blck, а какой должен быть метар, чтобы обливаться? Обязательно ли чтобы были указаны осадки?
Нет, не обязательно, если на крыле есть хоть сколько льда, или температура в районе около 0, при этом видимость не "без ограничений" - то есть есть чему конденсироваться.
Вот что пишет Аэробус на эту тему
Icing conditions on the ground can be expected when air temperatures fall below freezing
and when moisture or ice occurs in the form of either precipitation or condensation.
Precipitation may be rain, sleet or snow. Frost can occur due to the condensation of fog or
mist. Frost occurs systematically when OAT is negative and sky is clear overnight.
To these weather conditions must be added further phenomena that can also result in
aircraft ice accretion on the ground:
Aircraft-related conditions
The concept of icing is commonly associated only with exposure to inclement weather.
However, even if the OAT is above freezing point, ice or frost can form if the aircraft
structure temperature is below 0° C (32° F) and moisture or relatively high humidity is
present.
With rain or drizzle falling on sub-zero structure, a clear ice layer can form on the wing
upper surfaces when the aircraft is on the ground. In most cases this is accompanied by
frost on the underwing surface