears will touch down first, followed by the downwind main landing gear. As soon as this occurs the pilots should neutralize the rudders so that the nose gear is alligned with the runway when the nose wheels touch down.

The second option is to approach the runway in a crab. The pilot basically lowers the wing into the upwind direction and maintains a constant ground track towards the runway. Just prior to touchdown the pilot will level the wings and use rudder to align the logitudinal axis with the runway.

I know for the purposes of teaching pilots, I prefer the side slip. The side slip allows the pilot to put their correction in early on during the final approach. There is much less to do when you are close to landing unlike the crab where you are manuevering immediately prior to touchdown. I guess I am not sure what airline pilots do? Any care to comment?

The bottom line is that a x-wind landing has many factors that determine how smooth it will be. In my mind, any safe landing is a good landing.

ILCFII
 
Mir
Posts: 19092
Joined: Mon Jan 05, 2004 3:55 am

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 5:19 pm

Quoting NAV20 (Reply 4):
Hesitated to mention 'wing down', though, partly because it would have over-complicated my answer, and partly because another airline pilot who gets on A.net told me that it's discouraged nowadays because of the risk of engine-strike?

I'd imagine it would be discouraged in airliners with engines hanging under the wings, but I think you'll find the wing-low method (also known as the side slip, which ILCFII described in more detail above) used extensively in general aviation.

I've seen some bizjets fly their approaches in a crab, then switch to a slight side slip just before touchdown, with one main hitting the runway before the other.

-Mir
7 billion, one nation, imagination...it's a beautiful day
 
MCIGuy
Posts: 1445
Joined: Sun Mar 26, 2006 8:15 am

RE: Crosswind Landing Wheel Alignment

Fri Mar 31, 2006 7:45 pm

Quoting EMBQA (Reply 1):
No. The only aircraft that can do that is the B-52.

Actually, the early C-5A Galaxy could do it too with it's massive undercarrriage. It was deemed too expensive to maintain though, so it was deleted in the B model and the A's were retrofitted with stationary gear.
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