SJC-Alien
Topic Author
Posts: 870
Joined: Wed Jul 14, 1999 1:15 pm

X-wind, White Line And Setting Straight

Mon May 22, 2000 5:12 am

I showed a photo I took of an AirNew Zealand 747-200 landing on runway 06L at LAX in 1990 to someone that supposedly knows aircraft operations. In the photo, due to a strong x-wind from the south, the 747 had landed slightly off center to the right of the pavement, and was 'crab-ed' with the nose to the right off centerline to about, hmmm what I'd say about, 10-12 degrees off center, but I'm no expert.
The friend said that the pilot can get in serious trouble from Airline management for being off center so much, and 'crab-ed' over that far. I said it was on the runway and in one piece, what did it matter. He said the plane could have gone off the runway. I figured the pilot would just kick the rudder after touchdown and straighten it out. I need a clue...whats the normal proceedure on placement on the runway...windy or not?

THX
SJC Alien
 
landgreen
Posts: 36
Joined: Wed Jun 30, 1999 9:31 am

RE: X-wind, White Line And Setting Straight

Mon May 22, 2000 5:55 am

I'm not sure about the 747 in particular, but coming from an operations person myself, the proper crosswind landing technique is to eliminate the crab prior to touchdown. This can be done either in the flare or as our manuals say for the DC-9 A319/320 B767 can be done below 300ft AGL. On wet or slippery runways they advise to land nose slightly upwind of the centerline and touchdown with crab remaining. After you have seen a number of crosswind landings you will see that they are not all executed perfectly and on centerline.
 
Guest

RE: X-wind, White Line And Setting Straight

Mon May 22, 2000 6:52 am

The 747 undercarriage is designed to enable the aircraft to touch down crabbed by quite a serious number of degrees. I understand that if a wing is kept low to counteract a crosswind on a 747, the engines risk grounding, so the aircraft is crabbed and kicked straight after touchdown.



 
Guest

RE: X-wind, White Line And Setting Straight

Mon May 22, 2000 1:19 pm

In my experience, aircraft watching, and little reading, the most used "style" if you want to call it, is on final approach on a crab angle and when at the PIC's(pilot-in-command's) discretion, touchdown with the airplane on a slip (aligning the airplane with the runway), the main landing gear which the wind is coming from is first to kiss mother earth then the other and nose wheel last, keep aileron pressure to the side wind is coming from, all the way until the aircraft clears the runway. On the slip the PIC keeps airplane at that bank angle with ailerons while using opposite rudder input. At first is uncomfortable but when you get it, it's sweet.
Like said before the 747 is designed to tolerate landings AT the crab angle, because landing on a slip with too much bank angle will not be good for the engine's health or the pilot's status. I don't remember clearly but some airplane's main gear (one) moves to compensate the crab angle (somewhat aligns with the runway).
 
SJC-Alien
Topic Author
Posts: 870
Joined: Wed Jul 14, 1999 1:15 pm

X-wind, White Line And Setting Straight

Mon May 22, 2000 2:26 pm

Yes,,good addition, I have seen this on 747 at LAX before and after this event, now that you mention it. Though the 727 are famous for X-wind landings, the 747 do seem to have a tough time of it, and I've seen and filmed some pretty rough landings at LAX, because we can see the airport at a different angle than say, SFO.

I'm just glad it isn't me flying that puppy.!! Total repect here, boys and girls.

SJC Alien
 
Guest

RE: X-wind, White Line And Setting Straight

Tue May 23, 2000 5:51 am

Check out this site for a some spectacular 747 landings.

http://www.aviationpics.de/app/app.htm
 
Panman
Posts: 603
Joined: Mon Aug 09, 1999 8:25 pm

RE: X-wind, White Line And Setting Straight

Tue May 23, 2000 6:07 am

This way is easier than cutting and pasting.

Click on the link etc.

http://www.aviationpics.de/app/app.htm

PANmaN
 
Guest

RE: X-wind, White Line And Setting Straight

Wed May 24, 2000 4:43 am

Thanks for that, I've not included a link before. Know now though.

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