DH106
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A380 Gear Doors - Missing Fillet

Tue Dec 13, 2005 11:11 pm

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
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CCA
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RE: A380 Gear Doors - Missing Fillet

Wed Dec 14, 2005 10:22 am

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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DH106
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RE: A380 Gear Doors - Missing Fillet

Wed Dec 14, 2005 7:35 pm

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
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HAWK21M
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RE: A380 Gear Doors - Missing Fillet

Wed Dec 14, 2005 10:31 pm

Fantastic Pics.Amazing what one can learn every day.
Any closeup videos on the LG retraction/extension sequence.
regds
MEL
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DH106
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RE: A380 Gear Doors - Missing Fillet

Wed Dec 14, 2005 11:15 pm

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]
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meister808
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RE: A380 Gear Doors - Missing Fillet

Thu Dec 15, 2005 4:58 am

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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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.

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Starlionblue
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RE: A380 Gear Doors - Missing Fillet

Thu Dec 15, 2005 8:35 am

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
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Slcpilot
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RE: A380 Gear Doors - Missing Fillet

Thu Dec 15, 2005 2:19 pm

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]
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