Does not certification with and without a powered horizontal stabilizer/flight controls have some bearing on whether the stabilizer is de-iced or anti-iced protected? The MD80 has non powered stabilizer and it is deiced, the 737 has a powered stabilizer and has no ice protection. The corporate Challenger I flew had powered surfaces and it was not deiced, the unpowered Westwind was (I think, but that was a long time ago).