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747 On Landing

Rendezvous From New Zealand, joined May 2001, 499 posts, RR: 0
Posted (11 years 11 months 2 days 10 hours ago) and read 973 times:

While spotting today I noticed that the leading edge flaps inboard of the outer engines on the 747 retract on landing. I was wondering why this happens.

~Rdz

5 replies: All unread, jump to last

VC-10 From United Kingdom, joined Oct 1999, 3677 posts, RR: 37
Reply 1, posted (11 years 11 months 2 days 10 hours ago) and read 909 times:

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It's a throw back to when turbine reversers were fitted. It was to prevent FOD damage in that area. I am surprised to hear there are still a/c around with that system still operative.

Rendezvous From New Zealand, joined May 2001, 499 posts, RR: 0
Reply 2, posted (11 years 11 months 2 days 9 hours ago) and read 896 times:

Really? I saw several 747-400 aircraft doing this...

VC-10 From United Kingdom, joined Oct 1999, 3677 posts, RR: 37
Reply 3, posted (11 years 11 months 2 days 9 hours ago) and read 893 times:

Ah.............we are talking -400, I was talking Classic. The reason for the operation is the same however.

Air2gxs From , joined Dec 1969, posts, RR:
Reply 4, posted (11 years 11 months 7 hours ago) and read 815 times:

Yeah, I'm suprised any classic still has them. Every airplane we took out of the desert we de-activated that function.

I really thought it was an industry-wide, fleet-wide effort.

Cx flyboy From Hong Kong, joined Dec 1999, 6338 posts, RR: 56
Reply 5, posted (11 years 11 months 5 hours ago) and read 818 times:

We have that on our 747-400s when the thrust reversers are used. The indication in the cockpit is that the flap position indicator on the screen changes from green to magenta, and a few seconds after the reversers are closed, the indication goes back to green again as the leading edge reconfigures back to whatever the flap lever position is at.