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Max Tailwind Limits  
User currently offlineJetman1115 From , joined Dec 1969, posts, RR:
Posted (13 years 10 months 3 weeks 5 days 20 hours ago) and read 4069 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.
Thanks all.

12 replies: All unread, jump to last
 
User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 29
Reply 1, posted (13 years 10 months 3 weeks 5 days 16 hours ago) and read 4001 times:

The 727 is 10kts per Boeing manual.

User currently offlineTOP From Germany, joined May 2000, 264 posts, RR: 0
Reply 2, posted (13 years 10 months 3 weeks 5 days 4 hours ago) and read 3978 times:

Hey,
the 747-400 has following wind limits:

Max. headwind, autoland 25 kts
AMx. tailwind, autoland 10 kts
Max. crosswind, autoland 25 kts
MAx. crosswind, autoland, one engine out 5 kts
Max. crosswind, take-off, manual landing 30 kts



User currently offlineL-188 From United States of America, joined Jul 1999, 29800 posts, RR: 58
Reply 3, posted (13 years 10 months 3 weeks 5 days 2 hours ago) and read 3952 times:

I think there are a couple of engines out there that can go in a stronger tailwind. But I don't have any numbers to back that up....Just a hunch.

I don't know if there is any specific problem with autopilots flying in tailwinds. But you can get into overtemp problems trying to start an engine with a breeze blowing up the pipe.

JETPILOT....Is that a start limit....

The reason I ask is that I was in the back of a 727-100 that landed in a 45KT tailwind. I don't belive that it was quartering at all but was running straight and true down the runway.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineTOP From Germany, joined May 2000, 264 posts, RR: 0
Reply 4, posted (13 years 10 months 3 weeks 5 days ago) and read 3943 times:

This data I've from the 747-400 manual...

User currently offlineDnalor From Australia, joined Mar 2000, 369 posts, RR: 0
Reply 5, posted (13 years 10 months 3 weeks 4 days 23 hours ago) and read 3932 times:

Why would a pilot land with a 45 knot tail wind when by coming in the other way they could easily take 20 knots off their approach ground speed using the head wind????

The touch down speed would be horrendous! as in 45 knots + the approach airspeed + margin for windshear, just ask Prince Charles about the Bea 146 he wrecked in the same manner!


User currently offlineL-188 From United States of America, joined Jul 1999, 29800 posts, RR: 58
Reply 6, posted (13 years 10 months 3 weeks 4 days 14 hours ago) and read 3920 times:

The dogleg final around a 3500 foot mountain had a lot to do with it. That and all of the turbulence comming off of that hill.


OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
User currently offlineDnalor From Australia, joined Mar 2000, 369 posts, RR: 0
Reply 7, posted (13 years 10 months 3 weeks 4 days 11 hours ago) and read 3911 times:

Thought you'd answer that*L*

cheers


User currently offlineGalaxy5 From United States of America, joined Mar 2000, 2034 posts, RR: 24
Reply 8, posted (13 years 10 months 3 weeks 4 days 3 hours ago) and read 3901 times:

the C-5 has a max operating wind limits as follows:

max tail wind 13 kts
max headwind 50 kts
max crosswind 35 kts



"damn, I didnt know prince could Ball like that" - Charlie Murphy
User currently offlineAmbasaid From , joined Dec 1969, posts, RR:
Reply 9, posted (13 years 10 months 2 weeks 2 days 5 hours ago) and read 3861 times:

B747-400
B777-200

Max Tailwind 15 kts thanks to a SCN on offer from Boeing.

(SCN = Specification Change Note otherwise known as an Option.)


User currently offlineKohflot From , joined Dec 1969, posts, RR:
Reply 10, posted (13 years 10 months 1 week 5 days 22 hours ago) and read 3823 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.

User currently offlineMD11Nut From , joined Dec 1969, posts, RR:
Reply 11, posted (13 years 10 months 1 day 18 hours ago) and read 3798 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.

Best Regards,
Nut



User currently offlineL-188 From United States of America, joined Jul 1999, 29800 posts, RR: 58
Reply 12, posted (13 years 10 months 1 day 6 hours ago) and read 3787 times:

I know that they brought the MD-90 prototype out to CDB during March of 1996 to do crosswind testing out there.

Unfortunatly they didn't tell anybody else. I was out of state on an spotting trip when they where there. Heard about it when I got back though.



OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
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