There's a question (OK, 2) I wonder if those on here can answer.
1) I undertsnd that skin temperature is calculated from OAT and Mach number. Why wasn't it simply measured directly by sensors on the nose skin?
2) The Air Data Computer calculates Mach (so skin temp is a calculation on a calculation!). Presumably one parameter it uses is IAS. What else is used in the calculation of Mach?