RyDawg82
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A300 Leading Edge Slats

Tue Oct 02, 2012 11:57 pm

I was curious about the A300 (all models) leading edge design and operation. While looking at the wing, the slat is essentially operated as one large slat that does not have the traditional "break" at the engine pylon. What I am curious about though is the part of the leading edge right where the wing joins the fuselage. From a distance, it appears that its a separate slat that slides down, but upon looking closer, it appears to be a Kruger flap. Does anyone have further information about how this flap operates? It simply doesn't resemble Kruger flaps commonly found on Boeing products. Does any one have any pictures or video of it in operation?

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2nd Question:

I can remember being at Stapleton Airport in the early 1990's and seeing Continental's A300s parked at the gate. These aircraft would have their slats down. I know the A300 has the option to just have the slats down (there are several topics on here about A300 No-Flap departures). Was this simply a CO company policy to leave them down to save wear and tear? Do other A300 operators do this? I cannot recall seeing a UPS or FedEx A300 with slats down on the ramp.

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Ryan
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dlednicer
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 5:28 am

Regarding question 1, the original A300B1 and A300B2 had a slat that ended inboard with a gap between it and the fuselage side:

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A Krueger flap was added inboard of this on the A300B2K and A300B4 to fill the gap and gain a little CLmax:

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They were also used on the A310:

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wilco737
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 1:28 pm

Quoting RyDawg82 (Thread starter):
I can remember being at Stapleton Airport in the early 1990's and seeing Continental's A300s parked at the gate. These aircraft would have their slats down. I know the A300 has the option to just have the slats down (there are several topics on here about A300 No-Flap departures). Was this simply a CO company policy to leave them down to save wear and tear? Do other A300 operators do this? I cannot recall seeing a UPS or FedEx A300 with slats down on the ramp.

LH did the same once they still had the A300's. I asked the pilots as well, why they do it. Rather simple answer: They needed it for landing and they need it for take off again, so they leave them extended. The A300 is rather big, so low chances or cars driving against it, like on smaller airplanes. And onle the slats extend and no trailing edge flaps, there is nothing in the way.

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longhauler
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 2:08 pm

It was policy at Wardair as well, on both the A300s and the A310s. I always thought we were the only ones that did it, but it now makes me think it was a recommendation from Airbus. We were told it was to reduce wear.

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Sancho99504
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 2:16 pm

I find it interesting that the A300/310 are the only large aircraft I have ever seen be able to takeoff with zero flaps. CA an someone explain this to me? Is it due to the design and chord of the wing that it generates an enormous amount of lift that flaps aren't needed for takeoff? Thanks
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Starlionblue
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 2:37 pm

Quoting sancho99504 (Reply 4):

I find it interesting that the A300/310 are the only large aircraft I have ever seen be able to takeoff with zero flaps. CA an someone explain this to me? Is it due to the design and chord of the wing that it generates an enormous amount of lift that flaps aren't needed for takeoff? Thanks

If memory serves, the wing performed better than expected. So an A300 can do it. However it depends on weight and runway length.
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imiakhtar
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RE: A300 Leading Edge Slats

Wed Oct 03, 2012 3:46 pm

Quoting Starlionblue (Reply 5):
If memory serves, the wing performed better than expected.

Correct. The A310s new wing exceeded performance requirements too. An excellent article on the A310s wing design available here:

Airbus Technical Digest - The Modern Wing of the A310 - 1985
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jetmech
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RE: A300 Leading Edge Slats

Thu Oct 04, 2012 11:40 pm

Quoting imiakhtar (Reply 6):

What a great publication! It's fascinating to actually learn something from reading such articles.

Regards, JetMech
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Fabo
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RE: A300 Leading Edge Slats

Fri Oct 05, 2012 12:46 am

I would say that many more aircraft would be able to do it, given that most flights, especially shorthaul, are way below runway limits... Some do, like Fokkers. However I think most are not even rigged for that, for ex. on the 737 there is no way to deploy slats without flaps.
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3rdGen
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RE: A300 Leading Edge Slats

Fri Oct 05, 2012 1:11 pm

Regarding the second question, its common practice on hot days to leave flaps out one notch to allow for some air flow around the wings in order to keep the fuel from overheating. But that's Houston in Feb, so maybe not, what you said may be correct, since they're going to go down one notch for the next departure, why not just leave them down, especially if they don't get in the way of the fuel bowser.

[Edited 2012-10-05 06:15:18]
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CCA
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RE: A300 Leading Edge Slats

Fri Oct 05, 2012 10:16 pm

Quoting 3rdGen (Reply 9):
fuel from overheating

???

I've never heard of that, there is an Airbus procedure to avoid nuisance "AIR L (R) WING LEAK" warnings when the OAT is above 30°C (86°F), which is done by leaving the flaps in CONF 1 after landing.
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3rdGen
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RE: A300 Leading Edge Slats

Sat Oct 06, 2012 10:08 am

Quoting CCA (Reply 10):

Thanks for the correction CCA, shows how much I know.
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