deploying de-icing boots

[El Bucho]

On the Mu2 there is an AD that in icing conditions you must hand-fly the aircraft and the boots placed in the auto mode. I think the auto mode blows the boots like once every 2 or 3 minutes. When to hit the switch will probabloy be debated until the cows come home. I've had the ice bridge the boots both ways whether I let it build up first or turn them on right away. The Mu2 has had extensive tests for icing. Flying behind the tanker and everything and I guess they found that even if the first cycle doesn't get it off, subsequent cycles will remove the ice most of the time.