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happyvanchai
15th Jun 2006, 07:35
I would like to know the cross-wind tolerance of common jet airliners.(e.g. B747, B777, A320, A330, A340, MD11, etc.) Can someone give me the information?:)

Mad (Flt) Scientist
15th Jun 2006, 07:44
The regulatory minimum which must be demonstrated is between 20 and 25 knots (dependent upon the characteristics of the specific aircraft).

[that's per FAR25.237 - usual caveat as to variation in regs between authorities and with time, of course]

In order to minimize the impact on operations, most manufacturers will try to get somewhat more - even if we find that our highest 'demonstrated' crosswind didn't appear to be limiting, some operators or authorities may conservatively take the highest demonstrated condition as a limit, so it pays to do the best you can, within the limits of the test scheduling.

I'd say that most programmes would target 30kts, but would certainly go for more if they happened to get it, and won't waste an inordinate amount of test time trying to get 30kts if they already had, say, 28kts. So if you were to say ballpark 30-35kts demonstrated for most types, with the likely 'real' limit being somewhat higher, you won't be too far wrong.

omnidirectional737
15th Jun 2006, 09:39
On my company 737-800 Dry landing 40 knots, take off 36 knots. wet landing 40 knots, take off 27 knots.

captjns
15th Jun 2006, 15:19
Here is an excerpt from an AOM from a 737-800 operator

Crosswind Limitations
Dry - 35 kts
Wet - 30 kts

Note: Limits reduce by 1 kt/metre for runway widths less than 45 metres.
Gusts must be factored as follows:
- 50% of the total gust plus the mean crosswind component value
- the sum of the value (above) must not exceed crosswind limitation.

captjns
15th Jun 2006, 15:24
Here is one from the Boeing AFM regarding the Boeing 747-400

The maximum takeoff and landing crosswind is 30 knots (not limiting).


Each carrier may impose their own limitation for operations purposes.

Best foot forward
15th Jun 2006, 16:44
B757 is 40kts.

A few acft i have flown have had max demonstrated crosswind figures which is were the non limiting comment comes from.

happyvanchai
19th Jun 2006, 06:46
Thanks for the information:D