schizoidman@lemm.ee to World News@lemmy.worldEnglish · edit-21 month agoAt least 167 killed in plane crash at South Korea airportwww.bbc.comexternal-linkmessage-square11fedilinkarrow-up189arrow-down11file-text
arrow-up188arrow-down1external-linkAt least 167 killed in plane crash at South Korea airportwww.bbc.comschizoidman@lemm.ee to World News@lemmy.worldEnglish · edit-21 month agomessage-square11fedilinkfile-text
minus-squarehddsx@lemmy.calinkfedilinkEnglisharrow-up4·1 month agoI don’t think whatever electrical backup has enough power to deploy flaps at landing or near landing speeds.
minus-squarederanger@sh.itjust.workslinkfedilinkEnglisharrow-up3·edit-21 month ago737 NG alt flaps work up to 230 knots, well above landing speed. Landing with hydraulics out is the primary function of the alt flaps system. It’s really slow, however, so flaps 15 is typically the most they use.
minus-squarehddsx@lemmy.calinkfedilinkEnglisharrow-up1·1 month agoI didn’t find the speed rating for the alt flaps, but I was able to verify that it is an electrical system backup https://www.airliners.net/forum/viewtopic.php?t=1481455
minus-squarederanger@sh.itjust.workslinkfedilinkEnglisharrow-up1·edit-21 month agoThere’s a placard in the cockpit with flap speed limits.
I don’t think whatever electrical backup has enough power to deploy flaps at landing or near landing speeds.
737 NG alt flaps work up to 230 knots, well above landing speed. Landing with hydraulics out is the primary function of the alt flaps system. It’s really slow, however, so flaps 15 is typically the most they use.
I didn’t find the speed rating for the alt flaps, but I was able to verify that it is an electrical system backup
https://www.airliners.net/forum/viewtopic.php?t=1481455
There’s a placard in the cockpit with flap speed limits.