Cirrus also offers an approved (FIKI) version. It features a sprayer designed to keep ice from forming in the pilot's field of view. This airplane had just returned from a trip up through 4,000 feet of icy cloud and back down again. It returned with nearly an inch of mixed ice on the unprotected areas of the airplane. But the pilot could still see out for landing. Much of the ice seen here, let me point out, built up with the TKS system powered off, as the pilot was looking to see how fast the ice was forming. The answer: too fast for a non-protected airplane. On descent, the pilot reactivated the system, which shed much of the ice on the flying surfaces.