|Quoting Starlionblue (Reply 3):|
If we define "crazy" as "beyond regulatory and operator limits" then yes, they are barred.
Quoting kimon (Reply 2):
For T/O no problem if crazy windy?
There are three different kinds of limitations on aircraft operation. In the US at least, adherence to each is required by Federal law.
One is the limits of the crew. If my skills, and perhaps my alertness after a long flight, are only up to a 20-knot crosswind component, then I must be aware of that. I fly under part 91, and 91.103 states, "Each pilot in command shall, before beginning a flight, become familiar with all available information concerning that flight." Part 121 and Part 135 operators have similar statements included in their approved operation manuals. This is a catch-all but it includes knowing the current and forecast winds at the destination and any alternate and knowing if the runways available will lie within my crosswind limits.
Another is the limitations of the airframe. FAR
Parts 23 and 25 cover the design requirements for airplanes in the normal and transport categories, but neither says anything about a maximum crosswind. Even the maximum operating airspeed is loosely defined as a function of demonstrated load capabilities on airframe components. It does specify that the airplane must come with operating instructions, and for normal category airplanes, this includes a maximum demonstrated crosswind component. It has very little to do with the capabilities or limitations of the airplane though, and is not considered a limitation. It is usually just the best crosswind that was available on the day the test was performed, and since it was demonstrated, it's included in the operating instructions. It is a piece of information that the pilot must become familiar with, but the crosswind in which a plane might land could be greater or lesser than this number, depending on the other sets of limitations.
The last set of limitations is the kind imposed by law. In the US (and most other places) there is no absolute limit on crosswinds, or any other kind of winds. The legal limitations usually just require adherence to other kinds of limitations, and that means failing to adhere to them becomes a violation of law, not just poor operating practice. The limitations imposed by Part 121/135 operation manuals are almost always far stricter than the generic limitations under the law, although those manuals become enforceable by the same laws.
In summary, the primary limitation is usually the ability of the pilot him or herself to know and understand his or her own capabilities and those of the airplane, and ensure the flight remains within those limits at all times. There are no speed limit signs on the side of the runway indicating the maximum crosswind permitted for landing. I think it could be misleading to say "operation in crazy winds is barred" without any further explanation.