Guest

Max Tailwind Limits

Sat Nov 04, 2000 4:24 am

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.
 
JETPILOT
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Max Tailwind Limits

Sat Nov 04, 2000 8:35 am

The 727 is 10kts per Boeing manual.
 
TOP
Posts: 250
Joined: Wed May 10, 2000 5:22 am

RE: Max Tailwind Limits

Sat Nov 04, 2000 8:04 pm

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

 
L-188
Posts: 29881
Joined: Wed Jul 07, 1999 11:27 am

RE: Max Tailwind Limits

Sat Nov 04, 2000 10:40 pm

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.
 
TOP
Posts: 250
Joined: Wed May 10, 2000 5:22 am

RE: Max Tailwind Limits

Sun Nov 05, 2000 12:18 am

This data I've from the 747-400 manual...
 
dnalor
Posts: 346
Joined: Fri Mar 10, 2000 7:58 pm

RE:L-188

Sun Nov 05, 2000 1:30 am

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!
 
L-188
Posts: 29881
Joined: Wed Jul 07, 1999 11:27 am

RE: Max Tailwind Limits

Sun Nov 05, 2000 10:14 am

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.
 
dnalor
Posts: 346
Joined: Fri Mar 10, 2000 7:58 pm

RE: Max Tailwind Limits

Sun Nov 05, 2000 1:28 pm

Thought you'd answer that*L*

cheers
 
galaxy5
Posts: 1952
Joined: Sat Mar 18, 2000 10:09 pm

RE: Max Tailwind Limits

Sun Nov 05, 2000 9:44 pm

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
 
Guest

RE: Max Tailwind Limits

Tue Nov 14, 2000 7:35 pm

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.)
 
Kohflot
Posts: 941
Joined: Wed Sep 29, 1999 5:31 am

TOP

Sat Nov 18, 2000 2:29 am

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.
Ask why..
 
Guest

RE: Autoland Wind Limits

Wed Nov 29, 2000 6:14 am

****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

 
L-188
Posts: 29881
Joined: Wed Jul 07, 1999 11:27 am

RE: Max Tailwind Limits

Wed Nov 29, 2000 6:57 pm

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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