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A380 Gear Doors - Missing Fillet  
User currently offlineDH106 From United Kingdom, joined Jun 2005, 626 posts, RR: 1
Posted (8 years 9 months 1 week 3 days 5 hours ago) and read 3340 times:

I've asked this before but didn't get an proper answer + no search result.

On the A380's wing gear inner doors (under the fuz), there's a fillet at the rear edge that 'disappears' then the doors open during retraction. Does this fillet retract inwards or something - anyone know ?

Take a look at these two shots for a comparison of the door closed and open - the fillet is clearly visible in the closed shot.

Closed


Open



...I watched c-beams glitter in the dark near the Tanhauser Gate....
7 replies: All unread, jump to last
 
User currently offlineCCA From Hong Kong, joined Oct 2002, 836 posts, RR: 14
Reply 1, posted (8 years 9 months 1 week 2 days 18 hours ago) and read 3208 times:

I see what you mean, I think it fold inwards the reason being that if it we're part of the door it would foul with the body gear when the doors opened.

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Photo © Michael Vaeremans
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Photo © Bernard Charles




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User currently offlineDH106 From United Kingdom, joined Jun 2005, 626 posts, RR: 1
Reply 2, posted (8 years 9 months 1 week 2 days 9 hours ago) and read 3119 times:

Good piccies - thanks CCA

Yes - it's clearly there to stop the door fouling on the forward wheels of the body gear.

Interesting to note the folded cutouts in the body gear doors also. It's almost as if Airbus designed the gears and doors as a unit, and then suddenly realised at assembly test stage that the doors wouldn't open with the various bogie angles for ground/air and had to come along with a hacksaw and make these little fillets  Wink



...I watched c-beams glitter in the dark near the Tanhauser Gate....
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 3, posted (8 years 9 months 1 week 2 days 6 hours ago) and read 3087 times:

Fantastic Pics.Amazing what one can learn every day.
Any closeup videos on the LG retraction/extension sequence.
regds
MEL



Think of the brighter side!
User currently offlineDH106 From United Kingdom, joined Jun 2005, 626 posts, RR: 1
Reply 4, posted (8 years 9 months 1 week 2 days 5 hours ago) and read 3072 times:

Quoting HAWK21M (Reply 3):
Any closeup videos on the LG retraction/extension sequence

The retraction sequence is contained in video clip on the Airbus site, here:-

http://www.airbus.com/store/photolibrary/AIRCRAFT/AIRBUS/A380/video/att00004382/best_of_2mn_lrg.wmv

Unfortunately, the angle it's shot at doesn't allow the viewing of the above fillet during retraction.

[Edited 2005-12-14 15:21:55]

[Edited 2005-12-14 15:22:41]


...I watched c-beams glitter in the dark near the Tanhauser Gate....
User currently offlineMeister808 From United States of America, joined Jan 2000, 973 posts, RR: 1
Reply 5, posted (8 years 9 months 1 week 2 days ago) and read 3006 times:

It seems to me that they really paid too much attention to getting the fueslage underside cleaned up with the gear down... looking at this pic:


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Click here for bigger photo!

Photo © Bernard Charles



it looks like the bottom is closed up to a high degree... there is nothing wrong with having a door or 2 hanging when the gear are down - the drag savings has to be minimal compared to the drag that is imparted by the extended landing gear.

I understand that every bit counts, but you also have to look at each additional complication as something else that is going to break.

-Meister



Twin Cessna 812 Victor, Minneapolis Center, we observe your operation in the immediate vicinity of extreme precipitation
User currently offlineStarlionblue From Greenland, joined Feb 2004, 17039 posts, RR: 66
Reply 6, posted (8 years 9 months 1 week 1 day 20 hours ago) and read 2946 times:

Quoting Meister808 (Reply 5):

I understand that every bit counts, but you also have to look at each additional complication as something else that is going to break.

I bet one of the 26 coffemakers on board will break first Big grin



"There are no stupid questions, but there are a lot of inquisitive idiots."
User currently offlineSLCPilot From United States of America, joined Aug 2003, 585 posts, RR: 2
Reply 7, posted (8 years 9 months 1 week 1 day 14 hours ago) and read 2902 times:

Meister808,

Here are some other things to consider.

1) Noise - believe it or not, gear wells (and the gear themselves) are a major contributor to noise during the appr. phase. There was an article in AW&ST a couple of years ago with respect to the Airbus's efforts to reduce this noise.

A few years ago a friend of mine was shocked when I identified his plane flying in the pattern behind me without turning around. For those of you into GA airplanes, you can always recognize the whistle of a Piper Arrow with the gear down, it's very distinctive.

2) Weight - How can gear doors affect weight you wonder? Well, they keep the gear wells cleaner. By keeping dirt/grime/snow/ice etc. from being sprayed up into the well, you reduce the aircraft gross weight. It all adds up, especially over time. Older aircraft weigh more.

3) Reliability - this is really related to the above reason. The more you keep "crap" out of the wells, the more reliable the whole gear door sequencing is going to be. Can you imagine the cost of coming back to the field because the doors won't/can't close? It's not cheap. By the time you dump fuel (not free these days) to get down to your max landing weight, you've already inconvienced quite a few people, both those on the plane, and those at the destination waiting for the next flight. A very little problem can cost an airline quite a few $$$$$$.


I hope these ideas help. I'm not an engineer, they get paid the money to consider these things.

I just move the gear and the flaps for the Capn... "Gear up, flaps up, shut up. And you get the ugly one".
TIC.

SLCPilot


PS> And to the thread starter, this thread is more interesting than I would have guessed, thank you.

[Edited 2005-12-15 06:39:55]

[Edited 2005-12-15 06:41:53]


I don't like to be fueled by anger, I don't like to be fooled by lust...
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