The Industry uses oat below +10 since pal
mnair 737 accident at Washington.At that time My Co' used to use below+8 on the DC8/9's.After the accident the industry and FAA directed the use below +10 with visable Moisture present.
As capsiar says keep an eye on temp changes on descent especially when one 'slows' up at FL100(10000 in north Amer')the reduced airflow allows the wing to cool off into the required heat range.
The danger of using it above +10,on the ground was the lack of airflow cooling could poss' lead to o'temp warping of the plumbing around the engine nacelle leading edge..
