pjac
To put my twopence worth in, in Eagle-we used the +12 to 0 for B Skin jets before entering precipitation areas. The thinking was that in turning the corner (in the intake), the air temp would drop to the +5 to -5 range. You may recall with the adverse weather systems, we used the letters, HELP being Horn Balance, Electric windshield heat (incresing), Leading edge and Propellor deicing. These were turned on automatically with by the ice sensor.