Jetman1115 From , joined Dec 1969, posts, RR: Posted (14 years 4 months 4 days 22 hours ago) and read 4569 times:
I work in a large charter department and a question came up in our Initial Indoctrination class. Our company ops manuel says no operations (takeoff or landings) with a tailwind of more than 10 kts. Are there any aircraft out there that have a max tailwind limit of more than 10 knots for takeoff and landing? None of our aircraft do.
MD11Nut From , joined Dec 1969, posts, RR:
Reply 11, posted (14 years 3 months 1 week 2 days 20 hours ago) and read 4298 times:
****Why does the 744 have a max autoland headwind component of 25kts? Just in case there's shear or somethin? I've just never seen a plane have a max headwind component.. autoland or no.*****
Per FAA regulations, the aircraft operation in winds has to be demonstrated (i.e. == flight tested) to at least 150% of the winds (cross and tail/head winds) for which credit is sought. For the above example, in order to have a 25knts limit, the aircraft must have been exposed to 37.5 knts headwind. Regardless of aircraft/autoland actual performance, it is pretty tough to find that kind of winds to demonstrate your system on, especially when the flight testers only have a window of 1 or 2 weeks. The test crew literally would have to fly all over the country to find the right winds at airports that are not too busy to allow you to do multiple go-arounds/landings and not make you wait hours for your turn.