UPSMD11 From United States of America, joined May 2003, 799 posts, RR: 4 Posted (7 years 5 months 2 weeks 5 days 10 hours ago) and read 3705 times:
I have been standing in the G concourse at ORD today for about 2 hours and I have seen many of the international arrivals come in including 744 from KLM and Lufthansa. I noticed on the KLM 744 that the slats stayed out during the thrust reverse but the Lufthansa slats retracted as I have read they do on this forum in the past.
Is this something that the flight crew can select as part of the landing configuration or something the airline selects as part of their SOP?
Qantas744ER From United States of America, joined Jun 2005, 1269 posts, RR: 4 Reply 1, posted (7 years 5 months 2 weeks 5 days 8 hours ago) and read 3667 times:
Not quite right, on landing, when the thrust reversers are active, the slats will retract so that they will not be damaged by dirt etc. that can be thrown around the air by the T/R as soon as the T/R is deactivated again, the slats will extend again. So i think you saw something wrong there.
The normal landing flaps settings are Flaps 25 and 30, and none of these have the option of slat retraction without using T/R.
N8076U From United States of America, joined Jun 2006, 425 posts, RR: 9 Reply 4, posted (7 years 5 months 2 weeks 4 days 5 hours ago) and read 3459 times:
Quoting 113312 (Reply 3): On B747s, they are actually variable camber LE Flaps.
The composite LE flap panels that are exposed from the bottom of the wing while they are retracted lay flat when in that stowed position. When deployed, the mechanisms the panels are attached to not only swing them down and forward, but also put a bow into them.
I think he was just trying to add to the technical content of the post by pointing out that they are in fact "variable camber", rather than the more standard fixed camber variety of "LE flaps", as it is a unique design characteristic of the 747 compared to other Boeing jetliners.