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Joined: Tue Mar 23, 2004 3:30 am

B744 Landing: Flap Settings?

Sun May 23, 2004 3:56 am


When landing on a B744 last week I noticed just after touchdown that the two more inboard sets of leading edge flaps remained retracted for landing. The outermost set (outboard of engines 1+4) were extended.
Then as we were taxiing off the runway I noticed the previously retracted flaps moving out to their fully extended position, only to be retracted again before pulling on to stand!  Confused.
I have not seen this before in numerous commercial flights.

My question is, what was the reason? Is there an operational motive, or was it a technical malfunction, or even an error by the crew?

Thanks for any input,


So long 701, it was nice knowing you.
Posts: 3780
Joined: Tue Dec 30, 2003 5:30 am

RE: B744 Landing: Flap Settings?

Sun May 23, 2004 4:38 am

I believe they retract like that when thrust reverse is selected becase water spray freezing under the slats could pose a problem. Anyone else know for sure?

[Edited 2004-05-22 21:39:36]
Posts: 3371
Joined: Sun Mar 28, 2004 6:06 pm

RE: B744 Landing: Flap Settings?

Sun May 23, 2004 4:46 am

The leading edge devices were designed that way. Sorry no crew error or technical malfunction.

Mr. Boeing designed the devices to retract during reverse thrust to minimize the potential damage from foreign objects being blown into the leading edges.

That's it, plain and simple.
Fly fast, live slow
Posts: 928
Joined: Tue Mar 23, 2004 3:30 am

RE: B744 Landing: Flap Settings?

Mon May 24, 2004 5:43 pm

And there I was thinking I'd witnessed something extrordinary!!! Smile
Makes perfect sense when you think about it, my respect for aircraft manufacturers survives intact.

Thanks for the input, it's things like this that make this website - I could not have got a faster, more concise response if I had called boeing themselves!


So long 701, it was nice knowing you.

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